MIL-PRF-46846D
(Copies of these documents are available from www.astm.org or ASTM International, 100 Barr
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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, however, 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 depleting 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 provided
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 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 fluoride
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 expanded synthetic rubbers shall shrink to predetermined dimensions upon
the application of heat as follows:
Heat in excess of 135C.
a. Types I, IV, and VI -
Heat in excess of 175C.
b. Types II, III
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