SAE AMS 3266A-2017 Sealing Compound Polythioether Elastomeric Two-Part Electrically Conductive.pdf

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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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p

3、ublication 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: +1 724-776-497

4、0 (outside USA) 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:/standards.sae.org/AMS3266A AEROSPACE MATERIAL SPECIFICATION AMS3266 REV. A Issued 1989-10 Revised 2017-02 Superse

5、ding AMS3266 Sealing Compound, Polythioether Elastomeric Two-Part Electrically Conductive RATIONALE Specification review and update to incorporate current customer requirements and product performance capabilities. Adds types for chromated and non-chromated sealants, and updates electrical propertie

6、s and shelf life requirements to match product performance. Changed standard and accelerated curing times to provide more consistent testing. 1. SCOPE 1.1 Form This specification covers two types of electrically conductive, elastomeric polythioether sealing compounds that cure at room temperature. T

7、he sealing compound is supplied as either a two-component system or as premixed and frozen. 1.2 Application These materials primarily provide an electrically conductive sealant or metal joint interface for shielding purposes. They have been used in aircraft to provide an electrically conductive path

8、 in faying surface seals as well as overcoating of fasteners and sealing of seams and joints along with providing an effective corrosion barrier. They have a continuous service use from -65 to +250F (-54 to +121C). The cured sealant materials are resistant to exposure to both jet fuel and aviation g

9、as. 1.3 Classification 1.3.1 Types Type 1 - Contains chromate type corrosion inhibitors. Type 2 - Contains non-chromate type corrosion inhibitors. 1.3.2 Classes Class B - Suitable for application by extrusion gun or spatula. Available with the following application times in hours: B-1 B-2 1.4 Safety

10、 - Hazardous Materials Shall be in accordance with AS5502 (1.1). SAE INTERNATIONAL AMS3266A Page 2 of 12 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work t

11、o a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commo

12、nwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2629 Fluid, Jet Reference AMS-S-8802 Sealing Compound, Fuel Resistant, Integral Fuel Tanks and Fuel Cell Cavities AS5127 Aerospace Standard Test Methods for Aerospace

13、 Sealants Methods for Preparing Aerospace Sealant Test Specimens AS5127/1 Aerospace Standard Test Methods for Aerospace Sealants, Two-Component Synthetic Rubber Compounds AS5502 Standard Requirements for Aerospace Sealants and Adhesion Promoters 2.2 U.S. Government Publications Copies of these docum

14、ents are available online at http:/quicksearch.dla.mil. MIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Number O-156 MIL-PRF-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Metric, NATO Code Number H-537 2.3 NAS Publications Available from Aerospa

15、ce Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928, Tel: 703-358-1000, http:/www.aia-aerospace.org/ NAS705 Terminal, Stud-Turret, Single End, Midget 2.4 ASTM Publication Available from ASTM International, 100 Barr Harbor Drive, P.O. C700, West Conshohocken, PA 194

16、28-2959, Tel. 610-832-9585, www.astm.org ASTM B117 Standard Practice for Operating Salt Spray (Fog) Apparatus ASTM B221 Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes 2.5 PRI Publications Available from Performance Review Institute, 161 Thorn Hi

17、ll Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org. PD2103 Aerospace Quality Assurance, Product Standards, Qualification Procedure, Sealants PRI-QPL-AMS3266 Products Qualified Under AMS3266 SAE INTERNATIONAL AMS3266A Page 3 of 12 3. TECHNICAL REQUIREMENTS 3.1 Materials The ba

18、sic ingredient shall be synthetic rubber, made from polythioether polymer, and shall contain nickel filler and corrosion inhibitors suitable to the designated Type. The sealing compound shall cure by the addition of a separate curing agent to the base compound and shall not depend on solvent evapora

19、tion for curing. The curing agent shall contain either manganese dioxide curative or epoxy curative, and possess sufficient color contrast to the base compound to permit easy identification of an unmixed or incompletely mixed sealing compound. Neither the base compound nor the cured sealing compound

20、 shall be red or pink in color. 3.1.1 Adhesion Promoter The Adhesion Promoter shall be an air drying liquid and shall be included as part of the package with the base compound. 3.2 Date of Packaging Shall be in accordance with AS5502 (3.1). 3.3 Toxicological Formulations Shall be in accordance with

21、AS5502 (3.2). 3.4 Quality Shall be in accordance with AS5502 (3.3). 3.5 Shelf Life Shelf life shall be a minimum of 6 months from the date of packaging when stored at 40 F to 60 F (4 C to 16 C) in the original unopened containers, with intermittent temperature excursions allowed during shipment. The

