Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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Item Name: Arathane® VB U 6942 / Arathane® VB U 001/B
Manufacturer: Huntsman Advanced Materials
Technologies: Halogen-free, two-component polyurethane system
Color: VB U 6942 – Beige / Black / Grey, VB U 001/B – Brown
Cure Type: Room-temperature curing (24h RT or 6h at 80°C)
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
Arathane® VB U 6942 (Polyol) with Arathane® VB U 001/B (Isocyanate) is a halogen-free, polyurethane casting and impregnating system designed for room temperature curing. It is a soft multipurpose polyurethane system suitable for pressure-sensitive devices and is available in various colors (beige, black, grey). The system provides good thermal shock resistance and achieves UL 94 V-0 flammability rating.
Encapsulation / casting of transformers
Impregnation of filters
Encapsulation of capacitors
Other electrical and electronic devices requiring a soft, halogen-free polyurethane system
Processing methods: Manual or automatic casting/impregnating with mixing and dosing equipment.
| Component | Appearance | Viscosity (25 ℃, mPa·s) | Density (g/cm³) |
|---|---|---|---|
| VB U 6942 (NC – Beige) | Beige liquid | 3500 – 6000 | 1.47 – 1.51 |
| VB U 6942 (BK – Black) | Black liquid | 3500 – 6000 | 1.47 – 1.51 |
| VB U 6942 (Grey) | Grey viscous liquid | 3500 – 6000 | 1.48 – 1.52 |
| VB U 001/B (Isocyanate) | Brown liquid | 100 – 160 | 1.23 |
Mixing ratio:
By weight → VB U 6942 : VB U 001/B = 100 : 16
By volume → VB U 6942 : VB U 001/B = 100 : 19
| Property | Condition | Value |
|---|---|---|
| Mix viscosity | 25 ℃ | 3300 mPa·s |
| Gel time | 23 ℃ | 40 – 70 min (NC) / 45 – 75 min (BK, Grey) |
| Pot life | — | ~35 min (to 5000 mPa·s) |
| Curing | Room temp: 24 h / Heat cure: 6 h at 80 ℃ |
| Property | Standard/Test | Value |
|---|---|---|
| Glass transition temperature | ISO 6721 | 20 ℃ |
| Shear modulus | ISO 6721 | 65 MPa |
| Tensile modulus | ISO 527 | 26 MPa |
| Tensile strength | ISO 527 | 4 MPa |
| Elongation at break | ISO 527 | 44 % |
| Thermal expansion (α₂) | ISO 11359-2 | 145 ppm/K |
| Thermal conductivity | ISO 8894-1 | 0.55 W/m·K |
| Hardness | DIN 53505 | 87 Shore A / 40 Shore D |
| Flammability | UL 94 (6.4 mm) | V-0 |
| Water absorption (1 day / 23 ℃) | ISO 62 | 0.13 % |
| Water absorption (10 days / 25 ℃) | ISO 62 | 0.45 % |
| Water absorption (30 min / 100 ℃) | ISO 62 | 0.29 % |
| Property | Standard/Test | Value |
|---|---|---|
| Dielectric strength (2 mm) | IEC 60243-1 | 22 kV/mm |
| Dielectric loss factor (tan δ) | IEC 60250 | 13 % |
| Dielectric constant (εr) | IEC 60250 | 5.5 |
| Volume resistivity (ρ) | IEC 60093 | 1 × 10¹⁴ Ω·cm |
| Tracking resistance (CTI) | IEC 112/79 | > 600 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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