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Dolphs Aqua-Therm BC-380/870-D 20 L, Water-Based Epoxy Baking Varnish for winding impregnation, low VOC
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Description
Dolphs Aqua-Therm BC-380/870-D 20L is a water-based epoxy baking varnish designed for impregnation and protection of components used in electrical equipment. Based on an epoxy emulsion, it delivers strong mechanical and electrical performance as well as chemical resistance, with a low VOC content. It is used in applications such as transformers, stators, rotors and windings.
Advantages and unique features
- Low VOC content and reduced environmental impact.
- High bond strength and excellent abrasion resistance.
- Superior moisture and water resistance.
- Excellent chemical resistance (including resistance to Freon R22).
- High flash point > 100°C – reduced fire risk.
- UL certified and included in an Electrical Insulation System (EIS) rated 180°C.
Properties and applications
- Product type: water-based epoxy baking varnish (impregnation).
- Applications: transformers, rotors, random wound coils, electric devices, hermetic duty motors, stators, laminations.
- Dilution: can be used as supplied or diluted by up to 70% with tap water, depending on the application.
- Preparation: mix in the original container before use; for dip tanks, mixing twice daily for a few minutes is recommended to reduce sedimentation.
- Compatibility: compatible with most magnet wire enamels; for polyurethane enamels, preliminary tests are recommended.
Technical parameters
| Parameter | Value |
|---|---|
| Type / base | Water-based epoxy emulsion, baking varnish |
| Colour | White |
| Specific gravity @ 25°C | 1020 ± 30 g/L |
| Viscosity Ford No 4 @ 25°C | 14–24 s |
| Viscosity Ford No 2 @ 25°C | 50–60 s |
| Viscosity ISO No 3 @ 25°C | 50–80 s |
| Flash point | > 100°C |
| Thinner | Tap water |
| Shelf life @ 25°C (closed containers) | Minimum 10 months |
| Bond strength (helical coil) @ 25°C | 170 N |
| Bond strength (helical coil) @ 180°C | 38 N |
| Electric strength, dry | 2500 ± 200 V / 0.025 mm |
| Chemical resistance – water | Excellent |
| Chemical resistance – 10% sulphuric acid | Excellent |
| Refrigerant extractable (NEMA RE2, Freon R22) | 0.003% |
| Humidity test (ISO 7260-1980, 200 h) | No blistering |
| Cure schedule (after reaching temperature) | 1.5–2 h @ 170°C; 3–5 h @ 150°C; 5–8 h @ 135°C |
| UL | UL Certified – File OBOR2.E317427; UL Electrical Insulation System 180°C – File OBOR2.E317429 |
| Pack size | 20 L |
Storage recommendations
Keep the product away from direct sunlight and heat sources. The varnish is susceptible to cold—store indoors between 10–30°C. Do not allow the product to freeze.
FAQ
1) What is Dolphs Aqua-Therm BC-380/870-D used for?
For impregnation and protection of components in electrical equipment, such as windings, stators, rotors and transformers.
2) Can it be diluted?
Yes. It can be used as supplied or diluted by up to 70% with tap water, depending on the process.
3) How does curing (baking) work after impregnation?
Typical schedules are: 1.5–2 h at 170°C or 3–5 h at 150°C or 5–8 h at 135°C (time starts after the unit reaches curing temperature).
4) What are the colour and flash point?
The varnish is white and the flash point is above 100°C.
5) Is it compatible with magnet wire enamels?
It is compatible with most enamels; preliminary testing is recommended for polyurethane enamels.
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