1、 AMSC N/A FSC 5970 INCH POUND MIL-PRF-46846D 02May2013 SUPERSEDING MIL-PRF-46846C 29December1998 PERFORMANCE SPECIFICATION RUBBER, SYNTHETIC, HEAT - SHRINKABLE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification
2、covers the type and class requirements for extruded tubing, molded parts, and extruded shapes that are flexible, electrical insulating and whose dimensions will reduce to a predetermined size upon the application of heat. 1.2 Classification. The heat-shrinkable rubber will consist of the following t
3、ypes and classes, as specified (see 6.2). Type I. Cross-linked, modified polychloroprene (Neoprene) molded parts, and extruded shapes, flexible general purpose cable-jacketing, cable harness, boots and transitions, service temperature range of -55 to 90C. Class 1 - Deleted (see 6.4.1). Class 2 - Mol
4、ded parts and extruded shapes, cable harness boots and transitions, expansion ratio 2.5. Type II. Cross-linked, modified flame-retardant silicone rubber tubing, molded parts and extruded shapes, highly flexible, ablative-resistant. Class 1 - Tubing, expansion ratio 1.75, service temperature range of
5、 -70 to 180C. Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center Richmond (DSCR), ATTN: DLA-Aviation, 8000 Jefferson Davis Highway, Richmond, VA 23297-5610 or emailed to STDZNMGTdla.mil. Since contact information can change, you may want to verify the
6、currency of this address information using the ASSIST database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-46846D 2 Class 2 - Molded parts and extruded shapes, expansion ratio 2 to 4, service temperature range -7
7、5 to 135C. Type III. Cross-linked, fluoroelastomer, modified polymer of hexafluoropropylene and vinylidene fluoride dipolymer, molded parts and extended periods of high temperature and solvent attack. Class 1 - Tubing, expansion ratio 2, service temperature range -55 to 200C. Class 2 - Molded parts
8、and extruded shapes, expansion ratio 3.5, service temperature range of -55 to 200C. Type IV. Cross-linked, modified, propellant-resistant butyl rubber tubing, molded parts and extruded shapes, flexible for protection of cable assemblies exposed to hypergolic fuels. Class 1 - Tubing, expansion ratio
9、2, service temperature range of -55 to 125C. Class 2 - Molded parts and extruded shapes, expansion ratio 2.5, service temperature range of -55 to 125C. Type V. Deleted (see 6.4.2). Type VI. Cross-linked, modified, flame-resistant ethylene-propylene rubber tubing, molded parts, extruded shapes, flexi
10、ble, ozone resistant, and mechanically tough. Class 1 - Tubing, expansion ratio 2, service temperature of -70 to 115C. Class 2 - Molded parts and extruded shapes, expansion ratio 4, service temperature range of -75 to 125C. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section ar
11、e specified in sections 3 and 4 of this specification. This 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 t
12、hey must meet all specified requirements documents cited in sections 3 and 4 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 exte
13、nt specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-46846D 3 STANDARDS FEDERAL FED-STD-376 Preferred Metric Units for
14、General Use By The Federal Government DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-5606 Hydraulic Fluid, Petroleum Base: Aircraft; Missile, and Ordnance MIL-PRF-7254 Propellant, Nitric Acid MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base MIL-PRF-26539 Propellants, Dinitrogen Te
15、troxide MIL-PRF-27402 Propellant, Hydrazine - UNS-Dimethylhydrazine (50% N2H4 - 50% UDMH) (Copies of these documents are available online at http:/assist.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Gover
16、nment publications. The following documents 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. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D257 - Standard Test Method for D
17、C Resistance or Conductance of Insulating Materials ASTM D412 - Standard Test Method for Vulcanized Rubber and Thermoplastic Elastomers - Tension ASTM D570 - Standard Test Method for Water Absorption of Plastics ASTM D635 - Standard Test Method for Rate of Burning and/or Extent and Time of Burning o
