SOPM20-50-11空气动力学平滑密封胶的应用

空气动力学平滑密封胶的应用APPLICATION OF AERODYNAMIC SMOOTHING SEALANT

1. INTRODUCTION 介绍

A. The data in this subject comes from Boeing Process Specification BAC5030. Access to the Boeing Process Specifications is available.

本主题中的数据来自波音工艺规范 BAC5030。可访问波音工艺规范。

B. The data is general. It is not about all situations or specific installations. Use this data to help you write minimum requirements.

数据为通用数据。不适用于所有情况或特定安装。使用这些数据来帮助您编写最低要求。

C. Refer to SOPM 20-00-00 for a list of all the vendor names and addresses.

供应商名称和地址列表请参考SOPM 20-00-00。

2. DEFINITIONS 定义

A. Application time: The length of time after two-part sealants are mixed, or after premixed frozen sealant is thawed, during which the sealant can be applied and smoothed. The end of application time is when the sealant flow rate is less than 30 grams in a minute when pushed out at 90 psi through an opening that is approximately 1/8 inch (3 mm) in diameter (such as a Semco Model 440 nozzle) at standard test conditions. Application time will be different at other temperatures and humidities.

适用时间:双组分密封胶混合后或预混合的冷冻密封胶解冻后的可用时间,在此期间密封胶可以涂抹并抹平。在标准测试条件下,当密封胶以90 psi的压力从直径约1/8英寸(3毫米)的开口(如Semco 440型喷嘴)挤出时,每分钟流出量少于30克时,即为涂抹时间结束。在其他温度和湿度下,涂抹时间会有所不同。

B. Composite edge: An edge where a composite material is cut to show the edges of the plies.

复合边缘:切割复合材料以显示层状边缘的边缘。

C. Cure time: The time for the sealant to get to a hardness of 25-30 when measured on an ASTM D2240 Type A durometer. This is not a full cure, but it is sufficient to let other work be done in the area without risk of damage to the sealant.

固化时间:根据ASTM D2240 A型硬度计测量,密封胶达到25-30硬度的时间。这还不是完全固化,但足以让该区域的其他工作顺利进行,而没有损坏密封胶的风险。

D. Dishing: When sealant shrinks and gives a concave (indented) or dished appearance.

凹陷:密封胶收缩后呈现凹面(凹痕)或凹陷状。

E. Injection kit: A sealant kit in which the base compound is stored in a plastic cartridge and the accelerator is stored in a tubular dasher rod with a piston rod and valve. The piston pushes the accelerator into the base compound. Then the base compound and accelerator are hand mixed or machine mixed inside the plastic cartridge.

注射工具:密封胶工具,其中基础化合物储存在塑料筒中,促进剂储存在带有活塞杆和阀门的管状搅拌棒中。活塞将促进剂压入基础化合物中。然后,在塑料筒内手动或机器混合基础化合物和促进剂。

F. Metal foil: Titanium or stainless steel foil approximately 1-5 mils (0.001-0.005 inch or 0.0254-0.1270 mm) thick, installed on composite edges to give rain erosion protection.

金属箔:钛或不锈钢箔,厚度约为1-5密耳(0.001-0.005英寸或0.0254-0.1270毫米),安装在复合边缘上,以防止雨水侵蚀。

G. Premixed frozen sealant (PMF): Sealant base compound and accelerator that are mixed together, packaged in containers and frozen for storage.

预混合冷冻密封胶(PMF):密封胶基料和促进剂混合在一起,包装在容器中冷冻储存。

H. Room temperature: 70-85°F (21-29°C).

室温:70-85°F(21-29°C)。

I. Scarf: A procedure used to cut away bad or cured sealant. The sealant is cut away at an angle to give a larger surface area for a better bond with new sealant.

刮刀:用于切除不良或固化密封胶的程序。密封胶以一定角度切除,以增大表面积,从而更好地与新的密封胶粘合。

J. Standard test conditions: 72-82°F or 22-28°C and 45-50% relative humidity.

标准测试条件:72-82°F或22-28°C,相对湿度45-50%。

K. Tack free time: The time at which the sealant will not transfer to polyethylene film or a bare knuckle.

粘性消失时间:密封胶不再粘附在聚乙烯薄膜或裸露的转向节上的时间。

3. MATERIALS 材料

A. Sealants (SOPM 20-60-04)

密封胶(SOPM 20-60-04)

(1) BMS 5-45, Class B dark gray

(2) BMS 5-95, Class B

(3) BMS 5-142, Class B

(4) BMS 5-175, Type 1, Class B-1/2 or B-2 (Silicone)

(5) Dow Corning 93-006-1 and 93-006-6 (Silicone) (New supply is not available)

(6) PR 1826, Class B-1/2 and B-1/4 (with primer) (dark gray)

(7) PR 1828, Class B-1/2 and B-1/4 (white)

(8) PR-2001, Class B-2

B. Adhesion Promoters

粘合促进剂

(1) PR-187

(2) PR-188

(3) PR-1826 (packaged with PR-1826 sealant)

C. Primer — Dow Corning PR-1200 (Replaces DC 1200) (Red) (SOPM 20-60-04)

底漆——道康宁 PR-1200(替代 DC 1200)(红色)(SOPM 20-60-04)

D. Solvents and Cleaners (SOPM 20-60-01)

溶剂和清洁剂(SOPM 20-60-01)

(1) Acetone: ASTM D329 or JIS-K-1503

丙酮:ASTM D329 或 JIS-K-1503

(2) Aliphatic Naphtha: TT-N-95, Type 2 or ASTM D3735, Type 1

脂肪族石脑油:TT-N-95,类型2或ASTM D3735,类型1

(3) BMS 11-7

(4) Methyl Ethyl Ketone (MEK): JIS-K-1524 or ASTM D740

甲基乙基酮(MEK):JIS-K-1524或ASTM D740

(5) sec-Butyl alcohol: ASTM D1007

仲丁醇:ASTM D1007

(6) MEK and sec-Butyl alcohol mix (by volume):

甲基乙基酮和仲丁醇混合物(按体积):

(a) 40-44 percent MEK

40-44%的甲基乙基酮

(b) 56-60 percent sec-Butyl alcohol

56-60%的仲丁醇

(7) FCC-55

(8) Citra-Safe

(9) Isopropyl alcohol (IPA)

异丙醇(IPA)

(a) ASTM D770 (Replaces TT-I-735, Grade A or B)

ASTM D770(取代TT-I-735,A级或B级)

(b) HG/T 2892 (99.7 percent analytically pure)

HG/T 2892(分析纯度为99.7%)

(10) Finishing Solution: 100 percent deionized or distilled water, or 100 percent isopropyl alcohol, or a mixture of these two components in all proportions.

