W2168H Eco-Friendly High-Temperature Resistant Impregnating Resin Insulating Varnish
Product Applications:
W2168H is a high-quality Class C heat-resistant impregnating insulating resin formulated from heat-resistant epoxy resin, modified heat-resistant unsaturated polyester resin, reactive diluents, specialized curing agents, and performance additives.
The resin features the “three lows” — low viscosity, low volatility, and low odor — which support easier impregnation and improved working conditions. W2168H offers good compatibility with medium-resin-content and low-resin-content mica tapes, with low VOC emissions during curing.
After curing, W2168H provides high mechanical strength, extremely low water absorption, and strong resistance to damp heat, salt spray, mildew, and moisture. It also maintains reliable performance at temperatures as low as -45°C and provides excellent resistance to refrigerants. With good storage stability, W2168H is suitable for demanding electrical insulation systems that require Class C heat resistance and long-term environmental durability.
- Description
- Technical Data
- FAQ
Description
Product Features:
Physical Properties：
The following items are tested in accordance with GB/T15022.2-2017 standard test methods:
| Test Item | Specification |
| Appearance | Pale yellow transparent liquid, free of mechanical impurities |
| Viscosity: Ford Cup No.4 viscometer, 25±2℃ (s) | 50-150 |
| Density: (g/cm³) | 1.05±0.03 |
| Gel time: Test tube method, 135±2℃ (min) | 3-12 |
| Thick-layer curing capability: 140±2℃, ≥2h | S₁, U₁, I₂.₁ |
| Dielectric strength: (MV/m) Normal state: After water immersion: | ≥ 23 ≥ 22 |
| Volume resistivity: (Ω·m) Normal state: After water immersion: | ≥ 1×10¹³ ≥ 1×10¹² |
| Dissipation factor: (%) Normal state: Hot state: | ≤ 1 ≤ 3 |
| Volatile content: 155±2℃ 2h ≤ | 5 |
| Tracking resistance: CTI (V) | 550 |
| Refrigerant resistance: 96h | Excellent |
| Storage stability: (Closed cup method) 50±2℃, 96h ≤ (viscosity increase multiple) | 1 |
| (1) The storage life of this product is 6 months. (2) High-purity eco-friendly reactive diluent: X-78, storage life is 3 months. (3) Curing conditions for items 6 and 7 (varnish cake): 150±2℃ for 10h. | |
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 | Time |
| Workpiece preheating | 115-130℃ | 2-6h |
| Impregnation | 45-50℃ | 15-30min |
| Drip coating | / | 20-40min |
| Baking | 145-150℃ | 4-8h (For products with higher requirements, it is recommended to add an additional 2-10h, or bake at 160℃ for 8h) |
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℃.
Insulating Varnish：
Frequently Asked Questions
What is the minimum order quantity (MOQ) for W2168H?
The standard MOQ for W2168H 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?
W2168H 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 W2168H used for?
W2168H is a Class C heat-resistant impregnating insulating resin designed for demanding electrical insulation applications. It is suitable for insulation systems that require low viscosity, low volatility, low odor, high mechanical strength, low water absorption, and resistance to moisture and harsh environmental conditions.
What are the main features of W2168H?
W2168H features the “three lows”: low viscosity, low volatility, and low odor. It also offers good storage stability, low VOC emissions during curing, high mechanical strength after curing, extremely low water absorption, and reliable electrical insulation performance.
Is W2168H suitable for Class C insulation systems?
Yes. W2168H is a Class C heat-resistant impregnating insulating resin designed for electrical insulation systems that require high thermal resistance and long-term insulation reliability.
Is W2168H compatible with mica tapes?
Yes. W2168H has good compatibility with medium-resin-content and low-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.
Does W2168H require curing?
Yes. W2168H is an impregnating insulating resin that requires curing as part of the electrical insulation process. The specific curing conditions should be confirmed according to the product Technical Data Sheet (TDS) and your actual production requirements.
What are the recommended impregnation and curing parameters?
Recommended viscosity, preheating conditions, impregnation method, impregnation time, draining time, curing temperature, and curing time should be confirmed based on your equipment, insulation structure, mica tape system, and production process. Please refer to the Technical Data Sheet (TDS) or contact our technical team for verified application guidance.
What environmental resistance does W2168H provide?
After curing, W2168H provides resistance to damp heat, salt spray, mildew, and moisture. It also has extremely low water absorption and maintains reliable performance at low temperatures down to -45°C.
Is W2168H resistant to refrigerants?
Yes. W2168H provides excellent resistance to refrigerants and is suitable for compatible electrical insulation applications that may be exposed to refrigerant environments. Please contact us for application-specific compatibility guidance.
What is the shelf life of W2168H?
W2168H 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 W2168H be stored?
Store W2168H 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 W2168H meet environmental compliance requirements?
W2168H 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, impregnation-process evaluation, mica tape compatibility testing, curing-process optimization, and electrical insulation manufacturing requirements.