1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and enginee ring sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, 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 invit es your written comments and suggestions.Copyright 1998 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.
3、S.A.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-7154 FAX: (724) 776-0243TO PLACE A DOCUMENT ORDER: (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS: http:/www.sae.org400 Commonwealth Drive, Warrendale, PA 15096-0001AEROS PACE MATERIAL SPECIFIC ATIONSubmitted for recognition as an American National
4、 StandardAMS- R-25988Issued MAR 1998Rubber, Fluorosilicone Elastomer, Oil-and-Fuel-Resistant,Sheets, Strips, Molded Parts, and Extruded ShapesNOTICEThis document has been taken directly from U.S. Military Specification MIL-R-25988B and contains only minor editorial and format changes required to bri
5、ng it into conformance with the publishing requirements of SAE technical standards. The initial release of this document is intended to replace MIL-R-25988B. Any part numbers established by the original specification remain unchanged.The original Military Specification was adopted as an SAE standard
6、 under the provisions of the SAE Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus
7、 voting at the SAE Committee level, and (b) the use of the existing government specification or standard format.Any material relating to qualified product lists has not been adopted by SAE. This material was part of the original military specification and is reprinted here for historic reference onl
8、y.1. SCOPE:1.1 Scope: This specification covers oil-and-fuel-resistant fluorosilicone elastomer rubber sheets, strips, molded parts, and extruded shapes for aeronautical and aerospace applications.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or netw
9、orking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 2 -1.2 Classification: The fluorosilicone elastomer rubber shall be of the following types, classes, and grades, as specified (see 6.2).Type I - O-rings (available only in class 1, grades 60, 70, and 80 and class III, grade 7
10、5).Type II - Molded parts (other than O-rings) sheets, strips, and extruded shapes.Class 1 - General purpose.Grade 40 - Nominal 40 type A durometer hardness, type II, only.Grade 50 - Nominal 50 type A durometer hardness, type II, only.Grade 60 - Nominal 60 type A durometer hardness, type I and II.Gr
11、ade 70 - Nominal 70 type A durometer hardness, type I and II.Grade 80 - Nominal 80 type A durometer hardness, type I and II.Class 2 - High-strength general purpose, type II, only.Class 3 - High modulus, increased temperature resistance, type I and II.2. APPLICABLE DOCUMENTS: The following publicatio
12、ns, of the issues in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein.2.1 U.S. Government Publications: Available from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.TT-S-
13、735 - Standard Test Fluids; Hydrocarbons.UU-P-268 - Paper, Kraft, Untreated Wrapping.PPP-B-601 - Boxes, Wood, Cleated-Plywood.PPP-B-636 - Box, Fiberboard.PPP-T-45 - Tape, Paper, Gummed (Sealing and Securing)MIL-P-4861 - Packing, Preformed, Rubber, Packing, Packaging of.MIL-R-25988/1 - Rubber, Fluoro
14、silicone Elastomer, Oil and Fuel-Resistant, O-rings, Class 1, Grade 70.MIL-R-25988/2 - Rubber, Fluorosilicone Elastomer, Oil and Fuel-Resistant, O-rings, Class 3.MIL-R-25988/3 - Rubber, Fluorosilicone Elastomer, Oil and Fuel-Resistant, O-rings, Class 1, Grade 60.MIL-R-25988/4 - Rubber, Fluorosilicon
15、e Elastomer, Oil and Fuel-Resistant, O-rings, Class 1, Grade 80.MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes.MIL-STD-129 - Marking for Shipment and Storage.MIL-STD-190 - Identification Marking of Rubber Products.MIL-STD-289 - Visual Inspection Guide for Rubber Sheet Mate
16、rial.MIL-STD-298 - Visual Inspection Guide for Rubber Extruded Goods.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 3 -2.1 (Continued):MIL-STD-407 - Visual Inspection Gu
17、ide for Rubber Molded Items.MIL-STD-413 - Visual Inspection Guide for Rubber O-rings.MIL-STD-831 - Test Report, Preparation of.2.2 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 3021 - Reference Fluid for Testing Di-Ester (Polyol) Resistant Material.2.3 A