抛光液:100%去离子水或蒸馏水,或100%异丙醇,或这两种成分按任意比例混合而成的溶液。

E. Wipers — BMS 15-5, Class A (SOPM 20-60-04)

刷子——BMS 15-5,A级(SOPM 20-60-04)

4. SEALANT DESCRIPTIONS 密封胶描述

A. BMS 5-45, Class B Sealant

BMS 5-45,B级密封胶

(1) The different classes give you a selection of different application and cure times. These times are approximate.

不同等级的密封胶为您选择不同的应用和固化时间。这些时间均为近似值。

(2) The applied sealant will cure to ASTM D2240 Type A durometer hardness of 25 minimum at 72-82°F (22-28°C) and 45-55% relative humidity. Lower temperatures and humidities will make the cure time longer. Higher temperatures will make the reaction faster and make the cure time shorter.

在 72-82°F (22-28°C) 和 45-55% 相对湿度下,涂抹的密封胶固化后,ASTM D2240 A 类型硬度计测量的硬度至少为 25。温度和湿度越低,固化时间越长。温度越高,反应越快,固化时间越短。

(3) Usual application time can be extended by refrigerated storage immediately after the mix. Once removed and thawed, sealant must not be refrigerated again. Shelf life of activated compounds, if not quick-frozen, is 7 days maximum at -20°F (-29°C) or colder, or 21 days at -40°F (-40°C) or colder. If quick-frozen, refrigerated storage of activated sealant is 7 days maximum at -20°F (-29°C) or colder, or 42 days at -40°F (-40°C) or colder.

混合后立即冷藏，可延长通常的应用时间（使用时间）。取出并解冻后,密封胶不得再次冷藏。未快速冷冻的活性化合物在-20°F(-29°C)或更低温度下的保质期最长为7天,在-40°F(-40°C)或更低温度下的保质期最长为21天。如果快速冷冻,活性密封剂的冷藏储存期限为:在-20°F(-29°C)或更低温度下最多7天,在-40°F(-40°C)或更低温度下最多42天。

(4) Shelf life of BMS 5-45 sealant is 6 months at 40-90°F (4-32°C).

BMS 5-45密封剂的保质期为6个月,温度为40-90°F(4-32°C)。

B. BMS 5-95, Class B Sealant

BMS 5-95,B级密封胶

(1) The different classes give you a selection of different application and cure times. These times are approximate.

不同等级的密封胶为您选择不同的应用和固化时间。这些时间均为近似值。

(2) The applied sealant will cure to ASTM D2240 Type A durometer hardness of 30 minimum at 72-82°F (22-28°C) and 45-55% relative humidity. Lower temperatures and humidities will make the cure time longer. Higher temperatures will make the reaction faster and make the cure time shorter.

在 72-82°F (22-28°C) 和 45-55% 相对湿度下,涂抹的密封胶固化后,ASTM D2240 A 类型硬度计测量的硬度至少为 30。温度和湿度越低,固化时间越长。温度越高,反应越快,固化时间越短。

(3) Usual application time can be extended by refrigerated storage immediately after the mix. Once removed and thawed, sealant must not be refrigerated again. Shelf life of activated compounds, if not quick-frozen, is 7 days maximum at -20°F (-29°C) or colder, or 21 days at -40°F (-40°C) or colder. If quick-frozen, refrigerated storage of activated sealant is 7 days maximum at -20°F(-29°C) or colder, or 42 days at -40°F (-40°C) or colder.

混合后立即冷藏可延长通常的应用时间。取出并解冻后,密封胶不能再冷藏。未快速冷冻的活性化合物在-20°F(-29°C)或更低温度下的保质期最长为7天,在-40°F(-40°C)或更低温度下的保质期最长为21天。如果快速冷冻,活性密封剂的冷藏储存期限为:在-20°F(-29°C)或更低温度下最多7天,在-40°F(-40°C)或更低温度下最多42天。

(4) Shelf life of BMS 5-95 sealant is 6 months at 40-90°F (4-32°C).

BMS 5-95密封胶在40-90°F(4-32°C)下的保质期为6个月。

C. BMS 5-142, Class B Sealant

BMS 5-142,B级密封胶

(1) The different classes give you a selection of different application and cure times. These times are approximate.

不同等级的密封胶为您选择不同的应用和固化时间。这些时间均为近似值。

(2) The applied sealant will cure as indicated at 72-82°F (22-28°C) and 50-55% relative humidity. Lower temperatures and humidities will make the cure time longer. Higher temperatures will make the reaction faster and make the cure time shorter.

密封胶在 72-82°F (22-28°C) 和 50-55% 相对湿度下固化。温度和湿度越低,固化时间越长。温度越高,反应越快,固化时间越短。

(4) Shelf life of BMS 5-142 sealant is 6 months at 40-90°F (4-32°C).

BMS 5-142密封剂的保质期为6个月,温度为40-90°F(4-32°C)。

D. Dow Corning 93-006 Sealant

道康宁93-006密封胶

(1) You have a selection of different application and cure times. These times are approximate.

可以选择不同的应用和固化时间。这些时间均为近似值。

(2) The applied sealant will cure as indicated at 72-82°F (22-28°C) and 50-55% relative humidity. Cure time for the best physical properties is 7 days.

密封胶将在22-28°C(72-82°F)和50-55%相对湿度下固化。最佳物理性能的固化时间为7天。

(3) Dow Corning 93-006 sealant must be used only in areas that will not be subsequently painted.

道康宁93-006密封胶只能用于日后不会喷漆的区域。

(4) If you use this sealant, you must first apply Dow Corning PR-1200 primer. See Paragraph 5.C. for more details.

如果使用这种密封胶,必须先涂道康宁PR-1200底漆。详情请参阅第5.C.段。

CAUTION ：DO NOT USE DRY ICE OR CARBON DIOXIDE ATMOSPHERE TO STORE OR QUICK-FREEZE SILICONE SEALANTS. CARBON DIOXIDE GAS WILL CHANGE THE CURE OF THE SEALANT.

注意:请勿使用干冰或二氧化碳环境来储存或快速冷冻硅酮密封胶。二氧化碳气体会改变密封胶的固化。

(5) Usual application time can be extended by refrigerated storage immediately after the mix. Once removed and thawed, sealant must not be refrigerated again. Shelf life of activated compounds, if not quick-frozen, is 14 days maximum at -40°F (-40°C) or colder. If quick-frozen, refrigerated storage of activated sealant is 28 days maximum at -40°F (-40°C) or colder. All refrigerated material must be packaged in sealed tubes.

