EPUSIL RTV-295

Thermally Conductive, Deep Section Cure

Reversion Resistant, RTV Silicone Encapsulant

Description

Epusil RTV-295 is a low viscosity, RTV silicone encapsulant that displays high thermal conductivity and may be heat accelerated to final cure. Epusil RTV 295 will conform to UL 94 V-0 flame retardation, and is also reversion resistant.

PROPERTIES - Uncured

Part A                                      Part B

Color, visual...................................      Red                                          Clear

Viscosity, ASTM-D-1084 (cps.)…..    10500+/-1000                         1,000

Specific Gravity (gr/cm3 @250).......      2.4 +/- 0.05                             1.0

Mix Ratio (weight)......................….                             100:5

Mixed Viscosity, ASTM-D-1084...                              10,500 c.p.s.

Pot Life @ 25⁰C (hours)................                               40 – 45 minutes

Shelf Life @ 25⁰C .........................                              6 months min.

PROPERTIES – Cured

Physical

Hardness, ASTM-D-2240 (Durometer).                          Shore A 65 +/- 3

Tensile Strength, ASTM-D-412 .............                         35 kg/cm²+/-2

Tensile Elongation, ASTM-D-412 .........                          100%

Tear Strength, ASTM-D-624 (Die B-kg /cm.)                   8

Coefficient of Thermal Expansion (cm/cm/⁰C)                    18.0 * 10^-5

Service Temperature..............................                            -55⁰C to 204⁰C

Electrical

Dielectric Strength, ASTM-D-149 (volts/mil)....                        500

Dielectric Constant, ASTM-D-150 (60 Hz).......                       3.7

Dissipation Factor, ASTM-D-150 (60Hz).........                       0.005

Volume Resistivity, ASTM-D-257 (ohm-cm)...                        5 * 10¹⁴

Thermal Conductivity (W/m ⁰C) ………………                       1.45

MIXING INSTRUCTIONS

1.             Pre-mix Part A in original container before withdrawing any material.

2.             Measure 5 parts of Part B each 100 parts of Part A by weight.

3.             Mix thoroughly, scraping both the bottom and the sides of mixing container.

4.             To ensure void-free castings, evacuate @ 29 in. Hg. For 3-4 minutes.

5.             Pour into unit or mold.

CURE SCHEDULE

Overnight at room temperature (12-16 hours @ 25 ⁰C), or

1.             4 hours               @ 60 ⁰C

2.             1 hour                 @ 100 ⁰C

3.             15 minutes          @ 125 ⁰C

NOTES

Certain materials may inhibit the cure of Epusil RTV 295 when placed in contact with the mixed, uncured rubber. Materials such as amines and amine-cured epoxies, sulfur containing materials and condensation (tin cured) silicones, are some, which may cause inhibition. Even surfaces, which have been in contact with such materials, may cause it. If in doubt, a patch test should be done.

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