Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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Item Name: Araldite® CY 220-1/CY 221 with Hardener HY 956 EN
Manufacturer: Huntsman Advanced Materials
Technologies: Modified solvent-free epoxy resin casting system with aliphatic polyamine hardener
Color: CY 220-1 – Pale yellow liquid; CY 221 – Clear liquid; HY 956 EN – Clear light yellow liquid; Castings – Yellowish to grey
Cure Type: Room temperature or elevated temperature curing
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
Araldite® CY 220-1 / CY 221 with Hardener HY 956 EN is a casting resin system designed for room temperature or slightly elevated temperature curing. The system offers excellent electrical insulation, high filler addition capability, and low shrinkage, with flexibility and rigidity tailored by adjusting the ratio between CY 220-1 (medium viscosity, more rigid) and CY 221 (low viscosity, more flexible). It demonstrates low cracking tendency, high dielectric strength, and suitability for encapsulating electronic components.
Encapsulation and potting of low-voltage and electronic components.
Electrical insulation for light electrical applications.
Casting and processing with high filler loadings to improve thermal and mechanical properties.
Adaptable to requirements:
CY 221 → flexible castings.
CY 220-1 → rigid castings.
Compatible with fillers (silica, alumina, aluminium hydroxide, etc.) for enhanced strength, reduced shrinkage, and improved thermal conductivity.
| Component | Appearance | Viscosity (25°C) | Specific Gravity (25°C) | Flash Point (°C) | Epoxy Content (Eq/kg) |
|---|---|---|---|---|---|
| Araldite CY 220-1 | Pale yellow liquid | ~5000 mPa·s | 1.15 | 190–200 | 5.0 |
| Araldite CY 221 | Clear liquid | ~450 mPa·s | 1.15 | 190–200 | 4.05 |
| Hardener HY 956 EN | Clear light yellow liquid | ~450 mPa·s | 1.02 | 175–185 | – |
| System | Mix Ratio (pbw) | Initial Viscosity @25°C (mPa·s) | Pot Life (100 g @25°C, min) | Min. Cure Time @25°C | Min. Cure Time @40°C | Min. Cure Time @60°C | Min. Cure Time @80°C |
|---|---|---|---|---|---|---|---|
| 1 | CY 220-1:100 + HY 956 EN:25 | 2250 | 25 | 24 h | 8–10 h | 3–4 h* | 1–2 h* |
| 2 | CY 221:100 + HY 956 EN:20 | 450 | 110 | 24–36 h | 10–12 h | 4–6 h* | 2–3 h* |
| 3 | CY 220-1:100 + HY 956 EN:25 + Silica 140 | 14,000 | 15 | 24 h | 8–10 h | 3–4 h* | 1–2 h* |
| 4 | CY 221:100 + HY 956 EN:20 + Silica 140 | 4000 | 100 | 24–36 h | 10–12 h | 4–6 h* | 2–3 h* |
*Large castings should be pre-cured at room temperature before oven cure.
| Property | System 1 | System 2 | System 3 | System 4 |
|---|---|---|---|---|
| Colour | Yellowish | Yellowish | Grey | Grey |
| Specific Gravity (g/cm³) | 1.15 | 1.15 | 1.62 | 1.74 |
| Shore D Hardness | 80 | 34 | 85 | 42 |
| Flexural Strength (MPa) | 120 | – | 80 | – |
| Impact Strength (kJ/m²) | 50 | – | 6 | – |
| Compressive Strength (MPa) | 95 | – | 130 | 85 |
| Tensile Strength (MPa) | 70 | 6 | 30 | 10 |
| Elongation at Break (%) | 4 | 45 | 0.5 | 8 |
| Martens Deflection Temp. (°C) | 75 | <25 | 75 | <25 |
| Water Absorption (10d, 23°C) % | 0.4 | 4.0 | 0.25 | 1.7 |
| Electric Strength (kV/mm, 2mm plate) | 21 | 18 | 21 | 19 |
| Tracking Resistance (IEC 112) | CTI > 600 | CTI > 600 | CTI > 600 | CTI > 600 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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