1、 INCH-POUND MIL-DTL-25988C11 August 2006 SUPERSEDINGMIL-R-25988B12 July 1983 DETAIL SPECIFICATION RUBBER, FLUOROSILICONE ELASTOMER, OIL AND FUELRESISTANT, SHEETS, STRIPS, MOLDED PARTS, AND EXTRUDED SHAPES Reactivated after 11 August 2006 and may be used for new and existing designs and acquisitions.
2、 This specification is approved for use by all Departments and Agencies of the Department of Defense. 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. 1.
3、2 Classification The fluorosilicone elastomer rubber should be of the following types, classes, and grades, as specified (see 6.2). Comments, suggestions, or questions on this document should be addressed to ASC/ENOI, 2530 Loop Road West, Wright-Patterson AFB OH 45433-7101 or emailed to Engineering.
4、Standardswpafb.af.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 5330 DISTRIBUTION STATEMENT A. Approved for public release, distribution is unlimited. Provided by
5、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25988C Type I O-rings (available only in class 1, grades 60, 70, and 80 and class III, grade 75) and other compression seals. Type II Molded parts (other than compression seals) sheets, strips, and extruded
6、 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. Grade 70 Nominal 70 type A durometer hardness, type I and II. Grade 80 Nominal 8
7、0 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 2.1 General The documents listed in this section are specified in sections 3, 4, or 5 of this specification
8、. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of d
9、ocuments cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents 2.2.1 Specifications, standards, and handbooks The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise sp
10、ecified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-25988/1 Rubber, Fluorosilicone Elastomer, Oil- and Fuel-Resistant, O-rings, Class 1, Grade 70 MIL-DTL-25988/2 Rubber, Fluorosilicone Elastomer, Oil- and Fuel-Resistant
11、, O-rings, Class 3 MIL-DTL-25988/3 Rubber, Fluorosilicone Elastomer, Oil- and Fuel-Resistant, O-rings, Class 1, Grade 60 MIL-DTL-25988/4 Rubber, Fluorosilicone Elastomer, Oil- and Fuel-Resistant, O-rings, Class 1, Grade 80 2 Provided by IHSNot for ResaleNo reproduction or networking permitted withou
12、t license from IHS-,-,-MIL-DTL-25988C DEPARTMENT OF DEFENSE STANDARDS MIL-STD-190 Identification Marking of Rubber Products MIL-STD-289 Visual Inspection Guide for Rubber Sheet Material MIL-STD-298 Visual Inspection Guide for Rubber Extruded Goods MIL-STD-407 Visual Inspection Guide for Rubber Molde
13、d Items MIL-STD-413 Visual Inspection Guide for Rubber Elastomeric O-rings (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government
14、documents, drawings, and publications The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL AVIATION ADMINIST
15、RATION FAA AC 00-56A Voluntary Industry Distributor Accreditation Program (Copies of this document are accessible online at http:/www.faa.gov/.) 2.3 Non-Government publications The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues
16、 of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D 297 Rubber ProductsChemical Analysis ASTM D 395 Rubber PropertyCompression Set ASTM D 412 Vulcanized Rubber and Thermoplastic ElastomersTension ASTM D 471 Rubber PropertyEffe
17、ct of Liquids ASTM D 573 RubberDeterioration in an Air Oven ASTM D 624 Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers ASTM D 1329 Evaluating Rubber PropertyRetraction at Lower Temperatures (TR Test) ASTM D 1414 Rubber O-Rings ASTM D 2240 Rubber PropertyDurometer Hardnes
18、s 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25988C (Application for copies should be addressed to ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, or online at http:/www.astm.org/.) INTERNATIONAL ORGANIZATI
19、ON FOR STANDARDIZATION (ISO) ISO 17025 General requirements for the competence of testing and calibration laboratories (Application for copies should be addressed to the International Organization for Standardization (ISO), 1, rue de Varemb, Case postale 56, CH-1211 Geneva 20, Switzerland, or online
