Vicat softening point or Vicat hardness is the determination of the softening point for materials that have no definite melting point, such as plastics.

Standards to determine Vicat softening point include ASTM D 1525 and ISO 306, which are largely equivalent.

You can then follow the links to the most complete data sheets on the Web, with information such as dielectric constant, Poisson's ratio, glass transition temperature, dissipation factor, and Vicat softening point.