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 theref
2、rom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2014 SAE InternationalAll rights reserved. No part of this publi
3、cation may 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 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS3381AEROSPACE MATERIAL SPECIFICATIONAMS3381Issued 2014-05Superseding MIL-S-38249Sealing Co
5、mpound, Aircraft Firewall, Non-SiliconeRATIONALEThis document replaces MIL-S-38249 (cancelled in 1997) for flame-resistant, non-silicone, elastomeric compounds for sealing of firewall structure. AS5127/2 Class C is referenced for flame resistance requirements. AMS3374 supersedes MIL-S-38249 for sili
6、cone compounds.1. SCOPE1.1 FormThis specification covers non-silicone synthetic rubber sealing compounds curing to elastomeric materials.1.2 ApplicationThese products are used primarily for sealing aircraft firewall structures against passage of air, vapors, and flames but usage is not limited to su
7、ch applications. The sealing compounds are effective at all temperatures from -65 to 400 F (-54to 204 C) and are able to withstand flash temperatures of up to 2000 F (1093 C). Sealants qualified to this specification are defined as flame tolerant in accordance with AS5127/2 and are able to prevent f
8、lame penetration from incidental exposure to smaller fires. Users should evaluate their specific flame-resistance requirements prior to specifying any firewall sealing compound.1.3 ClassificationNone1.4 Safety - Hazardous MaterialsShall be in accorrdance with AS5502 (1.1).2. APPLICABLE DOCUMENTSShal
9、l be in accordance with AS5502 (2.).2.1 SAE PublicationsAvailable 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.sae.org.AMS2629 Fluid, Jet ReferenceAMS3021 Fluid, Reference for Testing Di-Ester
10、(Polyol) Resistant MaterialSAE INTERNATIONAL AMS3381 Page 2 of 7AMS4911 Titanium Alloy Sheet, Strip, and Plate, 6Al-4V, AnnealedAMS5517 Steel, Corrosion Resistant, Sheet and Strip, 18Cr-8Ni (SAE 30301), Cold Rolled, 125 ksi (862 MPa) Tensile StrengthAMS-QQ-A-250/5 Aluminum Alloy Alclad 2024, Plate a
11、nd Sheet AS1241 Fire Resistant Phosphate Ester Hydraulic Fluid for AircraftAS5127 Aerospace Standard Test Methods for Aerospace Sealants; Methods for Preparing Aerospace Sealant Test SpecimensAS5127/1 Aerospace Standard Test Methods for Aerospace Sealants, Two-Component Synthetic Rubber CompoundsAS5
12、127/2 Test Methods for Aerospace Firewall Sealant Flame PenetrationAS5502 Standard Requirements for Aerospace Sealants and Adhesion Promoters2.2 PRI PublicationsAvailable from Performance Review Institute, 161 Thornhill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, or www.pri-network.org.PD200
13、0 Governance and Administration of an Industry Managed Product Qualification ProgramPD2001 Manufacturer Request for Product Approval and Qualification ProcessPD2103 Aerospace Quality Assurance, Product Standards, Qualification Procedure, SealantsPRI-QPL-AMS3381 Products Qualified under AMS33813. TEC
14、HNICAL REQUIREMENTS3.1 MaterialsThe basic ingredients shall not contain silicone compounds. The base compound and curing agent shall possess sufficient color contrast to permit easy identification of an unmixed or incompletely mixed sealing compound.3.2 Date of PackagingShall be in accordance with A
15、S5502 (3.1).3.3 Toxicological FormulationsShall be in accordance with AS5502 (3.2).3.4 QualityShall be in accordance with AS5502 (3.3).3.5 Shelf LifeShelf life of sealing compounds shall be a minimum of 12 months from date of packaging when stored below 80 F (27 C).3.6 PropertiesShall conform to the
16、 following requirements and test methods shown in Table 1.SAE INTERNATIONAL AMS3381 Page 3 of 7TABLE 1 - PROPERTIESProperty Requirement Test Procedures (paragraph)3.6.1 Nonvolatile Content, min 65% AS5127/1 (5.1)3.6.2 Flow, max 1.5 in (38 mm) AS5127/1 (5.5.1)3.6.3 Application Time, min, not less tha
17、n 15 grams/minute shall be extruded1.5 hrs AS5127/1 (5.6.2)3.6.4 Tack-Free Time, hours, max 24 hrs AS5127/1 (5.8)3.6.5 Specific Gravity, max 1.5 AS5127/1 (6.1)3.6.6 Standard Cure Time, (to reach 30Durometer A), max48 hrs AS5127/1 (6.2)3.6.7 Resistance to Thermal Rupture, max deformation, AS5127/1 (7
18、.2)13.6.7.1 Oven air aging at 400 10 F (204 5C), 50.5psi (34kPa),15minutes0.125 inch (3.2 mm)No blistering or sponging3.6.7.2 Room temp test of 2000 F Flame-tested panel, max deformation0.125 inch (3.2 mm)3.6.8 Low Temperature Flexibility No cracking, checking, or loss ofadhesionAS5127/1 (7.6.1)13.6
