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 2012 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/AMSR7362A AEROSPACE AEROSPACE MATERIAL SPECIFICATION AMS-R-7362 REV. A Issued 1998-06 Reaffir
5、med 2005-05 Revised 2012-12 Superseding AMS-R-7362 Nitrile Rubber, Synthetic, Solid, Sheet, Strip and Fabricated Parts, Synthetic Oil Resistant RATIONALE To correct errors from the previous revision and update the specification references for the five year review. NOTICE The initial SAE publication
6、of this document was taken directly from U.S. Military Standard MIL-R-7362D, Amendment 4. This SAE Standard may retain the same part numbers established by the original military document. Any requirements associated with Qualified Products Lists (QPL) may continue to be mandatory for DoD contracts.
7、Requirements relating to QPLs have not been adopted by the SAE for this standard and are not part of this SAE document. 1. SCOPE 1.1 This specification covers two types of synthetic rubber for use where resistance to diester synthetic oils is required. This material may not be suitable for use in po
8、lyol ester based turbine oils. 1.2 Classification Synthetic rubber shall be of the following types, as specified (See 6.3): Type I - O-rings Type II - Molded parts (other than O-rings), sheets, strips, and extruded shapes 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the
9、date of the purchase order forms 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 cancelled and no superseding document has been specified, th
10、e last published issue of that document shall apply. SAE AMS-R-7362A Page 2 of 15 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. AMS2817 Packing and Identi
11、fication Preformed Packings AMS3021 Fluid, Reference for Testing Di-Ester (Polyol) Resistant Material AMS6345 Steel SAE 4130 Normalized or Otherwise Heat Treated AMS7276 Rings, Sealing, Fluorocarbon Rubber High Temperature AMS-QQ-A-250/4 Aluminum Alloy 2024, Plate and Sheet ARP5316 Storage of Aerosp
12、ace Elastomeric Seals AS29561 Packings, Preformed, O-ring, Synthetic Lubricant Resistant AS5752 Visual Inspection Standard for Elastomeric Sealing Elements Other than O-rings 2.2 ANSI Publications Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel
13、: 212-642-4900, www.ansi.org. ANSI/ ASQ Z1.4 Sampling Procedures and Tables for Inspection by Attributes 2.3 ASME Publications Available from American Society of Mechanical Engineers, 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900, Tel: 973-882-1170, www.asme.org. ASME B46.1 Surface Texture (
14、Surface Roughness, Waviness separator sheets do not fully cover the full area of contact between the sheets. Stacked over 10 inches high. (Strips) Not in rolls; not wound on suitable cores. Rolls not wrapped or sealed as specified. Total length per roll varies by more than the indicated tolerances (
15、5.1.1.2.2). Packing Not level specified; not in accordance with contract requirements. Container not as specified, closures not accomplished by specified or required methods or materials. Any nonconforming component, component missing, damaged or otherwise defective, affecting serviceability. Inadeq
16、uate application of components, such as incomplete closure of case liners, containing flaps loose or inadequate strapping, bulged or distorted containers. Count Less than specified or indicated quantity, linear footage, or units, as applicable. Weight Gross weight exceeds specified requirements. Mar
17、kings Interior or exterior markings, as applicable, omitted, illegible, incorrect, incomplete, or not in accordance with contract requirements (See 5.3). Date of cure, storage instructions missing (See 5.3.1). The sample size shall be in accordance with inspection level II of ANSI/ ASQ Z1.4 and the
18、acceptable quality level (AQL) shall be 2.5. 4.4.6 Quality Conformance Tests The following tests shall be conducted on each lot of material: TABLE 6 Original Air aged Tensile strength Elongation Hardness 22 hours at 257 F 2 Compression set If the items are unsuitable for use as test samples, tests s
19、hall be performed on samples of identical composition and state of cure as the end item. SAE AMS-R-7362A Page 10 of 15 4.4.6.1 Rejection Criteria A lot shall be rejected upon the failure of any sample to meet the test requirements specified herein. 4.5 Test Conditions 4.5.1 Control Fluid The control