18、f Plastics in a Horizontal Position ASTM D746 - Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact ASTM D792 - Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement ASTM D876 - Standard Test Method for Nonrigid Vinyl
19、Chloride Polymer Tubing Used for Electrical Insulation ASTM D1149 - Standard Test Method for Rubber Deterioration Surface Ozone Cracking in a Chamber ASTM D2240 - Standard Test Method for Rubber Property-Durometer Hardness ASTM D2671 - Standard Test Method for Heat-Shrinkable Tubing for Electrical U
20、se ASTM G21 - Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-46846D 4 (Copies of these documents are available from www.astm.org or ASTM International, 1
21、00 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, howe
22、ver, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.3. 3.2 Toxic chemicals, hazardous substances, and ozone d
23、epleting substances (ODS). The use of toxic chemicals, hazardous substances, or ODS shall be avoided, whenever feasible. 3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provid
24、ed that material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs. 3.4 Materials. Type I synthetic rubber specified herein shall be fabricated from a cross- linked, stabilized, modified polychloroprene (Neoprene) composition. Type
25、 II synthetic rubber shall be fabricated from a cross-linked, stabilized, flame-retardant, modified silicone rubber composition. Type III synthetic rubber shall be fabricated from a cross-linked, stabilized, flame- resistant, fluorelastomer, modified polymer of hexafluoropropylene and vinylidene flu
26、oride dipolymer. Type IV synthetic rubber shall be fabricated from a cross-linked stabilized, propellant-resistant, modified butyl rubber composition. Type VI synthetic rubber shall be fabricated from a cross-linked, stabilized, flame-resistant, modified ethylene-proplylene rubber composition. These
27、 expanded synthetic rubbers shall shrink to predetermined dimensions upon the application of heat as follows: a. Types I, IV, and VI - Heat in excess of 135C. b. Types II, III - Heat in excess of 175C. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
28、MIL-PRF-46846D 5 3.5 Dimensions and tolerances (see table I). 3.5.1 Extruded tubing. 3.5.1.1 Sizes and tolerances. Unless otherwise specified (see 6.2), types II through VI extruded tubing shall have the sizes and tolerances specified in table I, as supplied and after heating (see 4.4.2.3.3). 6.2).
29、3.5.1.2 Length. The length of tubing shall be as specified in the contract or order (see 3.5.2 Molded parts and extruded shapes. The dimensions and tolerances of heat- shrinkable molded parts and extruded shapes shall be as specified on the applicable drawings or as specified in the contract or orde
30、r (see 6.2). 3.5.3 Nonstandard dimensions. 3.5.3.1 Nonstandard thicknesses and shapes. Nonstandard thicknesses and shapes shall be specified by the procuring activity. Dimensional tolerances for these nonstandard thicknesses or shapes shall conform to the tolerances for the nearest standard size, un
31、less otherwise specified (see 6.2). 3.5.3.2 Length. If applicable, the length of tubing shall be as specified in the contract or order (see 6.2). 3.5.4 Storage. The heat-shrinkable tubing, molded parts, and extruded shapes shall meet the requirements of this specification after accelerated storage c
32、onditioning (see 4.3.1 and 4.3.2). 3.6 Physical, electrical, and chemical properties. 3.6.1 Tubing. Types II through VI, class 1, synthetic rubber tubing shall have the physical, electrical, and chemical property requirements as specified in table II (see 4.4.2.1). 3.6.2 Molded parts and extruded sh
33、apes. Types I through VI, class 2, synthetic rubber molded parts and extruded shapes, shall have the physical, electrical, and chemical property requirements (see 4.4.2.2) as specified in table III. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6 M
34、IL-PRF-46846D TABLE I. Tubing sizes and tolerances, types II through VI, class 1. EXPANDED - AS SUPPLIED RECOVERED DIMENSIONS - AFTER HEATING MINIMUM INSIDE DIAMETER, INCHES MAXIMUM INSIDE DIAMETER, INCHES WALL THICKNESS, INCH Size, Inches Type II Type III Type IV Type VI Type II Type III Type IV Ty