18、STM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-5094.ASTM D 297 - Chemical Analysis of Rubber Products.ASTM D 395 - Tests for Compression Set of Vulcanized RubberASTM D 412 - Tension Testing of Vulcanized Rubber.ASTM D 471 - Test for Change in Properties of
19、Elastomeric Vulcanizates Resulting fromImmersion in Liquids.ASTM D 573 - Test for Accelerated Aging of Vulcanized Rubber by the Oven Method.ASTM D 624 - Tear Resistance of Vulcanized Rubber.ASTM D 1329 - Evaluation Low-Temperature Characteristics of Rubber and Rubber-LikeMaterials by a Temperature-R
20、etraction Procedure.ASTM D 1414 - Testing of Rubber O-rings.ASTM D 2240 - Test for Indentation Hardness of Rubber and Plastics by Means of a Durometer.2.4 United Freight Classification Rules: Available from Uniform Classification Committee Agent, Tariff Publication Officer, Room 1106, 222 South Rive
21、rside Plaza, Chicago, IL 60606.United Freight Classification Rules or Regulations of Common CarriersCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 4 -3. REQUIREMENTS: 3.
22、1 Specification sheets: The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet.3.2 First article: When specified, a sample shall be subjected to first article inspection (see 4.3 and 6.2).3.2.1 Test report: A test report shall be prepa
23、red for each type, class, and grade. An updated test report shall be prepared whenever a change is made in the materials, processes, or this specification. First article tests over three years old shall not be acceptable.3.3 Materials: The cured compound of fluorosilicone elastomer rubber shall be e
24、ntirely suitable for the intended purpose and shall be of the same composition and quality as the materials used for the first article sample.3.4 Dimensions and tolerances: 3.4.1 Sheets and strips: Unless otherwise specified (see 6.2) sheets and strips shall be supplied in the lengths and widths and
25、 to the length and width tolerances specified in 3.4.1.1 and 3.4.1.2, and the tolerance on thickness shall be as shown in table I. The dimensions and tolerances of shapes cut from sheet and strip shall be as specified on the detail drawings.3.4.1.1 Sheets: The width of sheet material shall be 36 1 i
26、nch (91.4 2.54 cm) and the length shall be 120 inches (3.05 m) 1 percent.3.4.1.2 Strips: The width of strip shall be 4 inches (102 mm) 5 percent and the length shall be 75 feet 1 foot (22.86 m .305 m).3.4.2 Molded parts (excluding O-rings) and extruded shapes (including tubing): Unless otherwise spe
27、cified (see 6.2), dimensions and tolerances of molded parts (excluding O-rings) and extruded shapes (including tubing) shall be as specified on the drawing.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS
28、-,-AMS- R-25988 SAE AMS- R-25988- 5 -3.4.3 O-rings: Dimensions and tolerances of O-rings shall be in accordance with the applicable military specification sheet. Those are as follows:a. Class 1, Grade 60 MIL-R-25988/3 (USAF)b. Class 1, Grade 70 MIL-R-25988/1 (USAF)c. Class 1, Grade 80 MIL-R-25988/4
29、(USAF)d. Class 3 MIL-R-25988/2 (USAF)3.4.4 Color: Unless otherwise specified, material procured to this specification shall be blue. A pigment that can be used is Ferro Blue No. 3247, supplied by Ferro Corporation, 4150 East 56th St., Cleveland, Ohio or 5309 South District Blvd., Los Angeles, Califo
30、rnia. A formula of 1.5 parts of this pigment per 100.0 parts of fluorosilicone is suggested.3 5 Physical properties: The physical properties of the fluorosilicone elastomer rubber shall conform to the values given in tables II and III.TABLE I. Thickness tolerances of sheet and stripNominal thickness
31、 (inch) mm Tolerances (in.) mm.031 and less 0.787 .010 0.254over .031 to .063 inclusive 0.787 to 1.60 .012 0.305over .063 to .125 inclusive 1.60 to 3.18 .016 0.406over .125 to .188 inclusive 3.18 to 4.78 .020 0.508over .188 to .375 inclusive 4.78 to 9.53 .031 0.787over .375 to .563 inclusive 9.53 to
32、 14.3 .047 1.19over .563 to .750 inclusive 14.3 to 19.1 .063 1.60over .750 to 1.000 inclusive 19.1 to 25.4 .093 2.36over 1.000 25.4 10% 10%Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 S
