SYLGARD 186

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

DOWSIL 186

Main features

  • 10:1 Meter-Mix Processing
  • 255% Cured Elongation
  • 100 ppi Tear Strength

Product Description

SYLGARD 186 Silicone Elastomer combines a two-part, 10:1 mix silicone system with room-temperature and heat-cure options to form a translucent, flexible encapsulant. Its high-viscosity mixed state and 1.65-hour working time support controlled potting and encapsulation of electrical assemblies, including power supplies, sensors, transformers, relays and solar-cell components. After cure, the material combines 255% elongation, 100 ppi Die B tear strength and electrical insulation properties. It can be processed by automated metered mixing and dispensing or by manual mixing, with de-airing selected based on part geometry and process needs.

Key features

  • 10:1 mix ratio: Supports manual or automated metered mixing and dispensing.
  • Flexible cured elastomer: Typical elongation is 255% with Shore A 24 hardness.
  • High tear strength: Typical Die B tear strength is 100 ppi after cure.

Applications

General potting and encapsulation of power supplies, connectors, sensors, controls, transformers, relays and related electrical assemblies.

Product Family

SYLGARD 186

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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 (Base / Curing Agent)
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
10:1
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.
1.65 hours
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.12
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.
255 %
Electrical Properties
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.
4.98 E+15 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Typical values for the base and mixed material. Values are not specifications.

Property Value Unit Method / condition
Mix ratio 10:1 Base to curing agent
Base viscosity 123800 cP Part A or base
Mixed viscosity 66700 cP Thoroughly mixed material
Working time 1.65 hr At 25 deg C; pot life
Heat-cure time 25 min At 100 deg C
Heat-cure time 15 min At 125 deg C or 150 deg C
Shelf life 12 months Stored at 25 deg C
Technical properties

After-processing / final-state properties

Typical cured properties. Mechanical and electrical values apply to the cured elastomer under the stated test conditions.

Property Value Unit Method / condition
Specific gravity 1.12 Cured material
Tensile strength 305 (2.1) psi (MPa) Typical cured value
Elongation 255 % Typical cured value
Tear strength, Die B 100 (70) ppi (N/cm) Typical cured value
Durometer hardness 24 Shore A Typical cured value
Dielectric constant 2.70 / 2.68 At 100 Hz / 100 kHz
Volume resistivity 4.98E15 ohm cm Typical cured value

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