20、 at http:/www.iso.org/.) SAE INTERNATIONAL AMS 2629 Fluid, Jet Reference AMS 3021 Reference Fluid for Testing Di-Ester (Polyol) Resistant Material AS 9100 Quality Management Systems - Aerospace - Requirements-Technically Equivalent to AECMA prEN 9100 AS 9120 Quality Management Systems - Aerospace Re
21、quirements for Stockist Distributors (Application for copies should be addressed to SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001, or online at http:/www.sae.org/.) 2.4 Order of precedence In the event of a conflict between the text of this document and the references cit
22、ed herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Specification sheets The individual item requirements shall be as specified herein and in accordance
23、 with the applicable specification sheet. 3.2 First article When specified, a sample shall be subjected to first article inspection (see 4.2 and 6.2). 3.2.1 Test report A test report shall be prepared for each type, class, and grade. An updated test report shall be prepared whenever a change is made
24、 in the materials, processes, or this specification. First article tests over three years old shall not be acceptable. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25988C 3.3 Materials The cured compound of fluorosilicone elastomer rubbe
25、r shall be entirely 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
26、 widths and 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. TABLE I. Thickness tolerances of sheet and stri
27、p. Nominal thickness (inch) Mm Tolerances (inch) Mm 0.031 and less 0.787 0.010 0.254 Over 0.031 to 0.063 inclusive 0.787 to 1.60 0.012 0.305 Over 0.063 to 0.125 inclusive 1.60 to 3.18 0.016 0.406 Over 0.125 to 0.188 inclusive 3.18 to 4.78 0.020 0.508 Over 0.188 to 0.375 inclusive 4.78 to 9.53 0.031
28、0.787 Over 0.375 to 0.563 inclusive 9.53 to 14.3 0.047 1.19 Over 0.563 to 0.750 inclusive 14.3 to 19.1 0.063 1.60 Over 0.750 to 1.000 inclusive 19.1 to 25.4 0.093 2.36 Over 1.000 25.4 10% 10% 3.4.1.1 Sheets The width of sheet material shall be 36 1 inch (91.4 2.54 cm) and the length shall be 120 inc
29、hes (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 0.305 m). 3.4.2 Molded parts (excluding O-rings) and extruded shapes (including tubing) Unless otherwise specified (see 6.2), dimensions and tolerances of mo
30、lded parts (excluding O-rings) and extruded shapes (including tubing) shall be as specified on the drawing. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25988C 6 3.4.3 O-rings Dimensions and tolerances of O-rings shall be in accordance w
31、ith the applicable military specification sheet. Those are as follows: a. Class 1, Grade 60 MIL-DTL-25988/3 b. Class 1, Grade 70 MIL-DTL-25988/1 c. Class 1, Grade 80 MIL-DTL-25988/4 d. Class 3 MIL-DTL-25988/2 3.4.4 Color Unless otherwise specified, material procured to this specification shall be bl
32、ue. A pigment that can be used is Ferro Blue No. 3247, supplied by Ferro Corporation, 4150 East 56thSt., Cleveland, Ohio 44101 or 1395 Aspen Way, Vista, California 92083. A formula of 1.5 parts of this pigment per 100.0 parts of fluorosilicone is suggested. 3.5 Physical properties The physical prope
33、rties of the fluorosilicone elastomer rubber shall conform to the values given in TABLE II and TABLE III. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25988C TABLE II. Physical properties, type I (O-rings). Class 1grade 60 Class 1 grade 70
34、 Class 1 grade 80 Class 3 grade 75 Original Properties Specific gravity As determined 1/ As determined 1/ As determined 1/ As determined 1/Hardness, points 60 5 70 5 80 5 75 5 Tensile strength, psi, min. 700 (4.83 kPa) 750 (5.17 kPa) 750 (5.17 kPa) 700 (4.83 kPa) Elongation, %, min. 150 125 70 90Tem