22、 manufacturer may recommend storage at lower temperatures to preserve application and handling properties. Material may be retested for shelf life extension per 4.3.3. 3.5.1 Premixed and Frozen Material Premixed and frozen material shall have a minimum storage life of 30 days at -80 F (-62 C) or low

23、er from date of mix/freeze. The date of mix/freeze shall be within the shelf life of the unmixed material. 3.6 Properties The base compound and the curing agent, when mixed in accordance with manufacturers instructions and cured in accordance with 4.5.3.5, shall conform to the requirements shown in

24、Table 1, when determined in accordance with the specified test methods. SAE INTERNATIONAL AMS3266A Page 4 of 12 Table 1 - Properties Paragraph Property Requirement Test Procedures (Paragraph) 3.6.1 Nonvolatile Content, by weight, min 92% AS5127/1 (5.1) 3.6.2 Application Time, min AS5127/1 (5.6) From

25、 beginning of mixing, not less than 15 g/min shall be extruded. B-1 B-2 1 hour 2 hours AS5127/1 (5.6.2) 3.6.3 Tack-Free Time (Measured from beginning of mixing), max B-1 B-2 10 hours 24 hours AS5127/1 (5.8) 3.6.4 Standard Cure Time (time to reach 30 Durometer A), max B-1 B-2 72 hours 72 hours AS5127

26、/1 (5.9) 3.6.5 Specific Gravity 1.9 2.25 AS5127/1 (6.1) 3.6.6 14 Day Hardness, Durometer Shore A, Instantaneous, min 40 AS5127/1 (6.2) 3.6.7 Hydrolytic Stability, min 40 Shore A AS5127/1 (6.6) 3.6.8 Thermal Stability, 48 hours at 250 F (121 C) No blistering or sponging; hardness shall not deviate mo

27、re than 15 from initial AMS3266 (4.6.3) 3.6.9 Low Temperature Flexibility No visual evidence of cracking, checking or loss of adhesion AMS3266 (4.6.2) and AS5127/1 (7.6) 3.6.10 Electrical Contact Resistance AMS3266 (4.6.1) 3.6.10.1 Initial, max, Type 1 Initial, max, Type 2 0.05 0.5 3.6.10.2 After 10

28、00 hours Salt Spray, max 1.0 3.6.11 Tensile Strength and Elongation, min AS5127/1 (7.7) 3.6.11.1 Standard Cure 50 psi (345 kPa)/40% 3.6.11.2 Standard cure plus 48 hours at 140 F (60 C) in AMS2629, Type 1 50 psi (345 kPa)/40% 3.6.11.3 Standard cure plus 48 hours at 140 F (60 C) in MIL-PRF-23699 50 ps

29、i (345 kPa)/40% SAE INTERNATIONAL AMS3266A Page 5 of 12 Table 1 Properties (Continued) Paragraph Property Requirement Test Procedures (Paragraph) 3.6.11.4 Standard cure plus 24 hours at 250 F (121 C) in MIL-PRF-23699 50 psi (345 kPa)/40% 3.6.11.5 Standard cure plus 48 hours at 140 F (60 C) in MIL-PR

30、F-83282 50 psi (345 kPa)/40% 3.6.12 Shear Strength, min 40 psi (276 kPa), 95% cohesive failure AS5127/1 (7.8) 3.6.13 Corrosion Resistance 3.6.13.1 Type 1 No pitting corrosion under conductive sealant AMS3266 (4.6.4) 3.6.13.2 Type 2 No corrosion or signs of deterioration under the sealant AS5127/1 (7

31、.9) 3.6.14 Storage Stability 3.6.14.1 Accelerated Storage AS5127/1 (9.1) Storage time shall be 7 days at 120 F (49 C) 3.6.14.1.1 Appearance No skinning, hardening or separation that cannot be restored by normal agitation 3.6.14.1.2 Application Time, min From beginning of mixing, not less than 5 g/mi

32、n shall be extruded. B-1 B-2 1 hour 2 hours AS5127/1 (5.6) AS5127/1 (5.6.2) 3.6.14.1.3 Tack Free Time Same as 3.6.3 3.6.14.1.4 Standard Cure Time Same as 3.6.4 3.6.14.2 Long Term Storage AMS3266 (4.6.5) 3.6.14.2.1 Appearance No skinning, hardening or separation that cannot be restored by normal agit

33、ation 3.6.14.2.2 Application Time Same as 3.6.14.1 3.6.14.2.3 Tack-Free Time Same as 3.6.3 3.6.14.2.4 Standard Cure Time Same as 3.6.4 SAE INTERNATIONAL AMS3266A Page 6 of 12 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection Shall be in accordance with AS5502 (4.1). 4.1.1 Source Insp

