1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3374D AEROSPACE MATERIAL SPECIFICATION AMS3374 REV. D Issued 1987-01 Revised 2013-11 Super
5、seding AMS3374C Sealing Compound Aircraft Firewall, Silicone RATIONALE 5 year review. Defined spec to be for silicone firewall sealants. Updated standard language in sections 4 and 8. Revised surface treatment of aluminum panels to sulfuric acid anodize due to temperature considerations. Removed Cor
6、rosion Resistance reference from Table 1. Added Table 3. 1. SCOPE 1.1 Form This specification covers six (6) types of silicone sealing compounds curing to elastomeric materials. 1.2 Application These products are used primarily for sealing aircraft firewall structures against passage of air, vapors,
7、 and flames but usage is not limited to such applications. The sealing compounds are effective at all temperatures from -65 to +400 F (-54 to +204 C) and are able to withstand flash temperatures of up to 2000 F (1093 C). 1.3 Safety - Hazardous Materials Shall be in accordance with AS5502 (1.1) 1.4 C
8、lassification Compounds covered by this specification are classified as follows: Type 1 - One-part (or two part, pre-mixed, room temperature stable) high temperature silicone, condensation cured Type 2 - Two-part high temperature silicone, addition cured Type 3 - Two-part high temperature silicone,
9、condensation cured Type 4 - Two-part high temperature silicone, rapid curing, condensation cured Type 5 - One-part high temperature silicone, condensation cured, extended life Type 6 - Two-part high temperature silicone, lightweight, rapid curing, addition cured 2. APPLICABLE DOCUMENTS The issue of
10、the following documents in effect on the date of the purchase order form a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been canceled and no supe
11、rseding document has been specified, the last published issue of that document shall apply. SAE AMS3374D Page 2 of 9 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.
12、sae.org. AMS2471 Anodic Treatment of Aluminum Alloys Sulfuric Acid Process, Undyed Coating AMS3021 Fluid, Reference for Testing Di-Ester (Polyol) Resistant Material AMS4911 Titanium Alloy Sheet, Strip, and Plate, 6Al 4V, Annealed AMS5517 Steel, Corrosion Resistant, Sheet and Strip 18Cr-8Ni (SAE30301
13、), Cold Rolled, 125 ksi (862MPa) Tensile Strength AMS-QQ-A-250/5 Aluminum Alloy Alclad 2024, Plate and Sheet AS1241 Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft AS5127 Methods for Testing Aerospace Sealants AS5127/1 Aerospace Standard Test Methods for Aerospace Sealants Two-Component
14、Synthetic Rubber Compounds AS5127/2 Test Method for Aerospace Firewall Sealant Flame Penetration AS5502 Standard Requirements for Aerospace Sealants 2.2 PRI Publications Available from Performace Review Institute, 161 Thorn Hill Road, Warrendale, PA15086-7527, Tel: 724-772-1616, www.pri-. PD2000 Pro
15、cedures for an Industry Qualified Product Management Process PD2001 Manufacturer Request for Product Approval and Qualification Process PD2103 Aerospace Quality Assurance, Product Standards, Qualification Procedure, Sealants PRI-QPL-AMS3374 Products Qualified Under AMS3374 3. TECHNICAL REQUIREMENTS
16、3.1 Date of Packaging Shall be in accordance with AS5502 (3.1). 3.1.1 Shelf life of sealing compounds conforming to Types 1 - 4 and Type 6 shall be a minimum of 6 months when stored at manufacturers recommended conditions. Shelf life of sealing compound conforming to Type 5 shall be a minimum of 2 y
17、ears when stored at manufacturers recommended conditions. 3.2 Toxicological Formulations Shall be in accordance with AS5502 (3.2). 3.3 Quality Shall be in accordance with AS5502 (3.3). SAE AMS3374D Page 3 of 9 3.4 Properties Shall conform to the following requirements and test methods in Table 1. TA
18、BLE 1 PROPERTIES Property Requirement Test Procedures (paragraph) 3.4.1 Nonvolatile Content, % min. AS5127/1 (5.1) Type 1 90 Type 2, 6 97 Type 3 96 Type 4 96 Type 5 80 3.4.2 Flow, inches (mm), max 0.5 (13) AS5127/1 (5.5.1) 3.4.3 Application Time, hours, min (25 g/minute requirement) AS5127/1 (5.6.2)
19、 Type 1, 5 Not applicable Type 2, 3 4 Type 4 0.5 Type 6 (5 g/minute requirement) 0.5 3.4.4 Tack-Free Time, hours, max. AS5127/1 (5.8) Types 1, 3, 5 6 Type 2, 6 24 Type 4 2 3.4.5 Specific Gravity, max AS5127/1 (6.1) Types 1, 3, 4, 5 1.5 Type 2 1.6 Type 6 0.85 3.4.6 Standard Cure Time, (to reach 30 Du
