Applications

Araldite® CY-221 and Aradur® HY 2966

Technology: Low-viscosity, unfilled epoxy casting resin system, curing at room temperature with high filler addition capability.

Product code: Huntsman Araldite® CY-221 / Aradur® HY 2966

Manufacturer: Huntsman

Package Size: Available in various sizes (kg or pail)

Shelf life: To know more, contact Avantek

Araldite® CY-221 and Aradur® HY 2966


1. Product Overview

Araldite® CY-221 is a low-viscosity, unfilled epoxy casting resin, while Aradur® HY 2966 is a low-viscosity polyamine hardener. This system cures at room temperature and allows for high filler addition, making it versatile for various applications. It provides good heat resistance, crack resistance, and resistance to atmospheric and chemical degradation.


2. Applications

  • Encapsulation and potting of low-voltage and electronic components
  • Casting and vacuum casting

3. Typical Properties of Components

Property Araldite® CY-221 (Resin) Aradur® HY 2966 (Hardener)
Appearance Clear liquid Clear liquid
Viscosity at 25°C (mPa·s) 355 – 475 300 – 600
Specific Gravity at 25°C (g/cm³) 1.15 0.97
Epoxy Index (Eq/kg) 3.95 – 4.20

4. Typical Properties After Mixing

Property Value
Mix Ratio (pbw) 100:25
Mix Ratio (pbv) 100:30
Mixed Viscosity at 25°C (mPa·s) 490
Mixed Viscosity at 40°C (mPa·s) 205
Pot Life at 25°C (min) 117
Pot Life at 40°C (min) 54
Gel Time at 25°C (min) 120
Gel Time at 40°C (min) 45
Gel Time at 60°C (min) 10
Curing Time 24-48h at RT or 4h at RT + 4h at 60°C
Glass Transition Temperature (°C) 29
Thermal Class (IEC 60085) B
Storage Modulus (MPa) 72
Tensile Modulus (MPa) 14
Tensile Strength (MPa) 8
Elongation at Break (%) 60
Thermal Conductivity (W/m·K) 0.15
Shore D Hardness 25
Water Absorption (%) 0.7 (1 day at 23°C), 2.18 (10 days at 23°C), 0.88 (30 min at 100°C)
Dielectric Strength (kV/mm, 2mm) 36
Dielectric Loss Factor (tan δ, 50Hz) 7.6%
Dielectric Constant (εr, 50Hz) 5.4
Volume Resistivity (Ω·cm at 25°C) 10¹⁴
Comparative Tracking Index (CTI) >600
Electrolytic Corrosion Resistance Grade AN/1

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