混合后立即冷藏可延长通常的应用时间。取出并解冻后,密封胶不得再次冷藏。未快速冷冻的活性化合物在-40°F(-40°C)或更低温度下的保质期最长为14天。如果快速冷冻,活性密封胶在-40°F(-40°C)或更低的温度下冷藏储存最长可达28天。所有冷藏材料必须包装在密封管中。

(6) Shelf life of 93-006 sealant is 6 months at 40-80°F (4-27°C).

93-006密封胶在40-80°F(4-27°C)下的保质期为6个月。

E. Quick Rework Materials

快速返工材料

(1) When a fast cure time is important, you can use PR-1826 or PR-1828 sealants. They have these properties at 72-82°F (22-28°C) and 45-55% relative humidity:

当快速固化时间很重要时,您可以使用PR-1826或PR-1828密封胶。它们在72-82°F(22-28°C)和45-55%相对湿度下具有以下特性:

(2) Do not apply PR-1826 or PR-1828 on or adjacent to acrylic components such as windows. These sealants can cause crazing of acrylics.

不要在丙烯酸部件(如窗户)上或附近使用PR-1826或PR-1828。这些密封胶可能会导致丙烯酸材料出现裂纹。

(3) The applied sealant will cure as indicated at 72-82°F (22-28°C) and 45-55% relative humidity. Cure time for the best physical properties is 7 days.

密封胶将在22-28°C(72-82°F)和45-55%相对湿度下固化。最佳物理性能的固化时间为7天。

(4) If you use PR-1826 sealant, you must first apply the primer that comes with the sealant. See Paragraph 5.D. for more details.

如果使用PR-1826密封胶,必须先涂上密封胶附带的底漆。详情请参阅第5.D.段。

(5) PR-1828 sealant will bond to most surfaces. But on clad aluminum, you can get a better bond if you first use Scotch-Brite to make the surface rough and not shiny.

PR-1828密封胶可与大多数表面粘合。但在复合铝上,如果先用Scotch-Brite百洁布使表面粗糙且不反光,则粘合效果更好。

(6) Shelf life of PR-1826 and PR-1828 sealants is 6 months at 35-80°F (2-27°). Do not freeze these sealants.

PR-1826和PR-1828密封剂的保质期为6个月,温度为35-80°F(2-27°)。请勿冷冻这些密封剂。

F. PR-2001 Sealant

PR-2001密封剂

(1) The different classes give you a selection of different application and cure times. These times are approximate.

不同等级的密封胶为您选择不同的应用和固化时间。这些时间均为近似值。

在72-82°F(22-28°C)和45-55%相对湿度下,涂抹的密封胶固化后,其硬度至少达到使用ASTM D2240 A型硬度计测量的30。温度和湿度越低,固化时间越长。温度越高,反应越快,固化时间越短。

(3) Shelf life of PR-2001 sealant is 6 months at 60-80°F (15-26°C).

PR-2001密封胶在60-80°F (15-26°C) 下的保质期为6个月。

5. SURFACE PREPARATION 表面准备

A. Use clean wipers and the applicable solvent to remove all grease, oil, dirt and unwanted matter from the surfaces that will have sealant applied to them. Vacuuming or compressed air can also be used but vacuuming is preferred to compressed air to prevent the spread of contamination to other areas. On or near acrylic surfaces, use only aliphatic naphtha, to prevent crazing. On other surfaces, use BMS 11-7, Citra-Safe, methyl ethyl ketone, methyl propyl ketone, or the MPK-sec-Butyl mix, or FCC-55. Do not use too much cleaner. Do not let the cleaner dry on the surface.

使用干净的刷子和适当的溶剂清除待涂密封胶的表面上的所有油脂、油污、灰尘和不需要的物质。也可以使用真空吸尘器或压缩空气,但真空吸尘器比压缩空气更可取,因为这样可以防止污染物扩散到其他区域。在丙烯酸表面或附近,只能使用脂肪族石脑油,以防止出现裂纹。在其他表面上,使用BMS 11-7、Citra-Safe、甲基乙基酮、甲基丙基酮或MPK-sec-Butyl混合物或FCC-55。不要使用过多的清洁剂。不要让清洁剂在表面上变干。

B. Dry the surfaces with clean wipers. Clean the surfaces again until the wipers stay clean and the surface is visually clean. Make sure you include the slots and the recesses.

用干净的刷子擦干表面。再次清洁表面,直到刷子保持干净且表面看起来干净为止。确保清洁缝隙和凹槽。

C. On surfaces to get Dow Corning 93-006 sealant, apply Dow Corning PR-1200 primer first. Apply a thin layer of the primer with a brush or a clean wiper. Let the primer dry a minimum of 60 minutes before you apply the sealant. If the primer becomes dirty or the sealant is not applied in 24 hours, remove the primer from the surface as specified by Paragraph 5.A. and Paragraph 5.B. Then apply a new layer of the primer.

在需要涂抹道康宁93-006密封胶的表面上,先涂抹道康宁PR-1200底漆。用毛刷或干净的刷子涂抹薄薄一层底漆。底漆至少干燥60分钟后,再涂抹密封胶。如果底漆变脏或密封胶在24小时内未使用,请按照第5.A.和第5.B.段的规定从表面清除底漆。然后重新涂上一层底漆。

D. On surfaces to get PR-1826 sealant, apply the primer first. (Do not use primer if conditions are 50°F (10°C) or colder.) Apply a thin layer of the primer with a brush or a clean wiper. Let the primer dry a minimum of 30 minutes before you apply the sealant. If the primer becomes dirty or the sealant is not applied in 24 hours, remove the primer from the surface as specified by Paragraph 5.A. and Paragraph 5.B. Then apply a new layer of the primer.

在表面涂抹PR-1826密封胶前,请先涂上底漆。(如果温度是50°F(10°C)或更低,请勿使用底漆。)用毛刷或干净的刷子涂上一层薄薄的底漆。在涂密封胶前,让底漆干燥至少30分钟。如果底漆变脏或密封胶在24小时内未涂上,请按照第5.A.和第5.B.段的规定从表面清除底漆。然后涂上一层新的底漆。

6. SEALANT PREPARATION 密封胶准备

A. Mix the base compound with matched activator (identified with the same batch number as on the base compound). Use the vendor’s recommended proportions and procedures. Be careful not to mix air into the mixture. Mix the sealant until the color is smooth.

