Applications

CoolTherm® SC-324 – Thermally conductive silicone encapsulant for electronics ensuring protection, flame resistance and long-term reliability

Item Name: CoolTherm® SC-324
Manufacturer: Parker Lord (a Parker Hannifin brand)
Technologies: Two-component silicone, addition-curing polydimethylsiloxane polymer
Color: Resin – Pink liquid; Hardener – White liquid; Mixed – Light pink liquid
Cure Type: Room temperature cure (24h at 25°C) or accelerated cure (60 min at 125°C)
Package Size: Contact to Techniq VN for details.
Shelf Life: 6 months

1. Product Overview

CoolTherm® SC-324 is a two-component thermally conductive silicone encapsulant engineered for electronic and electrical encapsulation. It combines high thermal conductivity with low viscosity, ensuring effective flow and void-free coverage around components. With an addition-curing PDMS base, the system delivers low shrinkage and stress, excellent durability under thermal cycling, and strong flame retardancy (UL 94 V-0). Its optimized balance of mechanical and electrical properties makes it suitable for high-performance and safety-critical applications.


2. Applications

  • Encapsulation of sensitive electrical/electronic components requiring thermal management.

  • High-volume production using meter/mix/dispense systems.

  • Applications demanding low viscosity for ease of potting and minimal void formation.

  • Suitable for high-voltage or critical systems when used with vacuum degassing.

  • Designed for environments requiring flame resistance, moisture protection, and thermal shock durability.

3. Typical Properties

Property SC-324 Resin SC-324 Hardener Mixed
Appearance Pink Liquid White Liquid Light Pink Liquid
Viscosity, cP @ 25°C 37,000 43,000 30,000
Specific Gravity 3.25 3.25 3.25
Working Life @ 25°C 30 min

Cured Properties

  • Thermal Conductivity: 4.0 W/m·K

  • Coefficient of Linear Thermal Expansion: 105 ppm/°C

  • Hardness: Shore A 50

  • Tensile Strength: 0.82 MPa (119 psi)

  • Elongation at Break: 10%

  • Moisture Absorption: <0.1%

  • Volume Resistivity: >2 × 10¹³ ohm-cm

  • Dielectric Strength: 7.4 kV/mm (188 V/mil)

  • Dielectric Constant (1 MHz): 4.5

  • Dissipation Factor (1 MHz): <0.01

  • Extractable Ionic Contaminants (Cl⁻, Na⁺, K⁺, NH₄⁺, Br⁻, SO₄²⁻): <10 ppm each

CoolTherm® SC-324 offers strong thermal conductivity, electrical insulation, and reliability, making it highly effective for protecting and cooling encapsulated electronic systems.

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