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TO 1-1-700 - Robins Air Force Base

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<strong>TO</strong> 1-1-<strong>700</strong><br />

MIL-A-46106, ADHESIVE/SEALANT, SILICONE RTV,<br />

CORROSIVE 18<br />

MIL-A-46146, ADHESIVE/SEALANT, SILICONE RTV,<br />

NON-CORROSIVE, GROUP I/II/III, TYPE I OR<br />

GROUP I, TYPE II 19<br />

Room Temperature Vulcanizing (RTV) silicones<br />

conforming to MIL-A-46106 produce acetic acid<br />

(vinegar smell) which is corrosive. Therefore, as a<br />

rule of thumb, if the RTV silicone material smells<br />

like vinegar, don't use it unless required by the equipment<br />

specific manual.<br />

12.3.3 Silicone Sealing Compounds. These materials are<br />

generally one component Room Temperature Vulcanizing<br />

(RTV) materials which cure by reacting with moisture in the<br />

air. If silicones are applied too thick or in such a way that<br />

moisture is prevented from entering the material, they may not<br />

cure at all. In addition, many unauthorized silicone sealing<br />

compounds produce acetic acid, indicated by a vinegar smell,<br />

while curing which can lead to severe corrosion problems.<br />

There are two silicone sealant specifications, MIL-A-46146<br />

and MIL-A-46106. Only MIL-A-46146 materials are non-corrosive.<br />

MIL-A-46106 materials give off acetic acid while curing<br />

and shall not be used on <strong>Air</strong> <strong>Force</strong> equipment, in particular<br />

on electronic and electrical equipment unless specifically<br />

required by the equipment specific manual.<br />

Table 12-1. Sealing Compounds<br />

Specification Types Available Properties Intended Use<br />

MIL-PRF-81733, SEALING AND COATING COMPOUND,<br />

CORROSION INHIBITIVE 48<br />

MIL-PRF-81733 (supersedes<br />

MIL-S-81733), Sealing and<br />

Coating Compound, Corrosion<br />

Inhibitive<br />

Class 1 - Polysulfide<br />

Class 2 - Polythioether<br />

Grade A - Chromate Inhibitors<br />

Grade B - Non-Chromate<br />

Inhibitors<br />

Type I (thin) - for brush<br />

or dip application<br />

Type II (thick) - for<br />

sealant gun or spatula<br />

application<br />

Type III (sprayable) -<br />

for spray gun application<br />

Type IV (spreadable) -<br />

for faying surface sealing<br />

requiring extended<br />

assembly times<br />

Two-components:<br />

Room Temp Cure;<br />

Service Temp: -65 ºF to +250 º F<br />

(-54 °C to +121 °C);<br />

Peel strength: 15 lb/in width<br />

(min);<br />

Corrosion inhibiting;<br />

Resists fuel, oil, and hydraulic<br />

fluid.<br />

Sealing faying surfaces and<br />

for wet installation of fasteners<br />

on permanent structure<br />

repairs. Class 1, Grade A<br />

materials are the preferred<br />

sealants for these applications<br />

as they provide the best<br />

corrosion protection.<br />

12-2

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