This article introduces the various properties of silicone rubber.
Common Name: Silicone
ASTM D-2000 Classification: FC, FE, GE
Chemical Definition: Polysiloxane
Low Temperature Usage: -60° to -150° F | -50°C to -100°C
High Temperature Usage: Up to 480° F | Up to 250°C
Tensile Range: 200-1500 P.S.I.
Elongation: 700% Maximum
Abrasion Resistance: Fair to Poor
Tear Resistance: Poor
Solvent Resistance: Poor
Oil Resistance: Fair to Poor
Caution: Generally, silicones are attacked by most concentrated solvents, oils, acids and dilute sodium hydroxide.
Aging Weather – Sunlight: Excellent
Adhesion to Metals: Good
Durometer (Hardness) Range: 30-90 Shore A
Compression Set: Good
- Liquid Silicone Rubbers (LSR) – also called heat curable liquid materials. Processed on specially designed injection molding and extrusion equipment.
- High Temperature Vulcanizing (HTV) – also called heat curable silicone, these materials usually are in a semi-solid gum form while in the uncured state. Rubber-type processing is required to produce finished items.
- Room Temperature Vulcanizing (RTV) – usually comes in the form of a flowable liquid. Commonly used for sealants, mold making, encapsulation and potting. RTV materials are generally not used as conventional rubbers.
- Silicone rubber material can be compounded in different ways to meet any number of applications.
- Silicone fillers can also improve the tensile strength to be in the area of 1500 PSA and tear resistance up to 200lbs.
- Flame retardant additives can be added to increase fire resistant properties.
- Carbon black additive will also increase the silicone’s electrical conductivity.