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Plastics & Elastomers
The material selection platform
Plastics & Elastomers
by SpecialChem
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Silopren™ LSR 4660

Silopren™ LSR 4660 by Momentive Performance Materials is a two-component liquid silicone rubber, sterilizable with ethylene oxide, steam and gamma radiation. Offers high reactivity, low viscosity, fast cure, excellent biocompatibility, high temperature stability and excellent recovery after puncture. Shows high tear strength, neutral odor and taste. Exhibits excellent rubber like properties, long service life at dynamic stress, high stability to ozone and UV light. Designed for processing by injection molding. Silopren™ LSR 4660 is used in healthcare devices like sealing elements, O-rings, diaphragms, ear plugs, bellows, baby teats, respiratory devices, air vent flaps, tube connectors, catheters and mats. Complies with USP Class VI and FDA 21 CFR 177.2600 regulations.
Product Type
Silicone Rubber
Physical Form

Silopren™ LSR 4660 Properties

Physical Properties

Value & Unit
Test Condition
Test Method
500 Pa.s
(gamma = 10 s-1 at 20°C)
DIN 53018
Specific Gravity
1.13 g/cm3
(Vulcanization: 10 min at 175°C, Post cure: 4 hrs at 200°C)
DIN 53 479 A
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