MIL-S-83318 Sealing Compound, Low Temperature Curing, Quick Repair Integral Fuel Tanks And Fuel Cell Cavities S/S By Sae-Ams-S-83318This specification covers a two component, temperature??resistant ??65??F to +250??F ??54??C to +120??C, low temperature 20??F minimum curing synthetic rubber compounds for quick repair of aircraft integral fuel tanks and fuel cell cavities. During application, the sealing compounds shall be a suitable, fluid consistency.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31

MIL-S-83318A(USAF)

2.3 Order of precedence.  In the event of a conflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or MS standards),  the text of this specification shall take precedence.  Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained.

3.  REQUIREMENTS

3.1  Qualification.  The sealing compounds furnished under this specification shall be products which are authorized by the qualifying activity for testing on the applicable qualified products list at the time of the award of contract (see 4.3 and 6.3).

3.2  Materials.  The basic ingredient used in the manufacture of the sealing compound shall be synthetic rubber of the polysulfide type.  The sealing compound shall cure   by the addition of a  curing agent to the base compound, shall not depend on solvent evaporation for curing.  The compound shall contain no lead compounds. The  curing agent shall possess sufficient color contrast to the base compounds to permit easy identification of an unmixed or incompletely mixed sealing compound.  Neither the base compound nor the cured sealing compound shall be red or pink in color.

3.2.1  Appearance.  The base compound and the curing compound (accelerator) shall each be of uniform blend and shall be free of excessive air, skins, lumps, and gelled or coarse particles.  There shall be no separation of ingredients which cannot be readily dispersed.

3.3  Physical properties.  NOTE:  THIS PARAGRAPH DOES NOT APPLY TO PURCHASES MADE BY THE U.S. GOVERNMENT.  The physical properties are divided into two categories:  performance  requirements and application requirements.  Performance requirements define those properties of the cured sealant and how the material will perform in service.  Application requirements define those properties of the uncured sealant and affect the application parameters of the sealant, but have little or no effect on the performance properties of the cured sealant.    Reference paragraphs for the two categories are  as follows:

a. Performance requirements:

3.3.1              Specific gravity

3.3.2              Non-volatile content

3.3.9              Peel strength

3.3.10            Chalking

3.3.11            Air content (Class B only)

3.3.12            Weight loss and flexibility

3.3.13            Fluid rupture resistance

4