COOLTHERM SC-420

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

COOLTHERM SC-420

Main features

  • 3.2 W/(m K) Thermal Conductivity
  • 100% Cured Elongation
  • 2:1 Weight or Volume Mixing

Product Description

CoolTherm SC-420 Thermally Conductive Silicone Encapsulant is a two-part, flexible silicone encapsulant for electrical and electronic assemblies requiring thermally conductive protection. Resin and hardener mix 2:1 by weight or volume, and the mixed material has a typical viscosity of 50,000 cP at 25 deg C with more than 30 minutes of working time. The material can be dispensed from handheld cartridges or automatic meter/mix/dispense equipment and cures for 60 minutes at 125 deg C after reaching the target temperature. Typical cured properties include thermal conductivity of 3.2 W/(m K), 20 Shore A hardness, and 100% elongation at break.

Key features

  • Cured thermal conductivity: Typical cured thermal conductivity is 3.2 W/(m K) by the Hot Disc Transient Method.
  • Cured elongation and hardness: Typical cured elongation at break is 100%, with 20 Shore A hardness.
  • Two-to-one mixing: Resin and hardener mix 2:1 by weight or volume before dispensing.

Applications

Electrical and electronic encapsulation requiring thermal conductivity and flexibility.

Product Family

COOLTHERM SC-420

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Resin (A): Black Paste | Hardener (B): White Paste | Mixed: Gray Paste
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.
A/B/Mixed: 3.18
Physical Properties
Viscosity (Part A)
63,000 mPa.s
Viscosity (Part B)
27,000 mPa.s
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.
3.2 W/m.K
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
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 x 10^14 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Resin and hardener are supplied separately; mixed values apply after the 2:1 combination.

PropertyValueUnitMethod / condition
Mix ratio, resin:hardener2:1by weight or volumeBefore application
Viscosity, resin63,000cPTypical; 25 deg C
Viscosity, hardener27,000cPTypical; 25 deg C
Viscosity, mixed50,000cPTypical; 25 deg C
Specific gravity, mixed3.18Typical; mixed material
Working life>30minTypical; mixed material; 25 deg C
Technical properties

Cured encapsulant properties

Typical cured values use a cure schedule of 60 minutes at 125 deg C.

PropertyValueUnitMethod / condition
Thermal conductivity3.2W/(m K)Typical; Hot Disc Transient Method
Volume resistivity1 x 10^14ohm-cmTypical; ASTM D257; 25 deg C
CTE100ppm/deg CTypical; ASTM C864
Hardness20Shore ATypical; ASTM D2240
Tensile strength145psiTypical; ASTM D412
Elongation at break100%Typical; ASTM D412

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