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Ensinger PEI

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Momentive Performance Materials Silopren LSR 7070FC Two-component liquid silicone rubber
Categories: Polymer; Thermoset; Silicone; Silicone Rubber; Liquid Silicone Rubber (LSR)

Material Notes: Silopren LSR 7070FC liquid silicone rubber is a two-component, high-transparency, medium-hardness, low-viscosity, fast-cure speed and ultra clear liquid silicone rubber (LSR). Providing good optical clarity, Silopren LSR 7070FC liquid silicone rubber combines typical LSR properties, such as high temperature stability and flowability, with excellent UV and blue light stability. As a result, molded lenses produced using this material can exhibit excellent durability and maintain optical clarity, even if exposed to high temperatures or UV light. Due to its high flowability, Silopren LSR 7070FC liquid silicone rubber can help enable excellence in manufacturing complex and microstructure optical lenses, even in large quantities, utilizing the injection and compression molding processes.

Features: 94% transmission, <1% haze, Abbe number of approximately 50, Strong color stability, High temperature resistance even above 150 °C, UV light resistance, Micro-crack resistance, Equivalent to UL 94 HB.

Applications: Interior and exterior lighting - lenses and other illumination optics, Automotive lighting - lenses and light guides, Electronics - mobile phones, flash lenses, sensing lenses, light guides and other optics, Solar - optics for concentrating PVs.

Information provided by Momentive Performance Materials.

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Physical PropertiesOriginal ValueComments
Density 1.05 g/ccJIS K 6249
Water Absorption <= 0.10 %D 570
Viscosity 25000 cPB- component. 23°C D=10/s)
 50000 cPMixed.
 50000 cPA- component. 23°C D=10/s)
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 70JIS K 6249
Hardness, Shore D 23
Tensile Strength 8.50 MPaJIS K 6249
Elongation at Break 145 %JIS K 6249
Tear Strength 7.14 kg(f)/cmJIS K 6249
 
Thermal PropertiesOriginal ValueComments
CTE, linear 270 µm/m-°C
@Temperature 40.0 - 90.0 °C
Flammability, UL94 HB
Shrinkage 2.1 %JIS K 6249
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.41Cured
Abbe Number 49
Haze <= 1.0 %Cured; D 1003
Transmission, Visible 93 %
@Thickness 2.00 mm
400 nm
 94 %
@Thickness 2.00 mm
700 nm
 
Processing PropertiesOriginal ValueComments
Processing Temperature 130 °C
@Time 900 sec
Press Cure as Tested
Pot Life 2880 min
@Temperature 20.0 °C
Closed vessel
 2880 min
@Temperature 23.0 °C
 
Descriptive Properties
AppearanceOptical ClarityA-component
 Optical ClarityB-component
Curing Data1.410' at 110°C T60 [min].
Mix Ratio1:1 by weight.

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PMOMEN9992 / 265807

Proto3000 – 3D Engineering Solutions

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