CHT Group QSil 220 Transparent, Liquid Silicone Rubber

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CHT Group QSil 220 Transparent, Liquid Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber; Liquid Silicone Rubber (LSR)
Material Notes:	Product Description: QSil 220 is a two-part, clear, liquid silicone which cures at elevated temperatures. It has a low viscosity which allows for ease of flow around complex parts, providing electrical insulation and shock resistance. The chemical composition provides hydrolytic and reversion resistance. This material also has excellent, primerless adhesion to most substrates. Key Features: Convenient 10:1 mixing ratio for use in automatic dispensing equipment or hand mixing Contains no solvents Non-yellowing catalyst system Heat cure required to obtain full properties and adhesion Formerly Amber Chemical Co (ACC Silicones), aquired by CHT in 2017
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Physical Properties	Original Value	Comments

Specific Gravity	1.01 g/cc	Uncatalyzed, QSil 220B
	1.02 g/cc	Uncatalyzed, QSil 220A
Viscosity	600 cP	Uncatalyzed, QSil 220B
	4500 cP	Uncatalyzed, QSil 220A
Linear Mold Shrinkage	<= 0.0010 cm/cm	Cured 60 minutes @ 100°C

Mechanical Properties	Original Value	Comments
Hardness, Shore A	29	Cured 60 minutes @ 100°C
Tensile Strength	450 psi	Cured 60 minutes @ 100°C
Elongation at Break	200 %	Cured 60 minutes @ 100°C
Tensile Modulus	100 psi	Young's, Cured 60 minutes @ 100°C

Thermal Properties	Original Value	Comments
CTE, linear	275 µm/m-°C
Maximum Service Temperature, Air	204 °C
Minimum Service Temperature, Air	-55.0 °C
Flammability, UL94	HB @Thickness 1.80 mm

Optical Properties	Original Value	Comments
Refractive Index	1.406	Cured 60 minutes @ 100°C

Processing Properties	Original Value	Comments
Cure Time	30.0 min @Temperature 150 °C
	60.0 min @Temperature 100 °C
	180 min @Temperature 60.0 °C
Gel Time	>= 1440 min	Catalyzed

Descriptive Properties
Color	Clear	Uncatalyzed, QSil 220A
	Clear	Uncatalyzed, QSil 220B
	Clear, colorless	Catalyzed

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PACC2084 / 199472

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