34、ection Shall be in accordance with AS5502 (4.1.1). 4.1.2 Sampling and Testing Shall be in accordance with AS5502 (4.3). 4.2 Classification of Tests Shall be in accordance with AS5502 (4.2). 4.2.1 Qualification Tests Shall be in accordance with AS5502 (4.2.1). 4.2.1.1 Qualification Requirements for C

35、lass B-2 Class B-2, if available, shall be the first material that is qualified for each supplier of sealing compound. Class B-2 sealing compound shall be tested for, and shall meet all technical requirements of this specification with the exception of requirements unique to other application times

36、or Types of the sealing compound. 4.2.1.2 Qualification Requirements for Other Application Times Once qualification for Class B-2 has been obtained (or B-1 if no B-2 exists), other application times of qualified classes may be qualified. The formulation for other application times of qualified class

37、es shall be the same as Class B-2 except for minor variations necessary for conformance to application time requirements. All compounds shall meet all technical requirements of this specification. Application times of qualified classes need only to be tested to the initial acceptance tests listed in

38、 4.2.2 and other tests as defined by the QPL agency. Any unique qualification tests for the sealants application time shall also be tested per PD2103. 4.2.2 Initial Acceptance Tests Requirements shown in Table 2 are initial acceptance tests and shall be performed on each batch in accordance with AS5

39、502 (4.2.2.1). Table 2 - Initial acceptance tests Test Requirement Paragraph Application Time 3.6.2 Tack-Free Time 3.6.3 Standard Cure Time 3.6.4 Electrical Contact Resistance, Initial only1 3.6.10.1 NOTE 1: For acceptance tests, sealant may be subjected to an accelerated cure per 4.5.3.5. 4.2.3 Fin

40、al Acceptance Tests Requirements shown in Table 3 are final acceptance tests and shall be performed on each lot in accordance with AS5502 (4.2.2.2). SAE INTERNATIONAL AMS3266A Page 7 of 12 Table 3 - Final Acceptance Tests Test Requirement Paragraph Application Time 3.6.2 Tack-Free Time 3.6.3 Standar

41、d Cure Time 3.6.4 4.3 Sampling and Testing Shall be in accordance with AS5502 (4.3). 4.3.1 Qualification Tests Samples shall be produced using production scaled equipment. Enough material shall be supplied to perform all required tests. Samples shall be identified as specified herein and below: SEAL

42、ING COMPOUND, POLYTHIOETHER ELASTOMERIC TWO-PART ELECTRICALLY CONDUCTIVE AMS3266A TYPE AND CLASS MANUFACTURERS IDENTIFICATION _ BATCH/LOT NUMBER_ DATE OF PACKAGING _ SHELF LIFE EXPIRATION DATE _ STORE BEETWEEN 40 F (4 C) AND 60 F (16 C) 4.3.2 Acceptance Tests Shall be in accordance with AS5502 (4.3.

43、1). 4.3.2.1 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 material from one batch of each component assembled (packaged) as finished product in one size and/or type of container at the same time. The lot, when us

44、ed, shall be traceable to the batches of base compound and curing agent. 4.3.2.2 Initial and Final Acceptance Tests Each batch shall be subjected to both initial and final acceptance testing. Initial acceptance tests are those listed in Table 2. After successful completion of the initial acceptance

45、tests, the batch shall be released for final packaging. During packaging, test kits shall be selected at random for final acceptance testing. Final acceptance testing is to be conducted on the final packaged product and consist of those tests outlined in Table 3. 4.3.2.3 Final Acceptance Tests for D

46、ifferent Types and/or Size Containers If the batch is being packaged in different types and/or size containers, the final acceptance tests shall be conducted on each type and/or each size containers. If the sealing compound is being procured under different purchase orders, but the purchase orders c

47、all for the same type and size containers, it is only necessary to conduct the final acceptance tests one time. 4.3.3 Shelf Life Extension 4.3.3.1 Shelf-Life Testing The tests to be conducted for shelf-life extensions are listed in Table 4. SAE INTERNATIONAL AMS3266A Page 8 of 12 Table 4 - Shelf-lif

48、e testing Test Requirement Paragraph Application Time 3.6.14.1 Tack-Free Time 3.6.3 Standard Cure Time 3.6.4 Electrical Contact Resistance, Initial only1 3.6.10.1 NOTE 1: For shelf life testing, sealant may be subjected to an accelerated cure per 4.5.3.5. 4.3.3.2 Time and Limits of Shelf Life Extensions If the tests are performed at the end of the stated shelf life to update the shelf life of the sealing co