NK 50/1K-30
APPLICATION
Impregnating resin NK 50/1K-30 is suitable for impregnation of windings of electrical rotating machines to temperature class C (220 °C UL tested E233982)
-explosion proof electrical machines
-standard motors
-small and medium size special machines
-motors for washing machines on continual impregnating equipment. It is also suitable for dipping or flooding under vacuum and vacuum/pressure discontinue impregnation of windings especially from small diameters enamelled wires, where impregnating resin with low viscosity and good penetration is required, e.g. transformers.
CHARACTERISTICS
Impregnant Impregnating resin NK 50/1K-30 is a solution of unsaturated polyesterimid in styrene. Curing time is 2 hours at the temperature 140 °C after the winding has reached this temperature. Elasticity of varnish film after curing is very high, so as bonding strength of winding at elevated temperatures. It is resistant to vapour solvents, transformer oils and refrigerator liquids.
Tab. 1 Processing data and properties of liquid resin
| Flow time (DIN Cup 4) at 23 °C | [s] | 25 - 35 |
| Density (DIN 53 217) at 20 °C | [kg/m3] | 1017 - 1020 |
| Shelf- life max. 23 °C | [months] | min. 6 |
| Flash point (Cleveland) | [°C] | 32 |
| Gel-time at 100 °C | [min] | 15 - 30 |
|
Pot life of impregnating resin with hardener by 10 % throughput of tank volume per week max. 23 °C |
Unlimited | |
| Effect of resin on enamelled wires | OK |
Tab. 2 Properties after cure
PACKING AND STORAGE
Impregnating resin is delivered in drums. It have to be stored in tightly closed drums at temperature max. +23 °C.
