Impregnating Varnishes
1140 Solvent-Free Impregnating Varnish
Class F solvent-free resin with fast cure and strong coil bonding
1140 is a fast-curing, solvent-free impregnating resin with good storage stability, high mechanical strength after cure and firm coil bonding. Suitable for Class B and Class F motor and electrical appliance coils.
Class F (155°C)Solvent-freeBond strength ≥60 N
- Temperature class
- Class F (155°C)
- Viscosity
- 20–50 s
- Gel time (140°C)
- 2–6 min
- Processes
- VPI, trickle, vacuum
Request a quotation or a sample. Tell us thickness, width, temperature class, quantity and delivery form. We reply within one business day.
Technical data
| Property | Unit | Value |
|---|---|---|
| Appearance | — | Transparent liquid, free of mechanical impurities |
| Viscosity (No. 4 cup, 23 ±1°C) | s | 20–50 |
| Gel time (140 ±2°C) | min | 2–6 |
| Volatile matter during curing (140 ±2°C, 3 h) | % | ≤20 |
| Stability in open container (50 ±2°C, 96 h) | — | Viscosity increase ratio ≤4 |
| Lamination curing ability (140 ±2°C, 4 h) | — | Uniform, no worse than S1, U1, R3.2 |
| Effect of resin on enamelled wire | — | Pencil hardness ≥2H |
| Bonding strength (helical coil, normal) | N | ≥60 |
| Power-frequency electric strength, normal | MV/m | ≥20 |
| Volume resistivity, normal | Ω·m | ≥1×10¹³ |
| Volume resistivity, 23 ±2°C water 24 h | Ω·m | ≥1×10¹¹ |
| Volume resistivity, at 155 ±2°C | Ω·m | ≥1×10⁹ |
| Temperature class | — | Class F (155°C) |
Values are typical values or ranges from our product data. Bulk supply is subject to the approved specification, sample and test report. If a parameter you need is not listed here, ask our engineers for the full test report for that grade.
Key features
- Solvent-free system with fast cure for VPI and trickle processes.
- Strong coil bonding and high mechanical strength after cure.
- Suitable for Class B and F, reducing varnish inventory.
Applications
Impregnation of Class B/F motor and appliance coils; VPI, trickle and vacuum impregnation.
Electric Motors & GeneratorsDry-Type TransformersSwitchgear & Electrical Equipment
Why it fits
No solvent means no voids left behind when the film shrinks - better mechanical integrity on VPI and trickle lines.
Ordering information
To receive a quotation, please confirm:
- Product and grade
- Thickness and width (and roll or sheet size)
- Temperature class
- Quantity and delivery form (roll / sheet / die-cut / machined)
- Destination port and required delivery date
For machined parts, attach a drawing in PDF, DWG or STEP format. Datasheets, COAs and batch test data are available on request.
Related materials
Often specified together
Send your specification
Our export team reviews the application, the process and the existing specification before recommending a construction.