RTV Silicones >> Translucent, flowable, 2 Part Potting and Encapsulating Compound >> Extreme low temperature



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RTV Silicones by

2-Part Potting/Encapsulating Compound RTV656

Technical Support
for RTV Silicones

1-800-255-8886

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MSDS

Catalyst options/MSDS

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Specifications

Available Sizes

Related products:
	RTV21
	RTV31
	RTV60
	RTV88
	RTV560
	RTV566
	RTV577
	RTV630
	RTV656



	Selection Guide One Part Chart Two Part Chart


	General Purpose Aerospace Marine High Performance Assembly Electronics Thermal Conductivity High Temperature Low Temperature

Primary Characteristics

Translucent Flowable
Addition cure
Extreme low temperature
Useful to -115°C
(-175°F)
Mix ratio 10:1
Primer required

Use in aerospace applications for potting, bonding and and sealing, and where extended low temperature service is required. This two-part silicone is supplied with a curing agent. Silicone primer is required.

Available Sizes

Catalog Number	Sizes Available	Description	Case Qty
RTV656-1G	1 gallon	10 lbs. kit	1
RTV656 requires a primer. Visit our primer guide for details.

Specifications

Use	Potting & Encapsulating
Special Feature	Low Temperature
Cross Reference	RTV656
Uncured Properties
Consistency	Flowable
Color	White
Specific Gravity	1.02
Pot Life	4 hours
Cure Time (@ 50% RH)
25°C (77°F)	7 days
65°C (149°F)	4 hours
100°C (212°F)	1 hour
125°C (256°F)	45 minutes
150°C (302°F)	15 minutes
Useful Temp. Range	-115°C to 204°C (-175°F to 400°F)
Cured Properties - MECHANICAL
Hardness	44 (Shore A)
Cured Properties - ELECTRICAL
Volume Resistivity	3.2 x 10¹⁵ ohm · cm
Dielectric Strength	19.7 kV/mm (500 V/mil)
Dielectric Constant	2.89 @ 1000 Hz
Cured Properties - THERMAL
Thermal Conductivity	0.19 W/m · °K
Thermal Expansion	27 x 10^-5 cm/cm °C
	(15.3 x 10^-5 in/in °F)
Other
Viscosity (@ 25°C)	4,000 cps
Mix Ratio (by weight)	10:1

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