E57C Baking-Type Insulating Varnish
Product Applications:
E57C is a baking-type electrical insulating varnish designed for oven-curing insulation applications in transformer manufacturing and electrical assembly.
It is primarily used for transformer impregnation, helping provide insulating protection for transformer windings and related components. E57C is also suitable for network transformer potting and encapsulation applications that require a baking-curing insulating varnish.
Typical applications include transformer winding insulation, small transformer production, network transformer assembly, and other electrical components requiring heat-cured insulation treatment.
- Description
- Technical Data
- FAQ
Description
Product Features:
· Alkyd-amino varnish
· Good tightening (bonding) properties
· Heat cross-linking cure
· Not prone to bubbling during baking
· Thermal class: Class B-F
Physical Properties：
| Item | Specification | |
| Varnish Properties | Appearance | Light yellow transparent liquid |
| Viscosity (25℃, Tu-4 Cup, s) | 60-90 | |
| Specific Gravity (25℃) | 0.98±0.03 | |
| Non-Volatile Content (120℃/2h, %) | 50±2 | |
| Drying Time (galvanized iron sheet) | Surface dry (120℃, min) | ≤30 |
| Full cure (120℃, min) | ≤120 | |
| Volume Resistivity | Normal state (Ω·m) | ≥1×1014 |
| After 24h Water Immersion (Ω·m) | ≥1×1013 | |
| Dielectric Strength | Normal State (kV/mm) | ≥70 |
| Thermal Class | Class B-F | |
| Matching Thinner | X-7F, X-7H | |
Precautions:
· The customer should determine the dilution ratio and baking time through experiments according to specific product requirements.
· 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 E57C?
The standard MOQ for E57C 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?
E57C 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 E57C used for?
E57C is a baking-type electrical insulating varnish primarily used for transformer impregnation, transformer-winding insulation, and compatible network-transformer insulation applications.
Is E57C suitable for network transformer potting?
E57C may be used for network-transformer potting or encapsulation applications when the component design, filling requirements, and curing process are compatible with the product. Please contact our technical team to confirm suitability for your specific potting process before mass production.
Does E57C require oven baking?
Yes. E57C is designed to cure through a baking process. Oven curing supports the formation of a stable insulating layer on transformer windings and compatible electrical components.
What are the recommended baking conditions?
Recommended baking temperature and curing time depend on the coating or filling thickness, transformer design, oven type, airflow, and production requirements. Please refer to the Technical Data Sheet (TDS) or contact us for verified process recommendations.
What application methods can be used?
E57C may be suitable for transformer impregnation, dipping, vacuum impregnation, brushing, or other appropriate application methods, depending on your manufacturing process. Please conduct process testing before mass production.
Is E57C suitable for transformer winding insulation?
Yes. E57C is designed for transformer impregnation and winding-insulation applications. Final performance should be verified based on the wire enamel, bobbin material, insulation system, operating temperature, and curing process.
What is the shelf life of E57C?
E57C 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 E57C be stored?
Store E57C 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. Please refer to the Safety Data Sheet (SDS) for complete storage and handling instructions.
Can you provide technical and compliance documents?
Yes. Available documents may include the Technical Data Sheet (TDS), Safety Data Sheet (SDS), Certificate of Analysis (COA), and applicable compliance documentation. Please contact us to request the documents needed for your project.
Do you provide technical support?
Yes. Our technical team can assist with transformer impregnation processes, material compatibility, baking-process optimization, application-method selection, and network-transformer assembly requirements.