Item Name: Stobicast® L 781.68
Manufacturer: Stockmeier Urethanes GmbH & Co. KG
Technologies: 2-component polyurethane casting compound
Color: Black
Cure Type: Room temperature or accelerated by heat (e.g. 4 h at 100 °C)
Package Size: 200 L drums. Other sizes on request.
Shelf Life: 6 months
Stobicast® L 781.68 is an elastic two-component polyurethane casting compound offering outstanding insulation strength, flexibility, and chemical resistance. It is UL 94 V-0 certified as self-extinguishing, with a Relative Temperature Index (RTI) of 130 °C. The system satisfies IEC 60335 glow wire requirements, demonstrating GWFI and GWIT of 850 °C. Designed for reliable performance, it combines electrical insulation, mechanical durability, and compliance with RoHS and WEEE regulations, ensuring both safety and environmental compatibility.
Encapsulation and insulation of low-voltage transformers, EMI filters, sensors, and electronic components.
Ideal for electronic modules where high flexibility and dielectric strength are required.
Suitable for casting applications exposed to moisture and chemical agents.
Flame-retardant use in industrial and household electrical equipment.
(measured at 25 °C unless specified)
| Property | Polyol | Polyisocyanate | Mixture (Uncured) | Cured (16h/80 °C) |
|---|---|---|---|---|
| Density (g/cm³) | 1.48 | 1.22 | 1.42 | – |
| Viscosity (mPa·s) | 2250 | 100 | 700 | – |
| Mixing ratio (by weight) | 100 | 16.0 | – | – |
| Pot life (20 °C) | – | – | 3–90 min | – |
| Shore hardness (A) | – | – | – | 70 |
| Tensile strength (N/mm²) | – | – | – | 4 |
| Elongation at break (%) | – | – | – | 130 |
| Impact strength (kJ/m²) | – | – | – | 33 |
| Notched impact strength (kJ/m²) | – | – | – | 14 |
| Glass transition temp. (°C) | – | – | – | 0 |
| Dielectric strength (kV/mm) | – | – | – | 26 |
| Surface resistance (Ω) | – | – | – | 10¹⁴ |
| Volume resistivity (Ω·cm, 20 °C) | – | – | – | 10¹⁴ |
| Tracking resistance (CTI, V) | – | – | – | >600 |
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