ITW Insulcast® RTVS A-4000 Silicone Potting/Encapsulation Compound

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ITW Insulcast® RTVS A-4000 Silicone Potting/Encapsulation Compound
Categories:	Polymer; Thermoset; Silicone; Silicone, RTV, Encapsulation Grade
Material Notes:	Insulcast® solutions are compounds designed for potting and encapsulating. INSULCAST RTVS A-4000 is a two component solvent based silicone resin adhesive with excellent lap shear and peel strengths at elevated temperatures. RTVS A-4000 can be used to bond silicones, Mylar, metals and many engineering plastics, and will maintain significant peel strength up to 300°F. It will retain flexibility over an elevated temperature range of -73° to 260 °C. RTVS A-4000 is approved for use within the Army Missile Command, The Department of the Army and is available for use by all agencies of the Department of Defense under MIL-A-47317(MI). The overall balance of peel strength, cohesion, lap shear strength and high temperature holding power observed in RTVS A-4000 adhesive provides a versatility that makes this product useful in a wide variety of fastening and bonding applications. Information provided by ITW Performance Polymers.
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Physical Properties	Original Value	Comments

Specific Gravity	0.950 g/cc	Uncured. Part B
	0.990 g/cc	Uncured. Part A
Solids Content	55 %	uncured
Viscosity	50 cP	Part B; ASTM D2393
	900 - 2500 cP	Mixed, Part A, Part B; ASTM D1084
	1000 - 5000 cP	Part A; ASTM D2393

Mechanical Properties	Original Value	Comments
Adhesive Bond Strength	120 psi	silicone to aluminum lap shear; ASTM D624
	130 psi	Mylar to Mylar lap shear; ASTM D624
Peel Strength	0.000250 kN/m	Cured. Mylar to Mylar @ 180°
	>= 36.0 pli

Electrical Properties	Original Value	Comments
Dielectric Strength	450 V/mil	ASTM D149

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	260 °C
Minimum Service Temperature, Air	-73.0 °C
Flash Point	40.0 °F	COC. Uncured

Processing Properties	Original Value	Comments
Cure Time	8.00 hour @Temperature 200 °C
	24.0 - 96.0 hour @Temperature 23.0 °C
Pot Life	24.0 min	Part A, Part B. Refrigerated
Shelf Life	6.00 Month	Part A, Part B

Descriptive Properties
Color	clear	part B, uncured
	light straw	part A, uncured
Mix Ratio by weight	0.0694826388888889	Part A: Part B
Solvent	Toluene

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PITWIN9127 / 239637

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