19、.9 Oil Resistance No loss of adhesion, softening, blistering or reversionAMSXXXX (4.5.1)3.6.10 Corrosion Resistance No loss of adhesion, softening, blistering or leaching of the sealing compound or corrosion of the panel under the sealant.AMSXXXX (4.5.2)3.6.11 Flame Resistance Sealing compound shall
20、 not burn through to panel and shall not continue to burn after a flame exposure of 15 minutesAS5127/2 (8)3.6.12 Peel Strength, min,Cohesive failure, min10 lbs/in (1750 N/m)100%AS5127/1 (8.1)23.6.13 Repairability Adhere, shall meet 3.6.12 requirement AS5127/1 (8.2)33.6.14 Storage Stability3.6.14.1 A
21、ccelerated StorageFlow Application TimeTack-free TimeStandard Cure TimeSame as 3.6.2Same as 3.6.3Same as 3.6.4Same as 3.6.6AS5127/1 (9.1)43.6.14.2 Long Term StorageApplication TimeTack-free TimeStandard Cure TimeSame as 3.6.3Same as 3.6.4Same as 3.6.6AS5127/1 (9.2)1Test control specimens only, no AM
22、S2629 exposure requirement.2Test using 2 each AMS-QQ-A-250/5 aluminum alloy anodized per AS5127 (6.3), AMS4911 titanium alloy and AMS5517 stainless steel panels only. Test control specimens and specimens aged in air at 400 10 F (204 5 C) for 72 hours 1.3Omit AMS2629 fluid soak from panel preparation
23、.4Use AS5127/1 (9.1) for sealing compound material conditioning only.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionShall be in accordance with AS5502 (4.1).4.1.1 Source InspectionShall be in accordance with AS5502 (4.1.1)4.2 Classification of TestsShall be in accordance with AS5502
24、 (4.2).SAE INTERNATIONAL AMS3381 Page 4 of 74.2.1 Qualification TestsShall be in accordance with AS5502 (4.2.1). Any changes in ingredients and/or processing of an adhesion promoter used to qualify sealing compounds shall require retesting of all technical requirements in Table 1 which rely on the u
25、se of an adhesion promoter for qualification (Low Temperature Flexibility (3.6.8), Oil Resistance (3.6.9), Corrosion Resistance (3.6.10), Peel Strength (3.6.12), and Repairability (3.6.13).4.2.1.1 QualificationAll materials sold to this specification shall be listed or approved for listing on the PR
26、I Qualified products list, PRI-QPL-AMS3381. The qualified products list shall be in accordance with PD2000, PD2001, and PD2103. 4.2.2 Initial Acceptance TestsRequirements shown in Table 2 are initial acceptance tests and shall be performed in accordance with AS5502 (4.2.2.1).TABLE 2 INITIAL ACCEPTAN
27、CE TESTSTest RequirementParagraphNonvolatile Content 3.6.1Flow 3.6.2Application Time 3.6.3Tack-Free Time 3.6.4Standard Cure Time 3.6.6Peel Strength13.6.1211Test only using AMS-QQ-A-250/5 aluminum alloy substrate anodized per AS5127 (6.3).4.2.3 Final Acceptance TestsRequirements shown in Table 3 are
28、final acceptance tests and shall be performed in accordance with AS5502 (4.2.2.2).TABLE 3 FINAL ACCEPTANCE TESTSTest Requirement ParagraphFlow 3.6.2Application Time 3.6.3Tack-Free Time 3.6.4Standard Cure Time 3.6.64.3 Sampling and TestingShall be in accordance with AS5502 (4.3).4.3.1 Acceptance Test
29、sShall be in accordance with AS5502 (4.3.1)4.3.1.1 Batch and LotA batch shall be defined as the quantity of material run through a mill or mixer at one time. A lot shall be defined as material from one batch of each component assembled as finished product in one size and/or type of container at the
30、same time. The lot, when used, shall be traceable to the batches of base compound and curing agent.4.3.1.2 Initial and Final Acceptance TestsEach batch shall be subjected to both initial and final acceptance testing. Sufficient material for initial acceptance testing shall be packaged in the same ty
31、pe containers that are being procured. Initial acceptance tests are those listed in Table 2. SAE INTERNATIONAL AMS3381 Page 5 of 7After 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
32、final acceptance testing. Final acceptance testing is to be conducted on the final packaged product and consist of those tests outlined in Table 3.4.3.1.2.1 Final Acceptance Test OptionIf the batch is being packaged in different types and/or size containers, the final acceptance tests shall be condu
33、cted on each type and/or each size containers. If the sealing compound is being procured under different purchase orders, but the purchanse orders call for the same type and size containers it is only necessary to conduct the final acceptance tests one time.4.3.2 Qualification Test SamplesSamples sh
