SILASTIC 164

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

SILASTIC 164

Main features

  • 1:1 mix ratio
  • UL 94 V-0 flame resistance
  • Electrical insulation performance

Product Description

SYLGARD™ 164 Silicone Elastomer is a two-part, 1:1 mix ratio, gray silicone encapsulant designed for potting and protecting electrical and electronic assemblies. The material combines good flowability, moderate thermal conductivity, flame resistance, and rapid room-temperature or heat-accelerated cure to support efficient manufacturing processes. Once cured, it forms a flexible silicone elastomer suitable for protecting components in power supplies, connectors, sensors, industrial controls, transformers, amplifiers, high-voltage resistor packs, and relay assemblies. Its UL 94 V-0 flammability rating, electrical insulation properties, and broad operating temperature capability make it suitable for demanding electronic encapsulation applications.

Key features

  • 1:1 mix ratio: Supports straightforward automated mixing, dispensing, and process control.
  • UL 94 V-0 flame resistance: Can be considered for applications requiring enhanced flame-retardant performance.
  • Electrical insulation performance: Provides dielectric strength of 19 kV/mm and volume resistivity of 1.1 × 10¹³ ohm·cm.

Applications / Suitable for

  • Power supplies
  • Connectors
  • Sensors
  • Industrial controls
  • Transformers
  • Amplifiers
  • High-voltage resistor packs and relays
Product Family

SILASTIC 164

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TDS, SDS & Technical Documents

Technical Specifications

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.
19 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.
1.1 E + 13 Ohms⋅cm
Thermal Properties
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.
0.64 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 properties of the uncured two-part silicone system before processing and cure.

Property Value Unit Method / Condition
Mix Ratio 1:1 Parts Part A : Part B
Viscosity (Part A) 8,925 cP Base component
Viscosity (Part B) 9,175 cP Catalyst component
Working Time 14 minutes 25°C snap time
Cure Time 0.6 hours 25°C
Shelf Life 15 months Stored at 25°C
Technical properties

After-processing / final-state properties

Typical cured silicone elastomer properties.

Property Value Unit Method / Condition
Durometer Hardness 61 Shore A Cured elastomer
Dielectric Strength 19 kV/mm Electrical insulation property
Volume Resistivity 1.1E+13 ohm·cm Typical value
Thermal Conductivity 0.64 W/m·K Typical value
Linear CTE 225 ppm/°C By TMA
Flammability Rating UL 94 V-0 N/A UL classification

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