20、 fluid used to conduct the oil aging in this specification shall be in accordance with AMS3021. It consists of a MIL-PRF-7808 standard production base fluid plus 0.5 percent phenothiazine. New fluid shall be used for each aging test. 4.5.2 Atmospheric Conditions All fluid cooling, conditioning, and
21、physical property determinations of rubber shall be conducted in an atmosphere of 50 percent 15 relative humidity and at a temperature of 75 F 5. 4.6 Test Methods 4.6.1 Corrosion and Adhesion Test 4.6.1.1 Corrosion and Adhesion Material shall be prepared for corrosion testing by inserting sufficient
22、 quantities in a desiccator or similar humidity chamber maintained at 92 percent minimum relative humidity and room temperature for 72 hours minimum. Metallic plates of the metals listed below shall be polished to a surface roughness of 4 to 16 RHR finish in accordance with ASME B46.1-85. The edges
23、shall also be polished to reduce the formation of edge corrosion. The plates shall be washed with toluene or aliphatic naphtha, or similar degreasing agent that will produce a clean dry surface free from film. The metals used shall be as follows: Aluminum alloy: AMS-QQ-A-250/4 Brass: ASTM B 36 Phosp
24、hor bronze: ASTM B 139 Steel: SAE AMS6345 Normalized or Otherwise Heat Treated 4.6.1.2 Immersion of Rubber Material and Metallic Plates The humidified rubber material and the metallic plates shall be immersed in type I fluid of MIL-PRF-6083, and drained to the drip point. The rubber material and pla
25、tes shall then be so laid together in a stack that at least two rubber pieces contact each specified metal. The stack shall be held together with a pressure of 20 to 30 pounds and placed in a desiccator which is maintained at 90 to 92 percent relative humidity at room temperature. A separate set of
26、metallic plates shall also be prepared (buffing, cleaning, and dipping in rust-preventive fluid and drained) and placed in this desiccator in such a manner that the control plates do not touch each other or any of the rubber. NOTE: di-potassium acid phosphate K2HPO4, when placed in distilled water i
27、n sufficient quantity to produce a concentrated solution, will maintain approximately 92 percent humidity in a sealed desiccator at 68 F temperature.) Test time shall be 14 days. No more than 15 minutes should elapse between the time the test samples are removed from the prehumidifying chamber and p
28、laced in the stacked condition in the second humidity chamber. 4.6.1.3 Inspection at the Termination of the Test At the termination of this test, there shall be no adhesion of the rubber material to the metals. There shall be only slight evidence of pitting, erosion, corrosion, or bad discoloration
29、on the plates, as shown by the following procedure, unless metallic plates are entirely unaffected by the test: SAE AMS-R-7362A Page 11 of 15 4.6.1.3.1 The surfaces of the plates that were in contact with the packings shall be inspected for discoloration, deposits, pitting, etc. If any exists, the s
30、urfaces of the plates shall be washed in precipitation naphtha. Deposits determined as rubber compounds or elements therefrom, which can be removed by this process and which do not occur on the separate control plates, shall be construed as adhesion. 4.6.1.3.2 If any other marks remain on the surfac
31、es of the plates after step (a) above, the surfaces shall be lightly polished with a nonabrasive cloth buff. Any pits or eroded marks remaining after this process shall be construed to be corrosion. Discoloration or staining (marks which do not physically affect the surface of the plates and which e
32、asily wash or buff off) shall not be considered detrimental. If any doubt should arise about the presence of pitting, erosion, or corrosion on the metal plates, a microscope of approximately 10 to 15 power magnification shall be used to determine the actual condition. 4.6.2 Physical Properties Unles
33、s otherwise specified, the following physical properties shall be determined in accordance with the ASTM test methods for rubber products: TABLE 7 Property ASTM method Hardness Tensile strength and elongation Type I Type II 1/ Volume change Specific gravity D 2240 D 1414 D 412 D 471 D 297, Hydrostat
34、ic method 1/ Die “C” shall be used for type II materials. 4.6.2.1 Temperature Retraction (TR-10) The temperature retraction test shall be conducted in accordance with ASTM D 1329. Three O-ring specimens as specified in 4.3.1 shall be used for type I and shall be elongated 50 percent in accordance wi
