Formvar-EXTRA is a synthetic film insulation containing modified polyvinyl acetal and phenolic resins.
Formvar-EXTRA is based on the same enamel formulation that has been in use for over 50 years. Its 138°C Thermal Index is the highest in the market for copper products meeting MW 86 / MW 87. It also passes 220°C heat shock as well as 230°C thermoplastic flow. It is a non-solderable product and must be mechanically stripped before soldering, or terminated by means of insulation piercing terminals.