SAE International

(R) Sealing and Coating Compound, Polyurethane (PUR) Fuel Resistant High Tensile Strength / Elongation For Integral Fuel Tanks / Fuel Cavities / General Purpose
 N AMS3278B

Annotation

Form

This specification covers polyurethane (PUR) in the form of two-component sealing compounds.

Application

This product has been used typically for contact with fuels, but usage is not limited to such applications. Each application should be considered separately. This polyurethane (PUR) has a service temperature range of -65 to +250 °F (-54 to 121 °C) with a continuous fuel service temperature range of -65 to +160 °F (-54 to +71 °C). It may be used for faying surface sealing, wet-installation of fasteners, overcoat of fasteners, sealing joints and seams and, in some cases, as a non-structural adhesive.

NOTE: The use of the manufacturer’s recommended adhesion promoter may be required to obtain proper adhesion.

Classification

Sealing compounds covered by this specification are classified as follows:

Types

Type 1 – Non-corrosion inhibiting

Type 2 – Corrosion inhibiting

Classes

Class A - For application by brush or spray. Available in the following application times:

Class B - For application by extrusion gun or spatula. Available in the following application times:

B-1/2