34、all consist of six containers of sealing compound. Purchaser and manufacturer shall agree upon the container size. Samples shall be identified as:SEALING COMPOUND, AIRCRAFT FIREWALL, NON-SILICONEAMS3381Manufacturers Identification _Name of Manufacturer _Batch/Lot Number _Date of Packaging _Shelf Lif
35、e Expiration Date _Store below 80 F (27 C)4.3.3 Shelf-Life Surveillance and Updating4.3.3.1 SamplingAn inspection lot shall consist of items produced by a single manufacturer and bearing the same lot or batch identification number. The minimum number of samples to be tested from each inspection shal
36、l be in accordance with AS5502 (4.1.2)4.4 Test Methods4.4.1 Standard TolerancesUnless otherwise specified herein, standard tolerances of AS5127 (3) “Standard Tolerances” shall apply.4.4.2 Standard Test ConditionsShall be in accordance with AS5127 (4).4.4.3 Preparation of Test SpecimensTest specimens
37、 shall be prepared in accordance with AS5127 (6) unless otherwise specified herein.4.4.3.1 Cleaning of Test PanelsTest panels shall be cleaned in accordance with AS5127 (6).4.4.3.2 Preparation of Peel Strength Test PanelsTest panel configuration shall be in accordance with AS5127/1 (8) “Peel Strengt
38、h Properties” and (8.1) “Peel Strength Testing” and as in Figure 22 “Five-Inch Peel Specimen Configuration”.4.4.4 Application of Adhesion PromoterWhen required by the sealant manufacturer, apply the recommended adhesion promoter in accordance with AS5127 (6.9)“Application of Adhesion Promoter”. Any
39、adhesion promoter used for qualification must be documented and will be included on any qualification approval documentation.SAE INTERNATIONAL AMS3381 Page 6 of 74.4.5 Application of Sealing CompoundUnless otherwise specified herein, freshly mixed or opened sealing compound shall be applied to test
40、panels in accordance with AS5127 (6.10) “Application of Sealing Compound”.4.4.6 Curing of Sealing CompoundShall be in accordance with AS5127 (6.11) “Curing of Sealing Compounds”. The sealing compound shall be cured at standard conditions for 14 days for qualification and preproduction testing. An ac
41、celerated cure of 24 hours at standard conditions (4.4.2) plus 4 hours at 120 F (49 C) may be used for acceptance testing. 4.5 Test ProceduresStandard 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 afore
42、mentioned documents, the text of this document takes precedence.4.5.1 Oil ResistancePrepare two 0.040 x 2.75 x 6 inches (1.0 x 69.8 x 152 mm) panels of AMS-QQ-A-250/5 aluminum alloy anodized per AS5127 (6.3). Apply two 0.188 x 0.75 x 5 inches (4.76 x 19 x 127 mm) parallel strips of sealing compound;
43、 each strip shall extend to within 0.5 inch (13 mm) of the edge of the panel. After cure of sealing compound, immerse panels vertically in AMS3021 fluid at 140 F (60 C) for 72 hours. Examine sealing compound to requirements of Table 1 (3.6.9).4.5.2 Corrosion ResistancePerform in accordance with AS51
44、27/1 (7.9), except substitute a 3% NaCl in distilled water solution for the AMS2629 Type I / 3% NaCl conditioning fluid solution and cured test fillet shall be 0.062 + 0.003/ -0.000 inch (1.57 +0.07/-0.00 mm) thick Note: Use of an adhesion promoter is allowed only if recognized within this document
45、and included in the qualification test report. 4.6 ApprovalShall be in accordance with AS5502 (4.4).4.7 ReportsShall be in accordance with AS5502 (4.5).4.8 Resampling and RetestingShall be in accordance with AS5502 (4.6).4.9 QualificationShall be in accordance with AS5502 (4.7).5. PREPARATION FOR DE
46、LIVERYShall be in accordance with AS5502 (5).6. ACKNOWLEDGEMENTShall be in accordance with AS5502 (6).7. REJECTIONSShall be in accordance with AS5502 (7).SAE INTERNATIONAL AMS3381 Page 7 of 78. NOTES8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas
47、where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, or in docu
48、ments that contain editorial changes only.8.2 Qualification of Sealing CompoundShall be in accordance with AS5502 (4.7).8.3 Properties are divided into two classes: performance (acceptance tests) and application (preproduction or qualification tests) requirements. Performance requirements define those properties of the cured sealant and its performance in service. Application requirements define those properties of the uncured sealant and affect the application parameters of the sealant.