将基料化合物与匹配的催化剂(与基料化合物具有相同的批号)混合。使用供应商推荐的配比和程序。注意不要将空气混入混合物中。混合密封胶,直到颜色均匀。

B. Equipment used to mix silicone sealants must not be used to mix non-silicone compounds, because the silicone cannot be completely cleaned from the equipment, and because silicone can cause problems with the bonds of the non-silicone materials. Be sure to identify such equipment.

用于混合硅酮密封胶的设备不得用于混合非硅酮化合物,因为硅酮无法从设备上完全清除,而且硅酮可能会导致非硅酮材料的粘结出现问题。请务必识别此类设备。

7. APPLICATION 应用

CAUTION ：DO NOT APPLY BMS 5-45 OR BMS 5-95 OR BMS 5-142 SEALANT OVER ZINC CHROMATE OR BMS 10-11, TYPE 1 PRIMERS UNTIL THE PRIMER DRIES A MINIMUM OF 6 HOURS AT ROOM TEMPERATURE.

注意:在铬酸锌或BMS 10-11,类型1底漆在室温下干燥至少6小时之前,不要在它们上面涂BMS 5-45或BMS 5-95或BMS 5-142密封胶。

CAUTION ：USE DC 93-006 SEALANT ONLY IN AREAS THAT YOU WILL NOT PAINT. PAINT WILL NOT STAY ON SILICONE SEALANTS.

注意:仅在不需上漆的区域使用DC 93-006密封胶。油漆不会附着在硅酮密封胶上。

A. The applied sealant can be made smooth before it cures (wet method) or after it cures (dry method). If you use the wet method, use masking tape as necessary to give protection to adjacent panel skins and recesses. The mask is not necessary around recessed fastener heads.

密封胶可在固化前(湿法)或固化后(干法)进行打磨。如果使用湿法,请根据需要使用遮蔽胶带,以保护相邻的面板和凹槽。凹槽紧固件头部周围无需遮蔽。

B. If slot width A and slot depth B are in the ranges shown in Figure 1, apply sealant as follows. If not, go to Paragraph 7.C.

如果槽宽A和槽深B在图1所示范围内,请按以下步骤涂抹密封胶。否则,请跳至第7.C段。

(1) Install one panel.

安装一块面板。

(2) Put the second panel in position and drill all holes for fasteners. Complete all drilling and reaming operations.

放置第二块面板,并钻好所有用于固定螺丝的孔。完成所有钻孔和铰孔操作。

(3) Loosen the panel and clean it as specified in Paragraph 5.

松开面板,并按照第5段中的规定进行清洁。

(4) Install the panel again and complete the assembly.

重新安装面板并完成组装。

(5) Apply sealant with an extrusion gun, a paper cone, or a spatula. A gun tip with a minimum width of 0.030 inch (0.762 mm) is recommended. If the depth of the slot is more than 0.250 inch (6.35 mm), use a tip that can go into the slot to let you fill the slot from the bottom. Make sure you completely fill the slots and recesses to prevent hidden gaps and air pockets. Apply a small quantity more to make allowance for shrinkage and the sealant finishing procedures of Paragraph 8.

使用挤压枪、纸锥或抹刀涂抹密封胶。建议使用宽度至少为 0.030 英寸(0.762 毫米)的枪头。如果槽的深度超过0.250英寸(6.35毫米),请使用可以伸入槽内的喷嘴,以便从底部填充槽。确保完全填充槽和凹槽,防止出现隐藏的缝隙和气穴。多涂一点,以备收缩和第8段密封剂处理程序使用。

C. If slot width A is less than 0.020 inch (5.08 mm), or if slot depth B is more than the limit specified, apply sealant as follows:

如果槽宽 A 小于 0.020 英寸(5.08 毫米),或者槽深 B 大于规定的极限值,请按以下步骤涂抹密封胶:

(1) Install one panel.

安装一块面板。

(2) Put the second panel in position and drill all holes for fasteners. Complete all drilling and reaming operations.

放置第二块面板,并钻好所有紧固件孔。完成所有钻孔和铰孔操作。

(3) Loosen the panel and clean it as specified in Paragraph 5.

松开面板,并按照第 5 段的规定进行清洁。

(4) Apply a fillet of sealant along the butt edge of the installed panel. Push the second panel into position and install the fasteners. A small quantity of sealant can come out from the slot or recess between the panels. But be careful to keep the sealant away from the faying surfaces of the panel and the structure.

在已安装面板的对接边缘涂上密封胶（成圆角）。将第二块面板推入到位并安装紧固件。少量密封胶可能会从面板之间的缝隙或凹槽中流出。但要注意不要让密封胶接触到面板和结构的接合面。

(5) If the joint is offset, do not apply sealant if the depth of the offset is less than 0.020 inch (5.08 mm) (Figure 1), because the fillet cannot be formed satisfactorily.

如果接缝偏移,且偏移深度小于 0.020 英寸(5.08 毫米)(图 1),则不要涂抹密封胶,因为圆角无法形成。

8. FINISHING 表面处理

A. Method 1 — Dry Method (Trim and buff after the sealant cures) (Figure 2).

方法 1——干法(密封胶固化后进行修整和抛光)(图 2)。

NOTE: This method is used when the adjacent skins are not flush.

注意:当相邻面板不平整时,使用此方法。

(1) Apply sealant as specified in Paragraph 7.B.(5), but make sure the sealant is above the adjacent surfaces. Be careful to keep the height of the sealant above the adjacent surfaces to a minimum.

按照第7.B.(5)段的规定涂抹密封胶,但确保密封胶高于相邻表面。小心保持密封胶的高度超过相邻表面最小（意思就是说尽可能的只高一点点）。

(2) Before you start this procedure, let the sealant cure to an ASTM D2240 Type A durometer minimum hardness of 30.

在开始此程序之前,让密封胶固化到ASTM D2240 A型硬度计测量的硬度最低为30。

(3) Do the rough trim and sealant removal with an approved sealant removal tool as specified in SOPM 20-50-19. Be very careful not to damage metal surfaces. On exterior clad aluminum fuselage skin panels and aluminum splice plates, scribe marks near lap and butt joints could start fatigue cracks.

按照 SOPM 20-50-19 中的规定,使用批准的密封胶去除工具进行粗修整和密封胶去除。务必小心,不要损坏金属表面。在外部包覆铝制机身蒙皮板和铝制拼接板上,搭接和对接接头附近的划痕可能会导致疲劳裂纹。

(a) On unpainted clad aluminum skins, use an approved sealant removal tool (SOPM 20-50-19).