35、th the rod markings. The temperature retraction test type II shall be conducted on three 2-inch or 1-inch specimens. 4.6.3 Air Aging Air aging shall be conducted in accordance with ASTM D 573, except that the aging time and temperature shall be in accordance with Table 2. 4.6.4 Oil Aging Oil aging o
36、f specimens shall be conducted in clean 39 millimeters (mm) OD by 300 mm pyrex glass test tubes fitted with 2-hole cork stoppers. Each stopper shall be fitted with 2 lengths of 8 mm pyrex glass tubing (chimneys), one 3 inches in length, the other 5 inches in length. The 3-inch chimney shall extend t
37、hrough and 1/2 inch above the top of the stopper. The 5-inch chimney shall extend through and 3-1/2 inches above the top of the stopper. An aluminum block heater shall be used for aging the specimens. Use of an oil bath is permissible but is not desired. For each test, 140 milliliters (ml) of oil sh
38、all be used. The test tubes shall be inserted into the aluminum block or oil bath in such manner that the fluid level in the test tubes shall be approximately 1-5/8 inches above the heating unit of the aluminum block or surface of the oil bath. This distance shall not be measured from the top of the
39、 aluminum block or covering of the oil bath. The specimens shall be suspended in the oil by soft iron or nichrome wire hangers as follows: 4.6.4.1 Type I: Three specimens shall be suspended horizontally in the fluid, one each at depths of 1-1/2 inches, 3-1/2 inches, and 5-1/2 inches below the surfac
40、e of the fluid. Hardness specimens shall be placed in a separate chimney stoppered tube keeping approximately the same rubber to oil ratio. SAE AMS-R-7362A Page 12 of 15 4.6.4.1.1 Type II: Four dumbbells cut with a die “C”, conforming to ASTM D 412, shall be tested. There shall be only two specimens
41、 aged in a single test tube. The specimens shall be suspended vertically in the fluid, one each at depths of 1 inch and 2 inches below the surface of the fluid. The measurement of specimen depth in the fluid shall be made between the top edge of the specimen and the fluid level. Care shall be taken
42、to prevent contact of specimens with each other or the wall of the test tube. 4.6.4.1.2 The oil-aging time and temperature shall be 70 hours at 257 F 2. After aging and prior to the physical property determinations, the specimens shall be removed from the hot fluid and cooled 30 minutes in fresh flu
43、id. Tensile strength, elongation, hardness, volume change, and temperature retraction (TR-10) shall then be determined as specified in 4.6.2 and 4.6.2.1. 4.6.4.2 Cracking Test For type I material, three oil-aged O-rings shall be rolled onto a smooth surface cone. The base of the cone shall be 2-1/2
44、inches in diameter. The height of the cone shall be 10 inches. The diameter at which cracking first appears shall be measured and recorded. For type II material, three aged dumbbells or strips 1/4 inch wide shall be cut from sheet stock and used for this test. Each specimen or type II material shall
45、 be bent back 180 degrees upon itself. 4.6.4.3 Compression Set Except where otherwise specified, compression set shall be determined in accordance with ASTM D 395 Method B. Specimens for type I material shall be two O-rings. Type II material shall use two circular specimens of plied-up sheets with d
46、imensions of 1.129 0.001 diameter and approximately 0.5 inch thickness. The compression set plates for the O-rings shall be approximately 0.375 inch by 2 inches by 4 inches. There shall be six 1/4-inch bolt holes; one on each corner and one located in the middle of each 4-inch edge and on the center
47、 line of the corner holes. There shall also be 1/4 inch holes through the middle of each half of the plates to allow fluid to be in contact with the inside diameter of the O-rings. The compression set plates for type II material shall be in accordance with ASTM D 395. The original thickness of the s
48、pecimens shall be measured and the test fixtures shall be assembled using two test specimens. The specimens shall be compressed 25 percent. The test fixture shall be placed in a 1-liter stainless steel beaker and 800 milliliters of AMS3021 shall be added to the beaker. The beaker shall be fitted wit
49、h a suitable vented stainless steel cap. The cap shall be sealed with an O-ring conforming to AMS7276 (size-240 has been used). The beaker shall be placed in a suitable oven at 257 F 2 with vent open. After the fluid has reached the test temperature (approximately 2 hours) the vent shall be closed and the beaker left in the oven for a total aging time of 70 hours. At the end of the aging time the specimens shall be remo
