Silicone rubber (MQ, VMQ, PVMQ)
Physically, silicones are based on silicon, an element extracted from quartz. In order to create this combination
To form an elastomer, organic side groups such as methyl, phenyl and vinyl groups need to be attached to silicon atoms. The difference in side chains
Additions can achieve significant changes in performance. Silicone has excellent heat resistance, ozone resistance and corona resistance,
Good dielectric stability and resistance to a wide range of oils, chemicals and solvents. And among all elastomers,
Silicone has the best low temperature flexibility. But it also has some disadvantages, such as low tensile strength, tear resistance and
Poor wearability.
Curing Systems – Peroxide Cured vs. Platinum Cured
Standard silicone compounds are usually peroxide cured. Platinum cure compounds offer greater flexibility and
Very low volatile matter. Platinum-cured silicones are commonly used in medical systems or other applications requiring low evaporation
field of chemicals, but they need to be produced in clean rooms, and the cost of platinum catalysts is higher, so they
More expensive than peroxide cured.
Other common variations
• Silicones may only be dispensed using "white list" ingredients specified in 21.CFR 177.2600
Made for use where the elastomer will come into contact with food or beverages
application. • Silicones may be submitted to the National Sanitation Foundation (NSF) for approval for use in drinking water
application.
• Silicones are commonly used in automotive systems such as dust boots, oil filter valves, light gaskets, etc.
• Silicone parts can be used in medical systems that specifically require compliance with USP CLASS VI.
General information
ASTM D 1418 Name: Q, MQ, VMQ, PVMQ
ISO/DIN 1629 names: Q, MQ, VMQ, PVMQ
Standard color: rust
Hardness range: 25 to 90 Shore A
ASTM D2000 / SAE J 200 code: FC,
FE, GE relative cost: medium to high