在未上漆的复合铝皮上,使用经批准的密封胶清除工具(SOPM 20-50-19)。

(b) On all other surfaces, use plastic or hardwood tools that do not scratch those surfaces and that do not move contamination into the area that can cause problems with paint or sealant bonds.

在所有其他表面上,使用不会刮伤这些表面的塑料或硬木工具,并且不会将污染物带入可能导致油漆或密封胶粘合问题的地方。

(4) If necessary, make the sealant smooth with a rubber block or wheel that has an ASTM D2240 Type A durometer hardness of 30-60. For example, you can use a gum rubber buffing wheel such as Boeing ST4359HW on an air motor or other rotary power tool to buff the sealant to flushness.

如有必要,可用ASTM D2240 A硬度计测量的硬度为 30-60的橡胶块或轮子使密封剂光滑。例如,您可以使用气动马达或其他旋转电动工具上的橡胶抛光轮（例如波音的ST4359HW ）,将密封剂打磨至光滑。

(a) When composite parts are sanded for surface preparation, you can remove unwanted sealant as part of the sanding operation.

当复合零件进行表面处理打磨时,可以在打磨操作中去除多余的密封胶。

(b) For sealants that contain chromates, apply a good quantity of water mist to the cured sealant and the rubber wheel before and during the buffing operations. After buffing, remove wetted dust before it dries or contaminates adjacent surfaces. Use a wiper wet with water or solvent. As an alternative, you can use dry buffing if you use personal protection such as a full-face respirator and protective clothing, and do the task in an approved dust booth.

对于含有铬酸盐的密封胶,在打磨操作之前和期间,在固化密封胶和橡胶轮上喷上适量的水雾。打磨后,在潮湿的灰尘变干或污染相邻表面之前将其清除。使用蘸有水或溶剂的刷子。作为替代方案,如果您使用个人防护装备(如全面罩呼吸器和防护服),并使用经批准的防尘棚进行作业,则可以使用干式打磨。

B. Method 2 — Wet Method (before the sealant cures) (Figure 2).

方法 2——湿式方法(在密封胶固化之前)(图 2)。

(1) Mask the skins adjacent to the slots and gaps before you apply sealant. It is not necessary to mask around recessed fastener heads. Put the masking tape approximately 0.05 inch (1.2 mm) from the edge of the slot. If the masking tape is too far from the edge of the slot, the sealant will overlap the skin surface and removal of this sealant overlap will be necessary before finish.

在涂抹密封胶之前,遮蔽与槽和缝隙相邻的蒙皮。凹槽紧固件头部周围无需遮蔽。将遮蔽胶带放置在距离缝隙边缘约0.05英寸(1.2毫米)处。如果遮蔽胶带距离缝隙边缘太远,密封胶将覆盖蒙皮表面,在完成之前必须去除这些密封胶。

(2) Apply sealant as specified in Paragraph 7.B.(5), but make sure the sealant is above the adjacent surfaces. Be careful to keep the height of the sealant above the adjacent surfaces to a minimum.

按照第 7.B.(5) 段的规定涂抹密封胶,但确保密封胶高于相邻表面。小心保持密封胶的高度超过相邻表面最小（意思就是说尽可能的只高一点点）。

(3) With an approved sealant removal tool (SOPM 20-50-19), remove unwanted sealant while it is wet. Make the sealant flush with the masking tape, as shown. Then complete the task as specified in Paragraph 8.B.(4) or Paragraph 8.B.(5).

使用批准的密封胶清除工具(SOPM 20-50-19),在密封胶是湿的时清除不需要的部分。如图所示,使密封胶与遮蔽胶带齐平。然后按照第8.B.(4)或第8.B.(5)段的规定完成工作。

(4) Wet Finishing: Remove the masking tape while the sealant is wet. Make the sealant smooth with an applicable tool wet with finishing solution (Paragraph 3.D.(10)).

湿处理:在密封胶是湿的时清除遮蔽胶带。用蘸有抛光液(第3.D.(10)段)的工具使密封胶光滑。

(5) Trimming and Buffing: As an alternative to Paragraph 8.B.(4), you can remove the masking tape after the sealant is cured to a minimum Type A durometer hardness of 30, and buff or sand away the unwanted sealant. Refer to Paragraph 8.A.(4) for instructions.

修整和打磨:作为第8.B.(4)段的替代方案,您可以在密封胶固化至A型硬度计所测量的硬度至少为30时,撕下遮蔽胶带,然后抛光或打磨掉多余的密封胶。请参阅第8.A.(4)段获取说明。

C. Method 3 — Optional Wet Method (before the sealant cures) (Figure 2)

方法 3——可选的湿法(在密封胶固化之前)(图 2)

(1) When you apply the sealant, include a small quantity as a bead above the adjacent surfaces.

涂抹密封胶时,在相邻表面上方留出少量密封胶（例如一滴）。

(2) Before the sealant dries, spray finishing solution (Paragraph 3.D.(10)) on the sealant and the adjacent surfaces, a minimum of one inch (2.54 cm) wider than the seal channel.

在密封胶干燥之前,在密封胶和相邻表面喷涂抛光液(第 3.D.(10) 款),宽度至少比密封槽宽一英寸(2.54 厘米)。

(3) Before the finishing solution evaporates, remove the bead with a non-metal scraper at a 30-50 degree angle, as shown. Be sure to do this before the sealant dries or cures, because then the scraper could pull the remaining sealant out of its channel and make the seal unserviceable.

在抛光液蒸发之前,用非金属刮刀以30-50度角去除密封胶条,如图所示。请务必在密封胶干燥或固化之前进行此操作,否则刮刀可能会将剩余的密封胶从其通道中拉出,导致密封失效。

D. Method 4 — Wet Finish Method for PR-2001 Sealant (Figure 2)

方法4——PR-2001密封胶的湿法表面处理方法(图2)

(1) Put masking tape approximately 0.05 inch (1.2 mm) from the edge of slots or gaps.

在距离槽或缝隙边缘约0.05英寸(1.2毫米)处贴上胶带。

(2) When you apply the sealant, include a small quantity more as a bead above the adjacent surfaces. Keep this bead to a minimum.

涂抹密封胶时,在相邻表面上方留出少量密封胶（例如一滴）。保持胶量最少。

(3) Remove unwanted sealant within its application time. Pull a scraper along the slot, with the scraper at an angle of 80-90 degrees from the surface. Do not hold the scraper at an angle more than 90 degrees. With the scraper at the specified angle, only a minimum of sealant will be pulled from the slot, and the remaining sealant will be less concave after the cure.

