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 / VB U 001/B
Manufacturer: Huntsman Advanced Materials
Technologies: Polyurethane, halogen-free, soft multipurpose system
Color: Beige, Black, Grey (polyol); Brown (isocyanate)
Cure Type: Room temperature or accelerated heat curing
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.
Arathane® VB U 6942 / VB U 001/B is a halogen-free polyurethane casting and impregnating system designed for room-temperature processing and curing.
Soft multipurpose polyurethane, suitable for pressure-sensitive devices.
Available in beige, black, and grey.
Key features: halogen-free, good thermal shock resistance, UL 94 V-0 flame retardancy.
Transformers
Filters
Capacitors
Other electrical devices requiring casting/impregnation
Processing methods: Casting / Impregnating, either manually or using automatic mixing and dosing equipment.
| Component | Description | Viscosity (25°C, mPa·s) | Specific Gravity (g/cm³) | Appearance |
|---|---|---|---|---|
| Arathane® VB U 6942 (NC) | Polyol, mineral filler | 3500 – 6000 | 1.47 – 1.51 | Beige liquid |
| Arathane® VB U 6942 (BK) | Polyol, mineral filler | 3500 – 6000 | 1.47 – 1.51 | Black liquid |
| Arathane® VB U 6942 (Grey) | Polyol, mineral filler | 3500 – 6000 | 1.48 – 1.52 | Grey, viscous liquid |
| Arathane® VB U 001/B | Isocyanate | 100 – 160 | 1.23 | Brown liquid |
| Property | Test Method | Value |
|---|---|---|
| Mix ratio (pbw) | — | 100 : 16 (Polyol : Isocyanate) |
| Mix ratio (vol) | — | 100 : 19 |
| Mix viscosity at 25°C | Rheomat | 3300 mPa·s |
| Gel time at 23°C | ISO 3532 / 9396 | 40 – 75 min (depending on grade) |
| Pot life (to 5000 mPa·s) | Rheomat | 35 min |
| Minimum curing cycle | — | 24h at RT or 6h at 80°C |
| Property | Test Method | Value |
|---|---|---|
| Glass transition temp. | ISO 6721 | 20 °C |
| 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/mK |
| Hardness | DIN 53505 | Shore A 87 / D 40 |
| Flammability | UL 94 (6.4 mm) | V-0 |
| Water absorption (23°C, 1 day) | ISO 62/80 | 0.13 % |
| Water absorption (25°C, 10 days) | ISO 62/80 | 0.45 % |
| Water absorption (100°C, 30 min) | ISO 62/80 | 0.29 % |
| Property | Test Method | Value |
|---|---|---|
| Dielectric strength (2 mm) | IEC 60243-1 | 22 kV/mm |
| Dielectric loss factor (50Hz, 25°C) | IEC 60250 | 0.13 % |
| Dielectric constant (εr, 50Hz, 25°C) | IEC 60250 | 5.5 |
| Volume resistivity (25°C) | IEC 60093 | 10¹⁴ Ω·cm |
| Tracking resistance | IEC 112/79 | CTI > 600 |
Electric Motor Reliability with Huntsman ARALDITE® Encapsulation Potting – Casting
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