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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2008 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AMS3276E AEROSPACE MATERIAL SPECIFICATION Issued 1993-10 Revised 2008-03 Superseding AMS3276D Sealing Compound, Integral Fuel Tanks and General Purpose, Intermittent Use to 360 F (182 C) RATIONALE AMS3276E results fro
5、m a Five Year Review and update of this specification. Also changing from clad to alloy aluminum to be consistent with actual use. 1. SCOPE 1.1 Form This specification covers five classes of a fuel-resistant polysulfide (T) sealing compound supplied as a two-component system. 1.2 Application This se
6、aling compound has been used typically for fuel tank sealing, cabin pressure sealing, and aerodynamic smoothing, but usage is not limited to such applications. It can be used for faying surface sealing, wet-installation of fasteners, overcoating fasteners, sealing joints and seams, and nonstructural
7、 adhesive bonding. This room-temperature curing sealing compound can be used in fuel areas as well as nonfuel areas. Curing of this material can be accelerated at higher temperatures. This material is usable from -65 to 250 F (-54 to 121 C), with short-term exposure (approximately six hours) to 360
8、F (182 C). 1.2.1 Notation AMS3100 adhesion promoter should be applied prior to the sealant. 1.3 Classification Sealing compounds covered by this specification are classified as follows: Class A - Suitable for application by brush. Available with the following application times in hours: A-1/2 A-2 A-
9、4 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 3276E - 2 - Class B - Suitable for application by extrusion gun or spatula. Used primarily for fillet sealing, injection sealing, prepack sea
10、ling, and rework of damaged fillet seals. Available with the following application times in hours: B-1/4 B-1/2 B-1 B-2 B-4 B-6 B-12 Class C - Suitable for application by brush, extrusion gun, roller or spatula. Used mostly for fay surface sealing and wet installation of fasteners. Available with the
11、 following application times in hours: Notation: ( ) Assembly time in hours, where indicated. C-1/2 C-2 C-8(20) Class D - Suitable for application by extrusion gun or spatula. Used for hole and void filling, or for other applications where a very thick sealant is required. Available with the followi
12、ng application times in hours: D-1/4 D-1/2 Class E - Suitable for application by automatic riveting equipment. Available with the following application time in hours: E-6 1.4 Precautions 1.4.1 Safety - Hazardous Materials Shall be in accordance with AS5502 (1.1). 2. APPLICABLE DOCUMENTS Shall be in
13、accordance with AS5502 (2.). 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.sae.org. AMS2471 Anodic Treatment of Aluminum Alloys, Sulfuric Acid Process, Undyed Coat
14、ing AMS2629 Fluid, Jet Reference Fluid AMS3020 Oil, Reference, for “L” Stock Rubber Testing AMS3021 Fluid, Reference, for Testing Diester (Polyol) Resistant Material AMS3100 Adhesion Promoter, for Polysulfide Sealing Compounds AMS3276 Sealing Compound, Integral Fuel Tank and Fuel Cell Cavities, Inte
15、rmittent Use to 360 F (182 C) AMS4045 Aluminum Alloy Sheet and Plate, 5.6 Zn - 2.5Mg - 1.6 Cu - 0.23 Cr (7075 -T6 Sheet, T651 Plate), Solution and Precipitation Heat Treated AMS4911 Titanium Sheet, Strip and Plate, 6Al, 4V Annealed AMS5516 Steel, Corrosion Resistant, Sheet, Strip, and Plate, 18Cr -
16、9.0Ni (SAE 30302) Solution Heat Treated AMS-C-27725 Coating, Corrosion Preventive, for Aircraft Integral Fuel Tanks Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 3276E - 3 - ARP1917 Clarifi
17、cation of Terms Used in Aerospace Metals Specifications AS5127 Methods for Testing Aerospace Sealants AS5127/1 Methods for Testing Aerospace Sealants, Two-Component Synthetic Rubber Compounds AS5502 Standard Requirements for Aerospace Sealants 2.2 U.S. Government Publications Available from the Docu
18、ment Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. MIL-PRF-23377 Primer Coatings: Epoxy Polyamide, Chemical and Solvent Resistant MIL-DTL-81706 Chemical Conversion Materials for Coat
19、ing Aluminum and Aluminum Alloys MIL-PRF-85285 Coating, Polyurethane, High Solids MIL-PRF-85582 Primer Coatings, Epoxy, Waterborne 2.3 PRI Publications Available from Performance Review Institute, 161 Thorn Hill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org. PD 2000 Procedu