20、rometer A), max. AS5127/1 (6.2) Types 1, 2, 3, 5, 6 48 hrs Type 4 4 hrs 3.4.7 Resistance to Thermal Rupture, max. deformation, oven air aging at 300 F (149 C), 10 psi (69 kPa) 30 minutes 0.125-inch (3.2 mm) No blistering or sponging AS5127/1 (7.2) 13.4.8 Low Temperature Flexibility No cracking or lo
21、ss of adhesion AS5127/1 (7.6.1) 13.4.9 Oil Resistance No loss of adhesion, softening, blistering or reversion AMS3374 (4.5.1) 3.4.10 Shear Strength, psi (kPa) min. 85% Cohesion min. AMS3374 (4.5.2) Type 1, 2, 3, 4, 5 150 (1034) Type 6 100 (690) SAE AMS3374D Page 4 of 9 TABLE 1 - PROPERTIES (CONT.) P
22、roperty Requirement Test Procedures (paragraph) 3.4.11 Flame Resistance No Flame Penetration AS5127/2, Class B 3.4.12 Peel Strength, lbs./inch (N/m), min. AS5127/1 (8.2) 3Types 1, 2, 3, 4, and 5 10 (1750) Type 6 5 (875) 3.4.13 Repairability Adhere, meet 3.4.12 requirements AS5127/1 (8.2) 33.4.14 Sto
23、rage Stability 3.4.14.1 Accelerated Storage Type 2 only Meet AMS3374 (4.2.2) requirements AS5127/1 (9.1) 43.4.14.2 Long Term Storage Meet AMS3374 (4.2.2) requirements AS5127/1 (9.2) 51 Test control specimens only, no AMS2629 exposure requirement. 2 Test using 2 each AMS-QQ-A-250/5 aluminum alloy ano
24、dized per AMS2471, AMS4911 titanium alloy and AMS5517 stainless steel panels only. Test control specimens and specimens aged in air at 400 F 5 (204 C 3) for 72 hours 1. 3 Omit AMS2629 fluid soak from panel preparation. 4 Use AS5127/1 (9.1) for sealing compound material conditioning only. 5 AS5127/2
25、compliant materials shall be tested per manufacturers recommendations. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection Shall be in accordance with AS5502 (4.1). 4.1.1. Source Inspection Shall be in accordance with AS5502 (4.1.1). 4.2 Classification of Tests Shall be in accordance w
26、ith AS5502 (4.2). 4.2.1 Qualification Tests Shall be in accordance with AS5502 (4.2.1). Any changes in ingredients and/or processing of any adhesion promoter used to qualify sealing compounds shall require retesting of all technical requirements in Table 1, which rely on the use of adhesion promoter
27、 for qualification Low Temperature Flexibility (3.4.8), Oil Resistance (3.4.9), Shear Strength (3.4.10), Peel Strength (3.4.12) and Repairability (3.4.13). 4.2.1.1 Qualification All materials sold to this specification shall be listed or approved for listing on the PRI qualified products list, PRI Q
28、PL-AMS3374. The qualified products list shall be in accordance with PD2000, PD2001 and PD2103. 4.2.2 Initial Acceptance Tests Requirements in Table 2 shall be tested in accordance with AS5502 (4.2.2.1). SAE AMS3374D Page 5 of 9 TABLE 2 INITIAL ACCEPTANCE TESTS Test Requirement Paragraph Nonvolatile
29、Content 3.4.1 Flow 3.4.2 Application Time 3.4.3 Tack-Free Time 3.4.4 Standard Cure Time 3.4.6 Shear Strength13.4.10 Peel Strength23.4.12 1 Test only using AMS4911 titanium substrate 2 Test only using AMS-QQ-A-250/5 aluminum alloy anodized per AS2471 substrate. Omit for Type 2 material. 4.2.3 Final A
30、cceptance Tests Requirements in Table 3 shall be tested in accordance with AS5502 (4.2.2.2). TABLE 3 FINAL ACCEPTANCE TESTS Test Requirement Paragraph Application Time 3.4.3 Tack-Free Time 3.4.4 Standard Cure Time 3.4.6 4.3 Sampling and Testing Shall be in accordance with AS5502 (4.3). 4.3.1 Accepta
31、nce Tests Shall be in accordance with AS5502 (4.3.1). 4.3.1.1 Batch and Lot A batch shall be defined as the quantity of material run through a mill or mixer at one time. A lot shall be defined as the material from one batch of each component assembled as finished product in one size and/or type of c
32、ontainer at the same time. The lot when used shall be traceable to a specific batch of base compound and curing agent. 4.3.1.2 Initial and Final Acceptance Test Each batch shall be subjected to both initial and final acceptance testing. Sufficient material for initial acceptance testing shall be pac
33、kaged in the same type of containers that are being procured. Initial acceptance test are those listed in Table 2. After successful completion of the initial acceptance tests, the batch shall be released for final packaging. During packaging, test kits shall be selected at random for final acceptanc
34、e testing. Final acceptance testing is to be conducted on the final packaged product and shall consist of those tests outlined in Table 3. 4.3.1.2.1 Final Acceptance Test Option If the batch is being packaged in different types and/or size of containers, the final acceptance tests shall be conducted
