CHT Group QSil 218 Transparent, Liquid Silicone Rubber

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CHT Group QSil 218 Transparent, Liquid Silicone Rubber
Categories:	Polymer; Thermoset; Silicone; Silicone Rubber; Liquid Silicone Rubber (LSR)
Material Notes:	Product Description: QSil 218 is a two-part, clear, liquid silicone. 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. Key Features: Convenient 10:1 mixing ratio for use in automatic dispensing equipment or hand mixing Contains no solvents Non-yellowing catalyst system Formerly Amber Chemical Co (ACC Silicones), aquired by CHT in 2017
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Physical Properties	Metric	English	Comments

Specific Gravity	1.00 g/cc	1.00 g/cc	Uncatalyzed, QSil 218B
	1.02 g/cc	1.02 g/cc	Uncatalyzed, QSil 218A
Viscosity	530 cP	530 cP	Uncatalyzed, QSil 218B
	3850 cP	3850 cP	Uncatalyzed, QSil 218A
Linear Mold Shrinkage	<= 0.0010 cm/cm	<= 0.0010 in/in	Cured 60 minutes @ 100°C

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	59	59	Cured 60 minutes @ 100°C
Tensile Strength	6.67 MPa	968 psi	Cured 60 minutes @ 100°C
Elongation at Break	107 %	107 %	Cured 60 minutes @ 100°C

Electrical Properties	Metric	English	Comments
Volume Resistivity	1.70e+15 ohm-cm	1.70e+15 ohm-cm
Dielectric Constant	2.69 @Frequency 1000 Hz	2.69 @Frequency 1000 Hz
Dielectric Strength	19.7 kV/mm	500 kV/in
Dissipation Factor	0.00060 @Frequency 1000 Hz	0.00060 @Frequency 1000 Hz

Thermal Properties	Metric	English	Comments
CTE, linear	275 µm/m-°C	153 µin/in-°F
Specific Heat Capacity	0.700 J/g-°C	0.167 BTU/lb-°F
Thermal Conductivity	0.180 W/m-K	1.25 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	240 °C	464 °F
Minimum Service Temperature, Air	-55.0 °C	-67.0 °F

Optical Properties	Metric	English	Comments
Refractive Index	1.406	1.406	Cured 60 minutes @ 100°C

Processing Properties	Metric	English	Comments
Cure Time	30.0 min @Temperature 150 °C	0.500 hour @Temperature 302 °F
	60.0 min @Temperature 100 °C	1.00 hour @Temperature 212 °F
	180 min @Temperature 60.0 °C	3.00 hour @Temperature 140 °F
Gel Time	360 min	360 min

Descriptive Properties
Color	Clear		Uncatalyzed, QSil 218A
	Clear		Uncatalyzed, QSil 218B
	Clear, colorless		Catalyzed

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PACC2082 / 199470

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