在密封胶适用时间内清除多余的密封胶。用刮刀沿槽刮,刮刀与表面成80-90度角。刮刀与表面的夹角不要超过90度。在刮刀保持指定角度的情况下,从缝隙中只能刮出极少量的密封胶,剩余的密封胶在固化后凹度会变小。

(4) For slots with titanium foil installed (such as 787 fuselage circumferential joins), apply masking tape approximately 0.05 inch (1.2 mm) from the edge of the slot and the edge of the foil. Use sufficient pressure to wipe the top edge of the titanium foil clean. For butt joints where the titanium foil does not wrap onto the outer surface, scrape the unwanted sealant with sufficient pressure until you can see the edge of the masking tape adjacent to the slot. But do not push the scraper too hard, or you could damage the foil.

对于安装了钛箔的槽(例如787飞机机身周向连接处),在距离槽边缘和箔边缘约0.05英寸(1.2毫米)处贴上胶带。使用足够的压力擦拭钛箔顶部边缘,使其干净。对于钛箔没有包裹到外表面的对接接头,用足够的压力刮掉多余的密封胶,直到可以看到与槽相邻的遮蔽胶带边缘。但不要用力过猛,否则可能会损坏箔片。

(5) Do final finishing by one of these two procedures:

通过以下两种方法之一进行最终处理:

(a) Remove the masking tape while the sealant is wet. Make the wet sealant smooth and flush with a tool wet with finishing solution (Paragraph 3.D.(10)). Or

在密封胶是湿的时撕下胶带。用沾有抛光液(第3.D.(10)段)的工具将湿的密封胶打磨光滑并使其平整。或者

(b) Remove the masking tape after the sealant is cured. Sealant cure times are given in Paragraph 4. Then make the sealant smooth and flush with a rubber buffing wheel or block as specified in Paragraph 8.A.(4).

在密封胶固化后撕下胶带。密封胶的固化时间在第4段中给出。然后按照第8.A.(4)段的规定,用橡胶抛光轮或抛光块将密封胶打磨光滑并使其平整。

E. Method 5 — Application of PR-2001 sealant to Fastener Drive Recesses (Figure 2)

方法 5——在紧固件驱动凹槽上涂抹 PR-2001 密封剂(图 2)

(1) Clean the surface of the fastener and the adjacent area as specified in Paragraph 5.

按照第 5 段的规定清洁紧固件表面和相邻区域。

(2) If the fasteners are wet installed with polysulfide sealant, application of adhesion promoter is permitted, but is not necessary unless specified by the overhaul instructions. If you use adhesion promoter, apply it as follows:

如果紧固件是使用聚硫密封剂湿式安装的,则允许使用粘附促进剂,但除非大修说明有规定,否则没有必要。如果使用粘附促进剂,请按照以下步骤进行涂抹:

(a) Apply a thin layer of PR-187 or PR-188 to exposed polysulfide sealant. You can use a small, round 1/8 to 1/4 inch (3-6 mm) sable brush.

在暴露的多硫化物密封胶上涂抹薄薄一层PR-187或PR-188。您可以使用直径为1/8至1/4英寸(3-6毫米)的小号圆头貂毛刷。

(b) Do not let the adhesion promoter make a pool on the fastener head or in the drive recess. Adhesion promoter that makes a pool in the fastener recess will have a blue or green appearance.

不要让粘附促进剂在紧固件头部或驱动凹槽中形成积液。在紧固件凹槽中形成积液的粘附促进剂外观为蓝色或绿色。

在涂抹PR-2001，B-2级密封胶之前,让PR-187或PR-188粘附促进剂干燥30分钟。

(3) Fill the fastener drive recess with PR-2001, Class B-2 sealant with a 1/8 inch (3 mm) or smaller injection nozzle. Inject the sealant directly into the bottom of the recess to help prevent caught air pockets.

用1/8英寸(3毫米)或更小的喷嘴将PR-2001， B-2级密封剂注入紧固件驱动凹槽。将密封剂直接注入凹槽底部,以防止出现气泡。

(4) Make the sealant smooth and flush with the fastener head with an applicable tool and as specified by the overhaul instructions, as follows:

使用合适的工具,按照大修说明中的规定,使密封剂与紧固件头部平滑齐平,具体如下:

(a) Make sure the sealant touches all around the fastener recess.

确保密封胶与紧固件凹槽四周接触。

(b) Work the sealant to remove surface voids and bubbles.

挤压密封胶,去除表面空隙和气泡。

为防止密封胶从紧固件驱动凹槽中脱落,请执行以下两步操作:

1) Hold the tool vertical in the center of the recess and pull it across the recess to the outside edge.

将工具垂直放置在凹槽中央,并沿凹槽向外边缘拉动。

2) Do this again, from the center to the outside edge, in the opposite direction.

沿相反方向从中心到外缘重复上述步骤。

(d) Remove unwanted sealant from the fastener head with clean, dry wipers. Be careful not to touch the sealant in the fastener drive recess.

用干净、干燥的刷子清除紧固件头上的多余密封胶。注意不要碰到紧固件驱动凹槽中的密封胶。

F. Method 6 — Installation of Metal Foil Composite Edge Protection with PR-2001 Sealant (Figure 2)

方法 6——使用 PR-2001 密封胶安装金属箔复合边缘保护(图 2)

NOTE: The overhaul instructions will specify when to install metal foil for composite edge protection. The configuration of the metal foil and the composite edge can be different for different applications.

注意:大修说明将具体说明何时安装金属箔片,以进行复合边缘保护。金属箔片和复合边缘的配置可能因应用场合而异。

(1) Clean the composite edges as specified in Paragraph 5. for a distance of approximately 0.2 inch (5 mm) out from the area to get the foil.

按照第5段所述,清洁复合边缘,距离要取箔片的位置约0.2英寸(5毫米)。

(2) Clean each side of the foil as specified in Paragraph 5.

按照第5段所述,清洁箔片的每一面。

(3) Install the metal foil within the application life of the sealant, as follows (or by a procedure that will give the same result):

在密封胶的使用期限内安装金属箔,具体如下(或采用其他效果相同的步骤):

(a) Use a premixed frozen or Semkit form of PR-2001 Class B sealant.

