TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
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