33、AE AMS- R-25988- 6 -TABLE II. Physical properties, type I (O-rings)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 7 -TABLE II. Physical properties, type I (O-rings) - Co
34、ntinued.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 8 -TABLE III. Physical properties, type II (molded parts (other than o-rings), sheets, strips, and extruded shapes
35、).Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 9 -TABLE III. Physical properties, type II (molded parts (other than o-rings),sheets, strips, and extruded shapes) - Con
36、tinuedCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 10 -3.6 Identification of product: 3.6.1 Sheet and strip: Unless otherwise specified (see 6.2), sheet material (incl
37、uding strip cut from sheet) shall be marked to show the specification number, the manufacturer, the manufacturers designation (compound number), class, type, grade (if applicable), and the date of manufacture (by quarter and year; for example, 1Q82), thus:MIL-R-25988B (USAF) XYZ Co.Compound No.Type
38、II, class I, grade 60Date of manufactureThe material shall be marked for identification in compliance with MIL-STD-190. The identification shall be applied in recurring pattern in lines from one end of the sheet to the other; shall be in intervals spaced 8 inches (203.2 mm) maximum apart on the line
39、; shall be in rows 5 1/2 inch (127 mm 12.7 mm) apart lengthwise of the sheet. The marking shall be applied by suitable means using a marking fluid that is not deleterious to the fluorosilicone elastomer rubber. The marking shall not be obliterated by normal handling and the color shall be of suffici
40、ent contrast to permit easy reading.3.6.2 Molded parts and extruded shapes (including tubing): Where the size of the product permits, the identification shall he marked as indicated in 3.6.1. When identification marking of the product is impractical, the unit package shall show the compound number a
41、nd manufacturer in addition to those markings specified in 5.3. Temporary marking of O-rings for the manufacturers identification shall be permitted at the time of manufacture, but shall in no way affect the properties or function of the 0-rings.3.7 Workmanship: Workmanship shall conform to the best
42、 commercial practice for fluorosilicone elastomer rubber products. Parts shall be smooth and free from flash.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for inspection: Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all insp
43、ection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves
44、 the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Inspection records shall be kept complete and available to the procuring activity at all times.Copyright SAE Int
45、ernational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS- R-25988 SAE AMS- R-25988- 11 -4.1.1 Fabricators Data: Test data obtained from base polymer and pre-compounded materials supplier is not acceptable for fulfillment of
46、 the fabricators additional responsibility for final cured product quality control.4 2 Classification of tests: The inspection and testing of the synthetic rubber shall be classified as follows:a. First article inspection (see 4.3).b. Quality conformance inspection (see 4.4).4.3 First article inspec
47、tion: 4.3.1 Samples: Test samples for type I material shall be restricted to O-rings conforming to size -214 of MIL-R-25988/1. Hardness shall be determined on specimens of sufficient dimensions to comply with ASTM D 2240. Samples for type II material shall be obtained from 6 inches by 6 inches by 0.
48、075 inch (152.4 mm by 152.4. mm by 1.905 mm) platen sheets.4.3.2 Tests: First article tests shall consist of all the tests supplied in 4.6.4.3.3 First article test report: First article tests are required for each type, class, and grade of material furnished to this specification. After the supplier
49、 completes the first article inspection he shall prepare a first article test report in accordance with MIL-STD-831. Three copies of this report shall be furnished to the procuring activity.4.3.4 Inspection conditions: Unless otherwise specified, all inspections shall be performed in accordance with the test conditions specified in applicable test method document or applicable paragrap
