Common Names: Silicone / VMQ / PVMQ
Chemical Name: Polysiloxane
ASTM D1418 Designation: VMQ, MQ, PMQ, PVMQ
ISO/DIN 1629 Designation: VMQ
ASTM D2000/SAE J200 Type, Class: FC, FE, GE
Description: A group of elastomers, made from silicon, oxygen, and hydrogen, Silicones are renowned for their retention of flexibility and low compression set characteristics, within one of the widest working temperature ranges for elastomers.
Key Use(s): Static seals in extreme temperature situations. Seals for medical devices.
Static seals in extreme temperature situations. Seals for medical devices, compatible with FDA regulations.
Standard Compound: -85°F to +400°F
Hardness (Shore A): 20 to 80
Features: Phenyl (PVMQ) based silicones can perform to -148°F. New polymers can take short term to 600°F.
Limitations: Generally, low abrasion and tear resistance, and high friction characteristics preclude silicones from effectively sealing some dynamic applications. Silicones are also highly permeable to gases and are generally not recommended for exposure to ketones (MEK,acetone) or concentrated acids.