35、 on each type and/or each size of containers. If the sealing compound is being procured under different purchase orders, but the purchase orders call for the same type and size containers it is only necessary to conduct the final acceptance tests one time. SAE AMS3374D Page 6 of 9 4.3.2 Qualificatio
36、n Test Samples Samples shall consist of six containers of sealing compound. Purchaser and manufacturer shall agree upon the container size. Samples shall be identified as specified below and forwarded to the activity responsible for qualification testing as designated in the letter of authorization
37、from that activity. SEALING COMPOUND, AIRCRAFT FIREWALL, SILICONE AMS3374D Type _ Manufacturers Identification _ Name of Manufacturer_ Batch/Lot Number _ Date of Manufacture _ Shelf Life Expiration Date_ 4.3.3 Shelf-Life Surveillance and Updating 4.3.3.1 Sampling An inspection lot shall consist of i
38、tems bearing the same lot or batch identification number. The minimum number of samples to be tested from each inspection shall be in accordance with AS5502 (4.1.2). 4.4 Test Methods Shall be in accordance with test methods shown in Table 1. 4.4.1 Standard Tolerances Unless otherwise specified herei
39、n, standard tolerances of AS5127 (3.1) “Standard Tolerances” shall apply. 4.4.2 Standard Test Conditions Shall be in accordance with AS5127 (4). 4.4.3 Preparation of Test Specimens Test specimens shall be prepared in accordance with AS5127 (6) unless otherwise specified herein. 4.4.3.1 Cleaning of T
40、est Panels Test panels shall be cleaned in accordance with AS5127 (6). 4.4.3.2 Preparation of Peel Strength Test Panels Test panel configuration shall be in accordance with AS5127/1 (8) “Peel Strength Properties” and (8.1) “Peel Strength Testing” and as in Figure 22 “Five-Inch Peel Specimen Configur
41、ation”. 4.4.4 Application of Adhesion Promoter When required by the sealant manufacturer, apply the recommended adhesion promoter in accordance with AS5127 (6.7) “Application of Adhesion Promoter”. Any adhesion promoter used for qualification must be documented and will be included on any qualificat
42、ion approval documentation. 4.4.5 Application of Sealing Compound Unless otherwise specified herein, freshly mixed or opened sealing compound shall be applied to test panels in accordance with AS5127 (6.8) “Application of Sealing Compound”. SAE AMS3374D Page 7 of 9 4.4.6 Cure of Sealant Compound Cur
43、e the sealing compound at standard conditions in accordance with AS5127 (4) according to the schedule in Table 2. Use Standard Cure for qualification or preproduction testing. Accelerated Cure, Table 4, is optional and may be used for acceptance testing. TABLE 4 Type Standard Cure Accelerated Cure 1
44、, 3, 5 14 days None 2, 6 7 days 1 day at standard conditions + 4 hours at 120 F (49 C) 4 7 days None 4.5 Test Procedures Standard Test methods are in accordance with AS5127, AS5127/1, and AS5127/2. In the event of a conflict between the text of this document and any of the aforementioned documents,
45、the text of this document takes precedence. 4.5.1 Oil Resistance All test panels shall be cleaned in accordance with AS5127 (6.1.1). Prepare two panels AMS-QQ-A-250/5 aluminum alloy chemically treated per AS5127 (6.1), 0.040 2.75 6 inches (1.0 69.8 152 mm), and apply two parallel strips of sealing c
46、ompound, each strip being 0.188 0.75 5 inches (4.76 19 127mm) extending to within 0.5 inch (13 mm) of the edge of the panel. Compound on the panel shall be cured as in 4.4.6. Immerse panels vertically in AMS3021 fluid at 140 F (60 C) for 72 hours 1. Examine sealant to requirements of Table 1 (3.4.9)
47、. 4.5.2 Shear Strength Twenty-four of each of the following panels shall be prepared: 0.050 1 3 inches (1.27 25 76 mm), corrosion resistant steel alloy conforming to AMS5517 0.050 1 3 inches (1.27 25 76 mm), titanium alloy conforming to AMS4911 0.050 1 3 inches (1.27 25 76 mm), AMS-QQ-A-250/5 alumin
48、um alloy anodized per AMS2471 All panels shall be cleaned in accordance with AS5127 (6.1.1) and arranged in pairs to fabricate 12 lap shear specimens. Mixed sealant shall be applied to a one square inch area at one end of each panel. Allow Type 5 sealant to air dry 15 minutes before assembling panels. The panels shall then be assembled with a one square inch overlap and contact pressure applied and