使用预混合的冷冻或Semkit形式的PR-2001，B级密封胶。

(b) Apply a bead of PR-2001 Class B-2 sealant to the composite edge or the metal foil. If PR-2001 Class B-2 sealant will be applied on polysulfide sealant (such as BMS 5-45, BMS 5-95 or BMS 5-142), application of adhesion promoter is optional. When adhesion promoter is used, refer to Paragraph 8.E.(2).

在复合边缘或金属箔上涂上PR-2001，B-2级密封胶。如果 PR-2001，B-2 级密封胶将涂覆在聚硫密封胶(如 BMS 5-45、BMS 5-95 或 BMS 5-142)上,则可选择是否涂覆粘附促进剂。如果使用粘附促进剂,请参阅第 8.E.(2) 款。

(c) Within the sealant application time, apply and smooth the sealant on the foil installation area. You can use Boeing standard tool ST982SB sealant spreaders to apply the sealant on forward facing edges of 787 fuselage sections. The thickness of the applied sealant (approximately 0.005-0.009 inch or 0.127-0.229 mm) must be sufficient to give continuous squeeze-out between the composite edge and the metal foil.

在密封胶适用时间内,将密封胶涂覆并抹平在箔片安装区域。您可以使用波音标准工具 ST982SB 密封胶涂抹器在 787 机身部分的前缘涂抹密封胶。涂抹的密封胶厚度(约 0.005-0.009 英寸或 0.127-0.229 毫米)必须足以在复合材料边缘和金属箔之间连续挤出。

(d) Within the application time of the sealant, put the metal foil on the composite edge and tightly push the foil into position by hand or with a tool such as a roller. Refer to the overhaul instructions for the length, number and position of the metal foil segments.

在密封胶的适用时间内,将金属箔片放在复合边缘上,用手或工具(如滚筒)将其推入到位。金属箔片的长度、数量和位置请参考大修说明。

(e) Connect the metal foil segments as specified by the overhaul instructions. Put a minimum overlap of 0.25 inch (6.4 mm) in the ends of adjacent foil pieces. Then apply PR-2001 Class B-2 sealant to the areas of overlap.

根据大修说明连接金属箔片。相邻箔片末端至少重叠0.25英寸(6.4毫米)。然后在重叠区域涂抹PR-2001，B-2级密封胶。

(f) Within the application life of the sealant, hold the foil in position with tape, tightly stretched around the foil along the length of the composite edge, or use an equivalent procedure. Do not put tape on the end of the metal foil if another metal foil will be installed above it as shown in Figure 2. To prevent a bond between the tape and the foil, you can put a clear strip of plastic (such as polyethylene) in the center of the tape or on the metal foil. Use a tape that does not contain silicone adhesive, and that will not contaminate the surface with a residue or interfere with the sealant cure. For flat metal foil installations (Figure 3), PR-2001 sealant squeeze-out (made within its application life) can be made smooth on the foil surface or primed composite edge that is perpendicular to the outside mold line if you can see some of the foil.

在密封胶的使用期限内,用胶带固定箔片,沿着复合边缘的长度方向将胶带紧紧拉伸到箔片周围,或使用等效程序。如果金属箔的顶部将安装另一块金属箔,如图2所示,请勿在金属箔的末端粘贴胶带。为防止胶带与金属箔粘结,可在胶带中央或金属箔上放置一条透明的塑料条(如聚乙烯)。请使用不含硅酮胶的胶带,以免胶带残留物污染表面或影响密封胶固化。对于扁平金属箔安装(图3),如果能看到部分箔，PR-2001密封胶挤出(在其应用期限内)可以在箔表面或与外部模具线垂直的复合边缘上形成光滑的表面。

(4) Remove the tape after the sealant is cured sufficiently to prevent movement of the metal foil. PR-2001 Class B-2 sealant will cure after approximately 8 hours at standard test conditions. The cure will be slower at colder temperatures and faster at warmer temperatures.

在密封胶充分固化后,撕下胶带,防止金属箔移动。在标准测试条件下,PR-2001，B-2级密封胶将在大约8小时后固化。固化速度在低温下较慢,在高温下较快。

(5) After removal of the tape, make sure you can see that the external sealant squeeze-out between the composite surface and the foil is continuous.

撕下胶带后,确保复合表面和箔之间的外部密封胶挤出是连续的。

(6) Remove sealant squeeze-out from external surfaces and metal foil with a plastic tool or a wooden tool, such as a scraper. You can use wipers to remove unwanted sealant. For flat metal foil, PR-2001 sealant squeeze-out that is worked within its application time and smoothed on the foil can stay on the metal, if you can see some of the foil.

用塑料工具或木制工具(如刮刀)清除外部表面和金属箔上的挤出密封胶。您可以使用刷子清除多余的密封胶。对于扁平金属箔,如果能看到部分箔片，PR-2001挤出密封胶在适用时间内涂抹并抹平后,可以留在金属上。

(7) The sealant must fill the faying surface to the edge of the metal foil. The metal foil and its edges must be tightly bonded to the surface.

密封胶必须填满金属箔边缘的接合面。金属箔及其边缘必须与表面紧密粘合。

9. REPAIR 修理

A. General

通用

(1) Remove all of the bad sealant with approved sealant removal tools (SOPM 20-50-19).

使用批准的密封胶清除工具(SOPM 20-50-19)清除所有不良密封胶。

(2) If a fast cure sealant is necessary, use these sealants:

如果需要快速固化密封胶,请使用以下密封胶:

(a) BMS 5-95, Class B-1/2

(b) BMS 5-142, Type 2, Class B-1

(d) PR-1828, Class B-1/2 or B-1/4

(e) BMS 5-175, Type 1, Class B-1/2

(f) DC 93-006-1

B. Repair of Fillet or Slot Seals

角缝或槽缝密封的修理

(1) Remove sealant defects without damage to the structure. Cut away bad sealant to keep a solid sealant layer, or completely remove the sealant fillet.

去除密封缺陷,但不得损坏结构。切除损坏的密封胶,保留坚固的密封胶层,或完全去除密封胶角缝。

(2) Clean the area as specified in Paragraph 5. For slots that are 0.020-0.050 inch (0.5-1.3 mm) wide, apply the solvent and blow dry with filtered clean air.

按照第5段所述清洁该区域。对于宽度为0.020-0.050英寸(0.5-1.3毫米)的缝隙,使用溶剂并用过滤后的清洁空气吹干。

(3) Apply sealant from a gun, or use a spatula. Make sure you completely fill the slots and recesses to prevent hidden gaps and air pockets.

使用喷枪或刮刀涂抹密封胶。确保完全填满缝隙和凹槽,防止出现隐藏的缝隙和气穴。

(4) If necessary for a better appearance, you can make the sealant surface smoother with finishing solution (Paragraph 3.D.(10)).

