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SAE AMS 3277D Document Information:
Title
Sealing Compound, Polythioether Rubber Fast Curing for Integral Fuel Tanks and General Purpose, Intermittent Use to 400 °F (204 °C)
SAE International
Publication Date:
Jul 1, 2007
Scope:
Form
This specification covers polythioether rubber fuel resistant
sealing compounds supplied as a two-component system which cures at
room temperature.
Application
This product has been used in aircraft integral fuel tanks for
repair of fillet and fastener seals and faying surface seals as
well as initial sealing of faying surfaces, overcoating of
fasteners, and sealing of seams and joints, for service from -80 to
+320 °F (-62 to +160 °C), with short-term recurring exposures
(approximately six hours) up to 400 °F (204 °C) but usage is not
limited to such applications. This product is not recommended for
use on aircraft windshields or canopies or other applications where
crazing or degradation of plastic components may occur. Sealing
compound must be applied at temperatures above 50 °F (10 °C), but
will cure at lower temperatures.
Notice
This material is mixing ratio sensitive and will cure at
temperatures as low as 20 °F (-7 °C). Normal mix/freeze operations
used with polysulfide sealants are not adequate.
Classification
Sealing compounds covered by this specification are classified
as follows:
Type 1 - Sealing compound requiring an adhesion promoter for
proper adhesion. An adhesion promoter is supplied with Type 1
material and must be applied prior to the sealing compound.
Type 2 - Sealing compound not requiring an adhesion promoter for
proper adhesion.
Classification
Both Type 1 and Type 2 sealing compounds shall be supplied in
the following classes:
Class A - Suitable for brush application. Available with the
following application times:
A-1/4
A-1/2
A-1
A-2
Class B - Suitable for application by extrusion gun or spatula.
Available with the following application times:
B-1/4
B-1/2
B-2
B-4
B-6
B-12
Class C - Suitable for application by brush, extrusion gun,
roller or spatula. Used for faying surface sealing only. Available
with the following application time:
Notation: C-x/y where
x = Application Time in hours,
y = Assembly Time in hours.
C-4/4
Safety - Hazardous Materials
Shall be in accordance with AS5502 (1.1).
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