20、res for an Industry Qualified Product Management Process PRI-QPL-AMS-3276 Products Qualified Under AMS3276 2.4 Definitions See AS5502 (2.3) 3. TECHNICAL REQUIREMENTS 3.1 Materials The basic ingredient shall be synthetic rubber of the polysulfide (T) type. The sealing compound shall cure by addition
21、of a curing agent to the base compound; the curing agent is also called a catalyst or accelerator. Curing of the sealing compound shall not depend on solvent evaporation for curing. The material shall contain no lead compounds. The curing agent shall possess sufficient color contrast to base compoun
22、ds to permit easy identification of an unmixed or incompletely mixed sealing compound. Neither the base compound nor the cured sealant shall be red or pink in color. 3.1.1 Qualification All products sold to this specification shall be listed, or approved for listing, on the qualified products list,
23、PRI-QPL-AMS3276. The qualified products list shall be in accordance with PD 2000. 3.2 Date of Packaging Shall be in accordance with AS5502 (3.1). 3.3 Toxicological Formulations Shall be in accordance with AS5502 (3.2). 3.4 Quality Shall be in accordance with AS5502 (3.3). 3.5 Shelf Life Shelf life s
24、hall be a minimum of 9 months from the date of packaging. Material may be retested for shelf life extension. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 3276E - 4 - 3.5.1 Premixed and Fro
25、zen Material Premixed and frozen material shall have a minimum storage life of 30 days at -40 F (-40 C) or lower, or 10 days at -10 to -40 F (-23 to -40 C) from date of mix/freeze. The date of mix/freeze shall be within the shelf life of the unmixed material. 3.6 Properties The sealing compound and
26、the curing agent shall conform to all requirements shown in Table 1, determined in accordance with the specified test methods. TABLE 1 - PROPERTIES Paragraph Property Requirement Test Procedures (Paragraph) 3.6.1 Nonvolatile Content, by weight, min AS5127/1 (5.1)Class A 85% Class B 96% Class C 92% C
27、lass D 97% Class E 85% 3.6.2 Air Content, max (Class B only) 4% AS5127/1 (5.2) 3.6.3 Viscosity of Base Compound AS5127/1 (5.3) Class A (Use No. 6 spindle 10 rpm) 100 to 600 poises (10 to 60 PaS) Class B(Use No. 7 spindle 2rpm) 9000 to 16000 poises (900 to 1600 PaS) Class C (Use No. 6 spindle 2 rpm)
28、1000 to 4000 poises (100 to 400 PaS) Class D (Use No. 7 spindle 2 rpm) 20,000 to 30,000 poises (2000 to 3000 PaS) Class E (Use No. 7 spindle 10 rpm) 300 to 800 poises (30 to 80 PaS) 3.6.4 Viscosity of Curing Agent (Use No. 7 spindle 10 rpm) 700 to 2500 poises (70 to 250 PaS) AS5127/1 (5.4) 3.6.5 Flo
29、w Class B (Class B-2: see Notes 1 and 2.) 0.1 to 0.75 inches (2.5 to 19.0 mm) AS5127/1 (5.5) AS5127/1 (5.5.1) Class C 0.010 inch (0.25 mm), min AS5127/1 (5.5.2) Class D 0.20 inch (5.1 mm), min AS5127/1 (5.5.1) 3.6.6 Application Time, min AS5127/1 (5.6) Class A - From the beginning of mixing, the vis
30、cosity shall not exceed 2500 poise (250 PaS), (Use No. 7 spindle 10 rpm) Class A-1/2 Class A-2 Class A-4 1/2 hour 2 hours 4 hours AS5127/1 (5.6.1) Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE
31、AMS 3276E - 5 - TABLE 1 - PROPERTIES (CONTINUED) Paragraph Property Requirement Test Procedures (Paragraph) 3.6.6 (cont) Class B - From the beginning of mixing, not less than 15 grams per minute shall be extruded. Class B-1/4 Class B-1/2 Class B-1 Class B-2 (see Notes 1 and 2) Class B-4 Class B-6 Cl
32、ass B-12 1/4 hour 1/2 hour 1 hour 2 hours 4 hours 6 hours 12 hours AS5127/1 (5.6.2) Class C - From the beginning of mixing, not less than 30 grams per minute shall be extruded Class C-1/2 Class C-2 Class C-8(20) 1/2 hours 2 hours 8 hours AS5127/1 (5.6.2) Class D - From the beginning of mixing, not l
33、ess than 15 grams per minute shall be extruded. Class D-1/4 Class D-1/2 1/4 hour 1/2 hour AS5127/1 (5.6.2) Class E - From the beginning of mixing, the viscosity shall be between 800 to 1100 poise (80 to 110 PaS), (Use No. 7 spindle 10 rpm) Class E-6 6 hours AS5127/1 (5.6.1) 3.6.7 Assembly Time (Clas
34、s C only) Class C-8(20) 20 hours AS5127/1 (5.7) 3.6.8 Tack-Free Time (Measured from beginning of mixing), hours, max AS5127/1 (5.8)Class A-1/2 10 Class A-2 24 Class A-4 36 Class B-1/4 6 Class B-1/2 10 Class B-1 12 Class B-2 (See Notes 1 and 2) 24 Class B-4 36 Class B-6 48 Class B-12 120 Class C-1/2
