E57-160F Solvent-Free Insulating Varnish
Product Applications:
E57-160F is a solvent-free, two-component electrical insulating varnish formulated from modified unsaturated polyester resin, styrene reactive diluent, and an initiator. The two-component system provides fast curing and excellent penetration, making it suitable for efficient impregnation insulation processes.
E57-160F offers good storage stability and is designed for the electrical insulation treatment of transformers, motors, electronic components, and other compatible electrical equipment. It is RoHS- and REACH-compliant, halogen-free, and suitable for manufacturers seeking a solvent-free and environmentally responsible insulating varnish solution.
- Description
- Technical Data
- FAQ
Description
Product Features:
· Modified unsaturated polyester resin, reactive diluent (styrene), initiator
· High adhesion between transformer components; reduces electromagnetic vibration and electrical noise of the transformer
· Excellent fast-curing performance; can be fully cured in a short time
· No solvent volatilization, reducing environmental pollution
· Thermal class: Class F (155℃)
· Compliant with EU RoHS and REACH; halogen-free, environmentally friendly
· Matching thinner: X-58
· Matching curing agent: G160F, G160F-2
· Recommended ratio: varnish : thinner : curing agent = 100 : 0-200 : 2
Physical Properties：
| Item | Specification | ||||
| Varnish Properties | Appearance | Visual | Yellow, transparent liquid | ||
| Viscosity (Tu-4 Cup) | 25℃, s | 18-22 | |||
| Specific Gravity | 25℃ | 0.99±0.02 | |||
| Gel Time | 100℃, min | ≥5.0 | |||
| Pot Life | 40℃, days | ≥5 days | |||
| Drying Time | Galvanized iron sheet | 100-120℃, min | ≤20 | ||
| Cured Film Properties | Volume Resistivity | Normal state, Ω·m | 4×1013 | ||
| Dielectric Breakdown Strength | Normal state | KV/mm | 20.5 | ||
| Shear Adhesion (using Ф2.0mm PEW) | 23℃ | N | ≥300 | ||
| Curing Conditions | – | 110℃/3h or 120℃/2h | |||
Example of varnish impregnation conditions (Model EI-66, using an automatic impregnation and drying system)
| Treatment Item | Unit | treatment conditions |
| Preheating | ℃/min | 110/10～20 |
| Air cooling | min | 5～10 |
| Impregnation | min | 2～5 |
| Drip removal | min | 5～20 |
| Curing | ℃/min | 120/60 |
In actual application, the customer should determine the production conditions, such as dilution ratio, impregnation time and curing time, through experiments according to the shape, size and process of the transformer to be impregnated.
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 E57-160F?
The standard MOQ for E57-160F is 18 kg (one pail). For trial quantities below the standard MOQ, please contact us for sample availability and a customized quotation.
What packaging is available?
E57-160F is supplied in the following standard packaging:
- 18 kg per pail
Please contact us for bulk-order pricing, export packaging, or customized packaging requirements.
Can I request a sample before placing a bulk order?
Yes. Free samples 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 E57-160F used for?
E57-160F is a solvent-free, two-component electrical insulating varnish designed for impregnation insulation applications. It is suitable for various transformers, motors, electronic components, and other compatible electrical equipment.
What are the main features of E57-160F?
E57-160F offers fast curing, excellent penetration, and good storage stability. Its solvent-free two-component formulation is suitable for electrical insulation processes that require efficient impregnation and reliable curing performance.
Is E57-160F suitable for transformer and motor impregnation?
Yes. E57-160F is suitable for the impregnation insulation of compatible transformers, motors, coils, windings, electronic components, and other electrical products.
Is E57-160F a two-component insulating varnish?
Yes. E57-160F is a two-component insulating varnish. The components should be mixed and used according to the specified mixing ratio, preparation procedure, and working time provided in the Technical Data Sheet (TDS).
Does E57-160F require baking or heat curing?
E57-160F is a fast-curing insulating varnish. The specific curing method and whether baking or heat curing is required should be confirmed according to the product Technical Data Sheet (TDS) and your actual impregnation process.
What are the recommended impregnation and curing parameters?
Recommended mixing ratio, viscosity, pot life, impregnation method, impregnation time, draining time, curing temperature, and curing time should be confirmed based on your equipment, component structure, and production requirements. Please refer to the Technical Data Sheet (TDS) or contact our technical team for verified application guidance.
Is E57-160F compatible with different electrical insulation materials?
E57-160F is designed for electrical insulation applications. However, compatibility testing is recommended before mass production, especially with magnet wire enamel, insulation paper, mica tapes, tapes, bobbins, sleeves, adhesives, plastics, and other materials used in the insulation system.
Is E57-160F solvent-free and halogen-free?
Yes. E57-160F is formulated as a solvent-free, halogen-free insulating varnish. Please refer to the product Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for detailed composition, safety, and compliance information.
Is E57-160F RoHS and REACH compliant?
Yes. E57-160F is RoHS- and REACH-compliant. Please contact us if you require declarations, test reports, or other compliance documents for your project.
What is the shelf life of E57-160F?
E57-160F has a shelf life of 6 months from the manufacturing date when stored unopened under recommended conditions. Please check the product label or contact us for batch-specific information.
How should E57-160F be stored?
Store E57-160F in its original, unopened packaging in a cool, dry, and well-ventilated area. Keep the container tightly sealed when not in use and follow the storage and handling instructions provided in the Technical Data Sheet (TDS) or Safety Data Sheet (SDS).
Can you provide technical and compliance documents?
Technical and quality documents may include the Technical Data Sheet (TDS), Safety Data Sheet (SDS), Certificate of Analysis (COA), RoHS documentation, REACH documentation, and halogen-free declarations. Please contact us to confirm the documents required for your project.
Do you provide technical support?
Yes. Our technical team can assist with varnish selection, component-mixing guidance, impregnation-process evaluation, curing-process optimization, material compatibility testing, and electrical insulation manufacturing requirements.