E57A Baking-Type Insulating Varnish
Product Applications:
E57A is a baking-type electrical insulating varnish designed for applications that require oven curing. After the recommended baking process, it forms an insulating coating for electrical components and assemblies.
E57A is widely used in the manufacture and protection of small and medium-sized transformers, small and medium-sized electric motors, motor windings, and other electrical products. It is suitable for electrical insulation applications in transformer production, motor manufacturing, and general electrical equipment assembly.
- Description
- Technical Data
- FAQ
Description
Product Features:
· Alkyd-amino varnish
· Good tightening (bonding) properties
· Fast internal drying
· Thermal class: Class B-F (130℃-155℃)
Physical Properties：
| Item | Specification | |
| Varnish Properties | Appearance | Yellow transparent liquid |
| Viscosity (25℃, Tu-4 Cup, s) | 40-60 | |
| Specific Gravity (25℃) | 0.99±0.05 | |
| Non-Volatile Content (120℃/2h, %) | 50±2 | |
| Drying Time
| Full cure: 110℃, H | 3-5 h |
| Full cure: 120℃, H | 2-4 h | |
| Volume Resistivity | Normal State (Ω·m) | ≥1×1014 |
| After 24h Water Immersion (Ω·m) | ≥1×1013 | |
| Dielectric Strength | Normal State (kV/mm) | ≥60 |
| Thermal Class | Class B-F | |
| Matching Thinner | X-7 series | |
Precautions:
· The customer should determine the dilution ratio and baking time through experiments according to the specific shape and size requirements of the product.
· This product tends to absorb moisture and turn white in high humidity; this does not affect product performance 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 E57A?
The standard MOQ for E57A 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?
E57A is supplied in the following standard packaging:
- 18 kg per pail
Please contact us for bulk-order pricing, OEM labeling, 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.
What is E57A used for?
E57A is a baking-type electrical insulating varnish designed for small and medium-sized transformers, small and medium-sized electric motors, motor windings, and other electrical products requiring an oven-curing insulation process.
Does E57A require oven baking?
Yes. E57A is designed to be cured through a baking process. Oven curing supports the formation of a stable insulating coating on compatible electrical components and assemblies.
What are the recommended baking conditions?
The recommended baking temperature and curing time depend on factors such as coating thickness, component size, oven type, airflow, and production requirements. Please refer to the Technical Data Sheet (TDS) or contact our technical team for verified process recommendations.
What application methods can be used?
E57A may be suitable for dipping, brushing, spraying, or other appropriate varnish-application methods, depending on your manufacturing process. Please conduct process trials before mass production.
Is E57A suitable for transformer and motor manufacturing?
Yes. E57A is intended for insulating applications in transformer production, motor manufacturing, winding protection, and general electrical equipment assembly. Final suitability should be verified under actual operating and curing conditions.
What is the shelf life of E57A?
E57A 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 E57A be stored?
Store E57A in a cool, dry, and well-ventilated place away from direct sunlight, heat, sparks, open flames, and other ignition sources. Keep the pail tightly sealed when not in use. Refer to the Safety Data Sheet (SDS) for detailed storage and handling requirements.
Can you provide technical documents?
Yes. Available documents may include the Technical Data Sheet (TDS), Safety Data Sheet (SDS), Certificate of Analysis (COA), and other applicable product documentation. Please contact us to request the documents required for your project.
Do you provide technical support?
Yes. Our technical team can provide guidance on varnish selection, transformer or motor compatibility, baking-process optimization, application methods, and production-line requirements.