DOWSIL SH850

Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide

DOWSIL SH850

Main features

  • 1-to-1 Mix Ratio
  • Flowable
  • UL94 V-0

Product Description

DOWSIL™ SH 850 LTV is a two-part, 1-to-1 mix polydimethylsiloxane silicone encapsulant designed for electrical and PCB assembly protection. This flowable encapsulant cures to a flexible elastomer and offers UL94 V-0 flammability classification for applications requiring electrical insulation and flame-retardant performance. The material features a robust 1:1 mix ratio that simplifies processing, a six-hour working time at 25°C, and can be cured at room temperature or heat cured for faster production cycles. DOWSIL™ SH 850 LTV is suitable for power supplies, inverters, and other electronic assemblies where environmental protection, electrical insulation, and component encapsulation are important.

Key features

  • UL94 V-0 flammability rating: Supports applications requiring flame-retardant encapsulation materials for electronic assemblies.
  • 1:1 mix ratio system: Simplifies dispensing and processing while accommodating normal manufacturing variation.
  • Flexible cured elastomer: Delivers electrical insulation properties with dielectric strength of 29 kV/mm and volume resistivity of 1×10^14 ohm·cm.

Applications / Suitable for

  • Power supplies
  • Inverters
  • Electrical assemblies
  • PCB system encapsulation
  • Electronic component protection
Product Family

DOWSIL SH850

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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 (A | B)
Density (g)
1.53 g/cm3
Pot Life
Pot life is the amount of time it takes for the viscosity of a material to double (or quadruple for lower viscosity materials) in room temperature after a material is mixed. It is closely related to work life but it is not application dependent, less precise and more of a general indication of how fast a system is going to cure.
6 hours
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.
100 %
Electrical Properties
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
29 kV/mm
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
1E+14 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Representative as-supplied and processing properties for DOWSIL™ SH 850 LTV prior to cure.

Property Value Unit Method / condition
Color Red / White - Part A / Part B
Viscosity (Part A) 3900 mPa·s ASTM D1084
Viscosity (Part B) 2100 mPa·s ASTM D1084
Mixed Viscosity 3500 mPa·s After mixing
Working Time (Pot Life) 6 hours 25°C
Heat Cure Time 15 minutes 100°C
Shelf Life 12 months 25°C
Technical properties

After-processing / final-state properties

Typical cured properties of DOWSIL™ SH 850 LTV elastomer.

Property Value Unit Method / condition
Density 1.53 g/cm³ Cured, ASTM D792
Hardness 68 JIS Type A JIS K6253
Tensile Strength 3.6 MPa JIS K6301
Elongation 100 % JIS K6301
Dielectric Strength 29 kV/mm JIS K6249
Volume Resistivity 1E+14 ohm·cm JIS K6249
Dielectric Constant 3.2 - 1 MHz
UL Flammability UL94 V-0 Rating Cured material

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