35、pe VI Type II Type III Type IV Type VI 0.25 0.250 0.250 0.250 0.250 0.143 0.125 0.125 0.125 .035.010 .030.010 .035.010 .030.010 0.375 0.375 0.375 0.375 0.375 0.214 0.187 0.187 0.187 .040.010 .035.010 .040.010 .035.010 0.5 0.500 0.500 0.500 0.500 0.286 0.250 0.250 0.250 .048.010 .043.010 .050.015 .04
36、3.010 0.625 0.625 0.625 - 0.625 0.357 0.312 - 0.312 .052.015 .047.012 - .047.012 0.75 0.750 0.750 0.750 0.750 0.428 0.375 0.375 0.375 .057.015 .052.015 .060.015 .052.015 0.875 0.875 0.875 - 0.875 0.500 0.437 - 0.437 .065.015 .060.015 - .060.015 1.0 1.00 1.00 1.00 1.00 0.570 0.500 0.500 0.500 .070.01
37、5 .065.015 .075.020 .065.015 1.25 1.25 1.25 - 1.25 0.714 0.625 - 0.625 .087.020 .070.020 - .070.020 1.5 1.50 1.50 1.50 1.50 0.857 0.750 0.750 0.750 .095.020 .075.020 .100.020 .075.020 1.75 1.75 - - - 1.00 - - - .107.020 - - - 2.0 2.00 2.00 2.00 - 1.14 1.00 1.00 - .110.020 .110.020 .110.020 - 2.5 - -
38、 2.50 - - - 1.25 - - - .130.020 - 3.0 - - 3.00 - - - 1.50 - - - .140.020 - 4.0 - - 4.00 - - - 2.00 - - - .150.020 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7 MIL-PRF-46846D TABLE II. Physical, electrical, and chemical properties of synthetic
39、rubber tubing, class 1. Property Conditioning (see 4.4.2.3) Requirement Method Type II Type III Type IV Type VI Type II Type III Type IV Type VI Longitudinal Change percent, maximum A A E4/-95 E4/572 E168/352 E168/392 A A E24/77 E24/77 E24/77 A A A E4/-40 E4/-572 E168/482 E168/482 A A E24/77 E24/77
40、E24/77 A A A E4/-67 E4/392 E96/902 E168/302 A A E24/77 E1/2/77 E1/2/77 A A A E4/-103 E4/392 E168/302 E96/302 A A E24/77 E24/77 E24/77 A 10 20 15 15 Paragraph 4.5.3 Tensile Strength, psi, minimum 600 1200 1200 1400 (See 4.4.2.1) Tensile Stress at 100 percent elongation, psi, maximum 500 1400 1200 100
41、0 (See 4.4.2.1) Elongation, percent, minimum 200 250 250 200 (See 4.4.2.1) Specific Gravity, maximum 1.35 2.0 1.40 1.25 (See 4.4.2.1) Hardness, Shore A 60 5 82 5 85 5 80 5 ASTM D2240 Low Temperature Pass or Fail Pass or Fail Pass or Fail Pass or Fail (See 4.4.2.1) Heat Shock - No dripping, flowing o
42、r cracking- Paragraph 4.5.4 Heat Aging, followed by tests for: Paragraph 4.5.5 Tensile Strength, psi, minimum 500 1200 1000 1200 (See 4.4.2.1) Elongation, percent, minimum 120 200 100 100 (See 4.4.2.1) Dielectric Strength, volts/mil, minimum 300 150 100 220 (See 4.4.2.1) Volume Resistivity, ohm-cm,
43、minimum 1 X 1011 1 X 109 1 X 1010 1 X 1011 (See 4.4.2.1) Flammability, seconds maximum 60: self-exting. 1/ Method A 15: self exting. Method B - 15: self exting. Method A (See 4.4.2.1) (Use indicated method) Fungus Resistance Rating of 0 - ASTM G21 Water Absorption, percent, maximum 1.0 0.5 0.5 1.0 (
44、See 4.4.2.1) (Procedure A) Solvent Resistance, followed by tests for: Paragraphs 3.7 and 4.5.6 Tensile strength, psi, minimum 400 1200 1000 500 (See 4.4.2.1) Elongation, percent, minimum 120 250 200 100 (See 4.4.2.1) Eccentricity, percent, minimum 60 60 60 60 ASTM D2671 1/ Not more than 25 percent o
45、f indicator flag burned; no dripping or flowing. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-8 MIL-PRF-46846D TABLE III. Physical, electrical, and chemical properties of synthetic rubber molded parts and extruded shapes, class 2. Property Conditi
46、oning (see 4.4.2.3) Requirement Method Type I Type II Type III Type IV Type VI Type I Type II Type III Type IV Type VI Elastic Memory, percent, minimum A A E4/-67 E4/302 E96/212 E96/212 A A E24/77 E24/77 E24/77 A A E4/-104 E4/432 E96/347 E96/347 A A E24/77 E24/77 E24/77 A A E4/-87 E4/572 E168/482 E1
47、68/482 A A E24/77 E24/77 E24/77 A A E4/-67 E4/572 E96/302 E96/302 A A E24/77 E1/77 E1/77 A A E4/-103 E4/437 E168/302 E168/302 A A E24/77 E24/77 E24/77 Expansion 150 Retraction 90 Expansion 250 Retraction 90 Expansion 200 Retraction 90 Expansion 150 Retraction 90 Expansion 275 Retraction 93 Paragraph
48、 4.5.2 Tensile Strength, psi, minimum 1500 600 1800 1200 1600 ASTM D412, Die D Tensile Stress at 100 percent elongation, psi, maximum 750 600 1200 1000 750 ASTM D412, Die D Elongation, percent, minimum 200 200 300 250 450 ASTM D412, Die D Specific Gravity, maximum 1.50 1.35 1.95 1.40 1.25 ASTM D792 Hardness, Shore A 78 5 83 5 85 5 90 5 85 5 ASTM D2240 Low Temperature P
