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DESCRIPTION ISONEL 51 is a high-temperature, modified polyester varnish for use in conventional dip and bake applications. ISONEL 51 cures to a clear, tough film and offers an economical alternative to sillicone varnishes for U.L. Class 200 and Class 220 protection. ISONEL 51 is certified as meeting the requirement of military specification MIL-I-24092, Grade CB, Composition I, Class 180. RECOMMENDED USES ISONEL 51 is designed for thermally superior performance on stators, armatures, tranformers and form-wound coils. PHYSICAL PROPERTIES Viscosity at 77F (25 C) Zahn #2 (seconds) 70-100 Centipoises 150-250 Specific Gravity at 77F (25 C) 0.945-0.965 Solids Content, % 48-52 Flash Point (ASTM D 56-70, F/C) 86/30 Viscosity Reducer Xylol CURE CYCLE ISONEL 51 cures in two to eight hours at 300-400F (149-204 C), the actual cycle depending on oven efficiency and the weight and shape of the treated unit. CURED FILM PROPERTIES (Varnish cured 2 hrs at 400F[204 C]) Electrical - Dielectric Strength (ASTM D 115) on copper Dry - 4400 Volts/Mil Wet - 3500 Volts/Mil Mechanical - Helical Coil Bond Strength (ASTM D 2519 on Mw-35) 77F (25 C) - 21.5 Pounds (9.8kg) 302F (150 C) - 1.3 Pounds (0.6kg) U.L. 1446 THERMAL ENDURANCE (C based on 20000 hour intercept) Twisted Pair Helical Coil MW-16 220 240 MW-24# 180 220 MW-30 200 220 MW-35 200 220 Curved Electrode ASTM D 1923) 180 C -- -- ISONEL 51 is also available in a Rule 66, high-flash solvent system; ISONEL 51-66HF . ISONEL 51 is made under U.S. Patent 3523820 and corresponding international equivalents.
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