RTVS 3-95-2

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

RTVS 3-95-2

Main features

  • 1:1 weight or volume mix
  • 1.44 W/(m K) thermal conductivity
  • -55 to 260 deg C service range

Product Description

INSULCAST RTVS 3-95-2 Thermally Conductive Silicone Potting Compound is a two-part, 1:1 red-and-white RTV silicone system for thermally conductive electrical potting and encapsulation. Parts A and B each have a typical viscosity of 35,000 cP at 25 deg C, and the mixed material provides a 1.5-hour pot life at the same temperature. Room-temperature and accelerated heat-cure schedules support different production windows. After cure, the silicone combines 1.44 W/(m K) thermal conductivity with electrical insulation, 85 Shore A hardness, and a service range from -55 to 260 deg C. Applications include protected electronic assemblies requiring heat transfer and dielectric performance.

Key features

  • Simple 1:1 mixing: Parts A and B use the same ratio by weight or volume
  • Flexible cure scheduling: Room-temperature and accelerated heat-cure options are available
  • Thermal and electrical function: Cured material combines 1.44 W/(m K) conductivity with dielectric properties

Applications

Potting and encapsulation of electronic assemblies requiring thermal conductivity, electrical insulation, and high-temperature service.

Product Family

RTVS 3-95-2

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two Part
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
17 %
Thermal Properties
Service temperature
-55 to 260 °C
Thermal Conductivity
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance. Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
1.44 W/m.K
UL 94 Rating
Flammability rating classification. It determines how fast a material burns or extinguishes once it is ignited. HB: slow burning on a horizontal specimen; burning rate less than 76 mm/min for thickness less than 3 mm or burning stops before 100 mm V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed. V-1: burning stops within 30 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed. V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed. 5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole. 5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole
V0

Additional Information

Technical properties

As-supplied / before-processing properties

Typical uncured values; maintain the stated component identity and 1:1 ratio.

Property Value Unit Method / condition
Part A color Red As supplied
Part B color White As supplied
Component viscosity 35,000 cP ASTM D2393 at 25 deg C; Parts A and B
Specific gravity 2.36 / 2.27 Part A / Part B at 25 deg C
Mix ratio 1:1 By weight or volume
Mixed viscosity 35,000 cP At 25 deg C
Pot life 1.5 hours At 25 deg C
Gel time 2-4 hours At 25 deg C
Technical properties

After-processing / final-state properties

Typical cured properties; final performance depends on the selected cure schedule and test condition.

Property Value Unit Method / condition
Thermal conductivity 1.44 W/(m K) ASTM D5470
Hardness 85 Shore A Cured material
Tensile strength 400 psi ASTM D412; 2.9 MPa
Elongation 17 % ASTM D412
Dielectric strength 425 V/mil Cured material
Volume resistivity 1 x 10^14 / 1 x 10^13 ohm-cm At 25 deg C / 125 deg C
Service temperature range -55 to 260 deg C Documented range

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