VRI 707 is a Class H semi-rigid, solventless polyester varnish. It has high thermal capability, excellent electrical properties, and excellent moisture resistance. VRI 707 has been specifically designed to have bond strength while retaining a degree of flexibility for resistance to thermal shock in applications such as random and form wound stators and rotors. This varnish has been designed for dipping and vacuum-pressure impregnation applications where conformance to OSHA flash point regulations is required. - Permafil® 707 Solventless Polyester resin is a semi rigid resin system designated primarily for vacuum pressure impregnation of both form round and random wound motors. Its high thermal capability coupled with its excellent electrical properties over a wide temperature range make this resin system suitable for both AC and DC application.