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Silicones and Electronics
Long-term, reliable protection of sensitive circuits and components is becoming more important in many of today’s delicate and demanding electronic applications. Silicones function as durable dielectric insulation, as barriers against environmental contaminants and as stress-relieving shock and vibration absorbers over a wide temperature and humidity range. In addition to sustaining their physical and electrical properties over a broad range of operating conditions, silicones are resistant to ozone and ultraviolet degradation, have good chemical stability and are available in a variety of useful forms as conformal coatings, encapsulants and adhesives. Dow Corning’s broad range of general purpose and specialty products offers you a choice of materials for your application needs.

Dow Corning® silicone encapsulants are supplied as two-part liquid component kits comprised of:
Mix Ratio Components (by weight or volume) (as supplied)
1:1 Part A/Part B
10:1 Base/Curing agent
When liquid components are thoroughly mixed, the mixture cures to a flexible elastomer, which is suited for the protection of electrical/electronic applications.

Dow Corning silicone encapsulants cure without exotherm at a constant rate regardless of sectional thickness or degree of confinement.

Dow Corning silicone elastomers require no post cure and can be placed in service immediately following the completion of the cure schedule with an operating temperature range of -45 to 200 °C (-49 to 392 °F). Select materials have been classified by Underwriters Laboratories and/or meet military specifications.

Standard silicone encapsulants require a surface treatment with a primer in addition to good cleaning for adhesion while primerless silicone encapsulants require only good cleaning.
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Item #

Type

Mix Ratio

Color

Viscosity

Durometer

Specific Gravity

Sylgard® 160 Silicone Elastomer N/A Silicone Encapsulants N/A 1:1 N/A Gray N/A 6400 mPa/s N/A 56 N/A 1.57
Sylgard® 164 Silicone Elastomer N/A Silicone Encapsulants N/A 1:1 N/A Gray N/A 8925 mPa/s N/A 61 N/A 1.57
Sylgard® 170 Silicone Elastomer N/A Silicone Encapsulants N/A 1:1 N/A Dark gray to black N/A 3400 mPa/s N/A 40 N/A 1.38
Sylgard® 170 Fast Cure Silicone Elastomer N/A Silicone Encapsulants N/A 1:1 N/A Dark gray to black N/A 2850 mPa/s N/A 45 N/A 1.38
Sylgard® 182 Silicone Elastomer N/A Silicone Encapsulants N/A 10:1 N/A Transparent N/A 4575 mPa/s N/A 51 N/A 1.03
Sylgard® 184 Silicone Elastomer N/A Silicone Encapsulants N/A 10:1 N/A Clear N/A 4575 mPa/s N/A 48 N/A 1.03
Sylgard® 186 Silicone Elastomer N/A Silicone Encapsulants N/A 10:1 N/A Translucent N/A 66700 mPa/s N/A 24 N/A 1.12
Sylgard® Q3-3600 A&B Thermally Conductive Encapsulant N/A Silicone Encapsulants N/A 1:1 N/A Gray N/A 4700 mPa/s N/A 73 N/A 2.13
567 Primerless Silicone Encapsulant N/A Primerless Silicone Encapsulants N/A 1:1 N/A Black N/A 1540 mPa/s N/A 59 (Shore 00) N/A 1.23
3-4207 Dielectric Tough Gel Kit N/A Primerless Silicone Encapsulants N/A 1:1 N/A Green Translucent N/A 425 mPa/s N/A 30 N/A 0.97
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