如果为了获得更好的外观效果,可以用抛光液(第3.D.(10)段)使密封胶表面更光滑。

(5) For small repairs, no subsequent work is necessary if you make the sealant smooth during application. For other repairs, use the procedures of Paragraph 8.

对于小面积的修理,如果在涂抹密封胶时使其表面光滑,则无需后续处理。对于其他修理,请按照第8.

C. Repair of Metal Foil Composite Edge Protection (Figure 3)

金属箔复合边缘保护的修理(图3)

(1) Repair of the metal foil applied to the composite edge is different by the type of metal foil applied. The foil could be applied to a chamfer, to a 90-degree corner, or flat to a vertical edge, as shown.

复合边缘金属箔的修复因所应用的金属箔类型而异。金属箔可以应用于倒角、90度角或垂直边缘,如图所示。

(2) For protection of composite edges of 787 fuselage structure:

为保护787机身结构的复合材料边缘:

(a) The height of the metal foil above the structure must not be more than 0.020 inch (0.5 mm), unless specified by Paragraph 9.C.(2)(b).

除非第9.C.(2)(b)段另有规定,金属箔在结构上方的高度不得超过0.020英寸(0.5毫米)。

(b) As an exception, the height of 10 percent of the metal foil for each application (such as a circumferential join or cutout) can be from 0.020 to 0.030 inch (0.5 to 0.76 mm) above the structure. Foil with too much sealant, wrinkles and overlapping segments is included in the 10 percent value.

作为例外,每种应用(例如周向连接或切口)中10%的金属箔的高度可以在结构上方0.020至0.030英寸(0.5至0.76毫米)范围内。箔上密封胶过多、有褶皱和重叠部分,均包含在10%的范围内。

(3) Repair the chamfer and 90-degree metal foil used for composite edge protection as specified in Table 1. Repair flat metal foil used for composite edge protection as specified in Table 2.

修复用于复合边缘保护的倒角和90度金属箔,如表1所示。修复用于复合边缘保护的扁平金属箔,如表2所示。

(4) When foil replacement is specified in Table 1 or Table 2, remove and replace damaged foil or all of the foil segment as follows:

当表1或表2中规定更换金属箔时,请按照以下步骤拆除并更换损坏的金属箔或所有箔片:

(a) Remove sealant as necessary to get access to the foil. Be careful not to damage the structure or the foil that will stay on the structure.

必要时去除密封胶,以便接触到金属箔。注意不要损坏结构或留在结构上的金属箔。

(b) Pry up the foil in the damaged area, and then cut or tear the foil across. Be careful not to cause damage while you pry up the foil. Use scissors or some other tool to cut or tear the foil after it is pried up. Do not cut the foil with the structure directly below the foil.

撬起受损区域的金属箔,然后将其横向剪断或撕开。撬起金属箔时注意不要造成损坏。将箔纸撬起后,用剪刀或其他工具剪断或撕开。不要在箔纸正下方的结构下剪裁箔纸。

(c) Pull or roll the foil back approximately 1 inch (2.5 cm) on each side of the damaged area. If the damaged area is large, removal of a complete segment of foil could be necessary.

在受损区域的每一侧将箔纸向后拉或卷起约1英寸(2.5厘米)。如果受损区域较大,可能需要移除整个箔纸。

(d) Cut or tear the foil off on each side of the damaged area. Do not cut the foil with the structure directly below it. You can use scissors, needle-nosed pliers or equivalent tools to cut or tear the foil. You can use Boeing standard tool ST201J-series shears to cut the foil applied to the forward facing edge of the 787 circumferential joint.

剪下或撕下受损区域两侧的金属箔。不要在金属箔正下方的结构下剪裁箔纸。您可以使用剪刀、尖嘴钳或等效工具剪下或撕下金属箔。您可以使用波音标准工具ST201J系列剪钳剪下787环状接头前缘的金属箔。

(e) If the foil is bent up, tap or push it to make it straight.

如果金属箔翘起,请轻敲或推动使其变直。

(f) If the foil remaining on the structure is disbonded, apply sealant below it as specified in Table 1 Defect A or Table 2 Defect A, as applicable.

如果结构上残留的金属箔出现脱胶,请根据表1缺陷A或表2缺陷A的规定在其下方涂上密封胶。

(g) Remove the remaining sealant with a scraper. You can use wipers wet with solvent to help remove the sealant. If the access is not easy, try to remove most of the sealant; remaining sealant is permitted in these areas.

用刮刀清除剩余的密封胶。您可以使用蘸有溶剂的刷子来帮助清除密封胶。如果通道不畅通,请尝试清除大部分密封胶;这些区域允许残留密封胶。

(h) Apply a new piece or segment of foil as specified in Paragraph 8.F.

按第8.F段的规定，应用一块或一段新的金属箔。

(5) Quality Control

质量控制

(a) Unless the overhaul instructions are different, the finished sealant must be approximately flush with adjacent external surfaces. The sealant must not extend above adjacent surfaces. The sealant can be slightly concave compared to the adjacent surfaces.

除非大修说明另有规定,否则密封胶的最终厚度必须与相邻的外表面大致齐平。密封胶不得超出相邻表面。密封胶与相邻表面相比可以略微凹陷。

(b) The applied sealant must be continuous, with no voids, holes, bubbles or cracks, no defects such as tool marks, unwanted material such as embedded metal chips, and no defects in the surface of the sealant.

涂覆的密封胶必须连续,不得有空隙、孔洞、气泡或裂缝,不得有工具痕迹等缺陷,不得有嵌入金属屑等不需要的材料,且密封胶表面不得有缺陷。

仅使用规定的密封胶。

(d) Metal foil applied to the part must have no wrinkles, dents, tears or other defects.

零件上的金属箔不得有皱褶、凹痕、撕裂或其他缺陷。

(e) For 90-degree and chamfered metal foil installations, sealant squeeze-out must be removed from the part and foil surfaces.

对于90度金属箔和倒角金属箔的安装,必须清除零件和箔表面上的挤出密封胶。

(f) For flat metal foil installations, sealant squeeze-out after installation:

对于平面金属箔的安装,安装后挤出密封胶:

1) Can stay if it is smoothed and not completely removed from the part and/or foil surfaces, or

如果密封胶被抹平且没有从零件和/或箔片表面完全清除,则可以保留;或者

2) Can be removed from the part and/or foil surfaces.

可以从零件和/或箔片表面清除。

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