E57-180 High-Temperature Resistant Air-Dry Insulating Varnish
Product Applications:
E57-180 is a high-temperature-resistant, air-drying electrical insulating varnish developed for coil treatment and insulation protection in medium- and large-sized electrical equipment operating at elevated temperatures. It is suitable for transformer windings, generator coils, new energy vehicle (NEV) motor windings, and motor stator coils.
Typical applications include large transformers, large generators, NEV motors, and other industrial electrical equipment requiring reliable high-temperature coil insulation.
- Description
- Technical Data
- FAQ
Description
Product Features:
· Modified high-temperature polyester insulating varnish. Thermal Class H (≥180°C).
· High adhesion effectively reduces electromagnetic vibration and electrical noise in coils; rapid curing.
· Thermal expansion coefficient between metal and insulation adjusts with temperature variations, minimizing coil damage from thermal stress.
· Excellent resistance to both high and low temperatures (-40°C to 180°C); film retains flexibility.
· Compliant with EU RoHS and REACH standards; halogen-free, benzene-free, environmentally friendly.
· Superior flexibility and insulation performance.
Physical Properties：
| Item | Specification | |
| Thermal Class | Class H (180℃) | |
| Properties | Specification | |
| Varnish Properties | Viscosity (25℃, Tu-4 Cup) | 20±5.0 |
| Specific Gravity (25℃) | 0.975±0.03 | |
| Non-Volatile Content (105℃/3h, %) | 46±3.0 | |
| Appearance | Varnish Appearance (25℃, Visual) | Brown translucent liquid |
| Film Color (25℃, Visual) Film State (25℃, Visual) | Yellow, transparent Smooth | |
| Drying Properties | Surface Drying (110℃, min) | ≤5 |
| Internal Drying (110℃, h) | ≤4 | |
| Surface Dry (25℃) | ≤20 min | |
| Full Cure (25℃) | 7 days | |
| Volume Resistivity | Normal State (Ω·m) | 8.5×1013 |
| After 24h Water Immersion (Ω·m) | 2.2×1013 | |
| Dielectric Strength | Normal State (kV/mm) | 132 |
| After 24h Water Immersion (kV/mm) | 116 | |
| Breakdown Voltage | Twisted Pair (TP) Ф=1.0mm AIW (kV) | 16 |
| Film Thickness (mm) | ≥0.05 | |
| Thinner | X-86 series, X-12 series | |
| Shelf Life (at 40℃) | 6 months | |
Precautions:
· Determine the dilution ratio, baking temperature, and baking time experimentally based on product shape, size, and specific requirements. Recommended baking temperature: do not exceed 100°C.
· The product may absorb moisture and turn whitish under high humidity; performance remains unaffected after baking.
· This product is flammable; keep away from fire and heat sources.
Packaging, Storage/Transport & Shelf Life：
· Packaging: metal pails, 18 KG/pail
· Storage & transport: flammable chemical — keep away from fire and heat; handle per regulations; store cool (RT), dark and dry.
· Shelf life: stored sealed, 6 months at 5-25℃.
Frequently Asked Questions
What is the minimum order quantity (MOQ) for E57-180?
The standard MOQ for E57-180 is one 18 kg pail. For trial quantities below the standard MOQ, please contact us for sample availability and a customized quotation.
What packaging is available?
E57-180 is supplied in the following standard packaging:
- 18 kg per pail
Please contact us for bulk-order pricing, OEM labeling, export packaging, or customized packaging requirements.
Can I request a sample before placing a bulk order?
Yes. Free samples of E57-180 are available for quality evaluation and application testing. Please contact us to confirm sample availability and quantity. The customer is responsible for shipping costs and related delivery charges.
What is E57-180 used for?
E57-180 is a high-temperature-resistant, air-drying electrical insulating varnish designed for coil treatment and insulation protection in medium- and large-sized electrical equipment operating at elevated temperatures. Typical applications include large transformers, large generators, new energy vehicle (NEV) motors, motor windings, and motor stator coils.
Is E57-180 suitable for large transformers and generators?
Yes. E57-180 is designed for insulation treatment of coils and windings used in large transformers, large generators, and other medium- and large-sized electrical equipment that require reliable high-temperature insulation performance.
Is E57-180 suitable for NEV motors and motor stator coils?
Yes. E57-180 is suitable for coil treatment and insulation protection of new energy vehicle (NEV) motors, motor windings, and stator coils. Please verify product compatibility and performance under your actual operating conditions before mass production.
Is E57-180 an air-drying insulating varnish?
Yes. E57-180 is an air-drying electrical insulating varnish. It is designed for applications requiring high-temperature-resistant coil insulation without relying solely on oven-baking curing.
Can E57-180 be heated to accelerate drying?
The suitability of heated drying, as well as the recommended drying temperature and drying time, should be confirmed according to the product Technical Data Sheet (TDS), coating thickness, component structure, and production process. Please contact our technical team for verified process guidance.
What are the recommended drying conditions for E57-180?
Recommended drying conditions should be determined based on coating thickness, substrate material, ambient temperature, ventilation, humidity, and production requirements. Please refer to the Technical Data Sheet (TDS) or contact our technical team for recommended process parameters.
What application methods can be used?
The appropriate application method for E57-180 should be selected according to the component design and production process. Please refer to the Technical Data Sheet (TDS) or contact our technical team to confirm suitable methods, such as brushing, dipping, spraying, or other applicable coating processes.
Is E57-180 suitable for coil and winding insulation?
Yes. E57-180 is designed for the treatment and insulation protection of electrical coils, transformer windings, generator coils, motor windings, and motor stator coils used in compatible electrical equipment.
What is the shelf life of E57-180?
E57-180 has a shelf life of 6 months from the manufacturing date when stored in the original unopened container under recommended conditions. Please check the product label or contact us for batch-specific information.
How should E57-180 be stored?
Store E57-180 in its original unopened packaging and keep the pail tightly sealed when not in use. Please follow the storage and handling requirements provided in the Technical Data Sheet (TDS) and Safety Data Sheet (SDS).
Does E57-180 meet environmental compliance requirements?
E57-180 complies with applicable RoHS, REACH, and halogen-free requirements. Technical and compliance documents, including TDS, SDS, COA, and available declarations, can be provided upon request.
Do you provide technical support?
Yes. Our technical team can provide guidance on insulating-varnish selection, component compatibility, application methods, air-drying conditions, process evaluation, and electrical insulation manufacturing requirements.