W2119-2 Solvent-Free Impregnating Resin for High-Voltage Motors Insulating Varnish
Product Applications:
W2119-2 is a one-component, fast-curing Class F solventless impregnating insulating resin formulated from epoxy-modified heat-resistant unsaturated polyester resin, a specialized curing agent, and reactive diluents. It is specifically designed for vacuum pressure impregnation (VPI) of high-voltage motor windings.
W2119-2 offers excellent storage stability and impregnation processability, making it suitable for use with both low-resin-content and medium-resin-content mica tapes. The resin provides good heat resistance, excellent electrical insulation performance, high mechanical strength, and low dielectric loss, making it suitable for high-voltage motor insulation systems that require reliable electrical and mechanical protection.
- Description
- Technical Data
- FAQ
Description
Product Features:
· Epoxy-modified heat-resistant unsaturated polyester resin; thermal class: Class F, H
· Suitable for vacuum pressure impregnation (VPI) of Class F and H large and medium-sized high-voltage explosion-proof motors, and for the impregnation insulation treatment of other motor and electrical windings.
Physical Properties：
| Test Item | Specification |
| Appearance | Pale yellow transparent liquid, free of mechanical impurities |
| Viscosity: Ford Cup No.4 viscometer, 23±2℃ (s) | 20±5.0 |
| Acid value: (mgKOH/g) ≤ | 8 |
| Density: (g/cm³) | 1.04±0.05 |
| Gel time: Test tube method, 135±2℃ (min) | 4-7 |
| Dielectric strength: (MV/m) Normal state: After 24h water immersion: | ≥ 25 ≥ 22 |
| Volume resistivity: (Ω·m) Normal state: After water immersion: 180℃: | ≥ 1×10¹² ≥ 1×10¹¹ ≥ 1×10⁸ |
| Dissipation factor: (%) Normal state: 180℃: | ≤ 1 ≤ 3 |
| Storage stability: (Closed cup method) 50±2℃, 96h (viscosity increase multiple) ≤ | 1 |
| (1) The storage life of this product is 6 months (below 10℃). (2) Curing conditions for items 6 and 7 (varnish cake): 165±2℃ for 4h. (3) Reactive diluent: X-68. | |
Application Process (for reference, subject to actual customer usage conditions):
Preparation: The working solution viscosity for general products is between 20-40s; for products with higher requirements, a viscosity of 45±15s is recommended; for small electrical appliances, 12-18s is recommended. Under normal conditions, add more than 10% new resin monthly (timing based on actual usage) for long-term continuous use.
Process & Precautions：
| Process | Temperature / Pressure | Time |
| Workpiece Pre-baking | 120℃-125℃ | 4h |
| Workpiece Loading into Tank | 40℃ (referring to workpiece internal temperature) | |
| Evacuation | ≤133Pa | 2h |
| Resin Feeding | 18℃-20℃ (referring to resin temperature, max. should not exceed 30℃) | |
| Pressurization | 0.5-0.7MPa | 3-4h (Pressurizing medium should preferably be dry air or nitrogen; filtered air may also be used) |
| Drip Coating | 25-40min | |
| Baking
| 140-150℃ (Stage 1) | 2h |
| 160-170℃ (Stage 2) | 8-12h (Baking time to be determined based on workpiece size and temperature resistance requirements) |
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 W2119-2?
The standard MOQ for W2119-2 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?
W2119-2 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 W2119-2 used for?
W2119-2 is a one-component, fast-curing Class F solventless impregnating insulating resin designed for vacuum pressure impregnation (VPI) of high-voltage motor windings. It is suitable for insulation systems using low-resin-content and medium-resin-content mica tapes.
Is W2119-2 suitable for VPI applications?
Yes. W2119-2 is specifically designed for compatible vacuum pressure impregnation (VPI) processes used in high-voltage motor insulation systems. Its good impregnation processability supports the treatment of motor windings and mica tape insulation structures.
Is W2119-2 suitable for Class F insulation systems?
Yes. W2119-2 is a Class F heat-resistant impregnating insulating resin designed for electrical insulation applications that require reliable heat resistance, electrical insulation performance, and mechanical strength.
Does W2119-2 require baking or heat curing?
W2119-2 is a fast-curing insulating resin. 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 VPI process.
What are the recommended VPI and curing parameters?
Recommended viscosity, preheating conditions, vacuum level, impregnation time, pressure, draining time, curing temperature, and curing time should be confirmed based on your equipment, winding structure, mica tape system, and production requirements. Please refer to the Technical Data Sheet (TDS) or contact our technical team for verified application guidance.
Is W2119-2 compatible with different mica tapes?
Yes. W2119-2 is suitable for both low-resin-content and medium-resin-content mica tapes. Compatibility testing is recommended before mass production to confirm performance with the selected mica tape, bonding materials, and complete insulation system.
What are the main performance characteristics of W2119-2?
W2119-2 offers excellent storage stability and impregnation processability, good heat resistance, excellent electrical insulation performance, high mechanical strength, and low dielectric loss. These properties make it suitable for high-voltage motor insulation systems.
What is the shelf life of W2119-2?
W2119-2 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 W2119-2 be stored?
Store W2119-2 in its original, unopened packaging in a cool, dry, and well-ventilated area. Keep the pail 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).
Does W2119-2 meet environmental compliance requirements?
W2119-2 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 assist with resin selection, VPI process evaluation, mica tape compatibility testing, curing-process optimization, and high-voltage motor insulation manufacturing requirements.