35、perature retraction, F, max. 70 (56.7 C) 70 (56.7 C) 70 (56.7 C) 70 (56.7 C) After air aging 70 hours 75 5 F (23.9 2.8 C) Compression set, %, max. Under 0.110 inch (2.79 mm) 20 15 25 25 Over 0.110 inch (2.79 mm) 15 15 20 20 After aging 70 hours the temperatures indicated: 392 5 F (200 2.8 C) 392 5 F
36、 (200 2.8 C) 392 5 F (200 2.8 C) 437 5 F (250 2.8 C) Hardness change, point, max. +10, 5 +10, 5 +10, 5 +10, 5 Tensile strength decrease, %, max. 25 25 20 35 Elongation decrease, %, max. 25 25 20 45 Weight loss, %, max. 2 2 2 2 After air aging 22 hours 347 5 F (175 2.8 C) Compression set, %, max. Und
37、er 0.110 inch (2.79 mm) 45 30 50 45 Over 0.110 inch (2.79 mm) 40 30 45 35 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25988C TABLE II. Physical properties, type I (O-rings) Continued. Class 1grade 60 Class 1 grade 70 Class 1 grade 80 Cl
38、ass 3 grade 75 After aging 70 hours in AMS 3021 the temperatures indicated: 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 347 5 F (175 2.8 C) Hardness change, points, max. 15 15 15 20 Tensile strength decrease, %, max. 45 40 30 30 Elongation decrease, %, max. 30 25 15 20 Volume change,
39、 % 1 to 15 1 to 15 1 to 15 1 to 15 Compression set, %, max. Under 0.110 inch (2.79 mm) 50 30 65 85 Over 0.110 inch (2.79 mm) 45 30 60 80 After aging 22 hours 75 5 F (23.9 2.8 C) in AMS 2629, Type 1 Hardness change, points, max. 20 20 20 15 Tensile strength decrease, %, max. 50 45 30 35 Elongation de
40、crease, %, max. 40 35 30 30 Volume change, % 1 to 25 1 to 25 1 to 25 1 to 25 1/ The permissible variation in specific gravity during actual production from that in first article tests shall be 0.03. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M
41、IL-DTL-25988C TABLE III. Physical properties, type II (molded parts (other than o-rings), sheets, strips, and extruded shapes). Class 1 Class 2 Class 3 Grade 40 Grade 50 Grade 60 Grade 70 Grade 80 Grade 50 Grade 75 Specific gravity As determined 1/ As determined 1/ As determined 1/ As determined 1/
42、As determined 1/ As determined 1/ As determined 1/ Hardness, points 40 5 50 5 60 5 70 5 80 5 50 5 75 5 Tensile strength, psi, min. 800 (5.52 kPa) 900 (6.20 kPa) 900 (6.20 kPa) 950 (6.55 kPa) 750 (5.17 kPa) 1150 (7.93 kPa) 800 (5.52 kPa) Elongation, %, min. 225 200 175 150 70 350 100Tensile stress 10
43、0% elongation, psi, min. 700Tear strength, psi, min. 40 (276 Pa) 40 (276 Pa) 40 (276 Pa) 75 (517 Pa) 40 (276 Pa) 150 (1034 Pa) 40 (276 Pa) Temperature retraction, F, max. 70 (56.6 C) 70 (56.6 C) 70 (56.6 C) 70 (56.6 C) 70 (56.6 C) 70 (56.6 C) 70 (56.6 C) After air aging 70 hrs. the 75 5 F (23.9 2.8
44、C) Compression set, %, max. 15 15 15 15 15 15 15After air aging 70 hrs. the temperatures indicated: 392 5 F (200 2.8 C) 392 5 F (200 2.8 C) 392 5 F (200 2.8 C) 392 5 F (200 2.8 C) 392 5 F (200 2.8 C) 392 5 F (200 2.8 C) 437 5 F (250 2.8 C) Hardness change, points, max. 10, 5 10, 5 10, 5 10, 5 10, 5
45、10, 5 10, 5 Tensile strength decrease, %, max. 30 25 25 20 20 30 35Elongation decrease, %, max. 25 25 25 25 20 30 45Weight loss, %, max. 2 2 2 2 2 2 2After air aging 22 hrs. 347 5 F (175 2.8 C) Compression set, %, max. 25 35 40 25 45 40 359 Provided by IHSNot for ResaleNo reproduction or networking
46、permitted without license from IHS-,-,-MIL-DTL-25988C 10 TABLE III. Physical properties, type II (molded parts (other than o-rings), sheets, strips, and extruded shapes) Continued. Class 1 Class 2 Class 3 Grade 40 Grade 50 Grade 60 Grade 70 Grade 80 Grade 50 Grade 75 After aging 70 hrs. in AMS 3021
47、the temperatures indicated: 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 302 5 F (150 2.8 C) 347 5 F (175 2.8 C) Hardness change, points, max. 15 15 15 15 15 15 20Tensile strength decrease, %, max. 45 45 45 40 30 40 30Elongation decrease, %, max. 30 30 30 25 15 30 20Volume change, % 1 to 15 1 to 15 1 to 15 1 to 15 1 to 15 1 to 15 1 to 15 Compression set, %, max. 35 35 45 30 60 45 80After aging 22 hrs. 75 5 F (23.9 2.8 C) in AMS 2629, Type 1 Hardness change, points, max. 15 15 20 20
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