Henkel Loctite® Stycast® 4640 Two-Component Silicone Rubber Syntactic Foam

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Henkel Loctite® Stycast® 4640 Two-Component Silicone Rubber Syntactic Foam
Categories:	Polymer; Thermoset; Silicone; Silicone, RTV, Encapsulation Grade
Material Notes:	Loctite Stycast 4640 provides the following product characteristics: Two component Lightweight Thermally conductive High temperature resistance Readily pourable Room temperature cure capability Cure: Room temperature cure or Heat cure Application: Potting or Encapsulant Loctite Stycast 4640 RTV condensation cure silicone rubber syntactic foam is engineered to yield a flexible, low density material with a low dielectric constant and dissipation factor. It is designed for airborne potting, sealing and caulking applications requiring low weight and excellent dielectric properties. Loctite Stycast 4640 can be used with Loctite CAT 50 AMB. Information provided by Henkel.
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Physical Properties	Original Value	Comments

Density	0.750 g/cc	Mixed
	0.750 g/cc	Part A, Loctite Stycast 4640
Water Absorption	<= 0.10 % @Time 86400 sec	Boil
Brookfield Viscosity	85 cP	Part B, Loctite CAT 50 AMB
	45000 cP	Mixed
	45000 cP	Part A, Loctite Stycast 4640

Mechanical Properties	Original Value	Comments
Hardness, Shore A	70
Tensile Strength	1.40 MPa
Elongation at Break	135 %

Electrical Properties	Original Value	Comments
Volume Resistivity	>= 1.00e+14 ohm-cm
Dielectric Constant	2.0 @Frequency 1e+6 Hz
Dielectric Strength	250 V/mil
Dissipation Factor	0.0040 @Frequency 1e+6 Hz

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	260 °C
Minimum Service Temperature, Air	-65.0 °C

Processing Properties	Original Value	Comments
Cure Time	2.00 - 4.00 hour @Temperature 65.0 °C	Option 2. Post cure recommended for high temperature use.
	16.0 - 24.0 hour @Temperature 25.0 °C	Option 1, Post cure recommended for high temperature use.
Working Life	60.0 min @Temperature 25.0 °C	100 g
Shelf Life	3.00 Month @Temperature 4.00 °C	Part A, Loctite Stycast 4640

Descriptive Properties
Appearance	Clear Liquid	Part B, Loctite CAT 50 AMB
	White Liquid	Part A, Loctite Stycast 4640
Mix Ratio, by Weight	100 : 0.1 to 0.4	Material : Catalyst

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PHENK7939 / 255424

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