35、10 Class C-2 24 Class C-8(20) 96 Class D-1/4 6 Class D-1/2 10 Class E-6 120 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 3276E - 6 - TABLE 1 - PROPERTIES (CONTINUED) Paragraph Property Req
36、uirement Test Procedures (Paragraph) 3.6.9 Standard Cure Time (time to reach 35 Durometer A), hours, max AS5127/1 (5.9)Class A-1/2 30 Class A-2 72 Class A-4 90 Class B-1/4 16 Class B-1/2 30 Class B-1 36 Class B-2 (See Notes 1 and 2.) 72 Class B-4 90 Class B-6 120 Class B-12 240 Class C-1/2 30 Class
37、C-2 72 Class C-8(20) 336 Class D-1/4 16 Class D-1/2 30 Class E-6 240 3.6.10 Fluid Immersion Cure Time, min (Classes A-1/2, B-1/4, B-1/2 only) After 48 hours After 120 hours 25 Shore A 35 Shore A AS5127/1 (5.11) 3.6.11 Specific Gravity, max average 1.65 AS5127/1 (6.1) 3.6.12 14-Day Hardness, min (Not
38、e 3) 40 Durometer A AS5127/1 (6.2) 3.6.13 Radiographic Density AS5127/1 (6.3) Difference between plate and plate plus sealant, max 1.00 Through sealant in the slot, approximately 3.00 3.6.14 Resistance to Thermal Expansion Sealant flush with groove within +0.010 and -0.003 inch (+0.25 and -0.08 mm)
39、at the wide end of the test block and within +0.005 and -0.003 inch (+0.13 and -0.08 mm) at the narrow end. AS5127/1 (6.4) 3.6.15 Heat Reversion Resistance (Classes B, C and E only) The sealant shall not revert to a liquid or paste-like consistency, nor shall it become brittle or lose adhesion. AS51
40、27/1 (6.5) 3.6.16 Hydrolytic Stability 30 Durometer A AS5127/1 (6.6) 3.6.17 Shaving and Sanding (Class B only) No rolling or tearing of the sealant, smooth finish AS5127/1 (6.7) 3.6.18 Paintability No separation from sealant AS5127/1 (6.8) Copyright SAE International Provided by IHS under license wi
41、th SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 3276E - 7 - TABLE 1 - PROPERTIES (CONTINUED) Paragraph Property Requirement Test Procedures (Paragraph) 3.6.19 Weathering No cracking, chalking, peeling or loss of adhesion AS5127/1 (6.9) 3.6.20 Chalking
42、 Slight AS5127/1 (7.1) 3.6.21 Resistance to Thermal Rupture, max (Class A and B only), Oven air aging at 300 F (149 C), 10 psi (69 kPa), 30 minutes 0.156 inch (3.96 mm) No blistering or sponging AMS3276 (4.6.1) and AS5127/1 (7.2)3.6.22 Weight Loss 2 panels in AMS2629 Type I / 3% saltwater; all at 14
43、0 F (60 C) for 7 days 20 lbf/inch (3503 N/m) / 100% cohesive failure AS5127/1 (8.1) 3.6.30.2 Long Term Storage AS5127/1 (9.2) Application Time Same as 3.6.6 Tack-Free Time, hours, max Class A-1/2 20 Class A-2 48 Class A-4 72 Class B-1/4 16 Class B-1/2 20 Class B-1 24 Class B-2 48 Class B-4 72 Class
44、B-6 96 Class B-12 180 Class C-1/2 20 Class C-2 48 Class C-8(20) 144 Class D-1/4 16 Class D-1/2 20 Class E-6 180 Standard Cure Time, hours, max Class A-1/2 40 Class A-2 72 Class A-4 114 Class B-1/4 24 Class B-1/2 40 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo re
45、production or networking permitted without license from IHS-,-,-SAE AMS 3276E - 9 - TABLE 1 - PROPERTIES (CONTINUED) Paragraph Property Requirement Test Procedures (Paragraph) 3.6.30.2 Class B-1 54 (cont.) Class B-2 72 Class B-4 114 Class B-6 144 Class B-12 264 Class C-1/2 40 Class C-2 72 Class C-8(
46、20) 360 Class D-1/4 24 Class D-1/2 40 Class E-6 144 Note 1: Two cartridges of freshly mixed Class B-2 sealing compound shall be held at Standard Conditions to be tested for Flow, Application Time, Tack-Free Time, and Standard Cure Time. These tests shall be run concurrently during the mixing/freezin
47、g process. Note 2: Class B-2 shall be tested using sealing compound which has been freshly mixed, then quick-frozen and thawed in accordance with AS5127/1 (4.4). Note 3: Does not apply for longer work life sealants including Classes B-12; C- 8 (20) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility
48、for Inspection Shall be in accordance with AS5502 (4.1). 4.1.1 Source Inspection Shall be in accordance with AS5502 (4.1.1). 4.1.2 Sampling Shall be in accordance with AS5502 (4.1.2). 4.2 Classification of Tests Shall be in accordance with AS5502 (4.2). 4.2.1 Qualification Tests All technical requir
49、ements listed in Table 1 are qualification tests (See 8.2) and shall be performed on the initial production lot of the sealing compound prior to shipment to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4, and when purchaser deems confirmatory testing to be required. 4.2.1.1 Qualification
