ISONEL 31-398 is a general-purpose, modified polyester varnish for conventional dipand bake application. Specially formulated for use in abbreviated baking cycles, it
cures quickly to a clear, tough, semirigidfilm. ISONEL 31-398 provides excellent
performance and economy in Class A (105 C) through Class H (180 C) design applications.ISONEL 31-398 is certified as meeting all requirements of military specification
MIL-I-24092 for Grade CB, Composition I, Class 155.RECOMMENDED USES
ISONEL 31-398 is designed for general-purpose application on transformers, statorsand armatures.
Viscosity at 77F(25 C)
Zahn #2 (seconds)95-135
Specific Gravity at 77F(25 C) 0.920-0.935
SolidsContent, % 46-50
Flash Point (ASTM D 56-70, F/C) 85-29
Viscosity Reducer Xylol
ISONEL 31-298 cures in one to two hours at 275-325F(135-163C), the actual cycle
depending on oven efficiency and the weightand shape of the treated unit.
CURED FILM PROPERTIES
Electrical - Dielectric Strength...