NHZ 94
Application
It is designated for trickling impregnation of mechanically and thermally stressed windings of alternators and electrical rotating machines for domestic appliances and hand tools of thermal class H (180°C).
Trickling impregnating resin NHZ 94 is delivered according to TP VUKI 0204/96.
Characteristics
Trickling impregnating resin NHZ 94 is a solution of modified unsaturated polyester resin in dialyphtalate. Before processing it must be mixed with a hardener Z 83 in the mass ratio 100:2. It is characterized by short curing time by 150°C. Windings impregnated with it have very good bonding strength, resistance to vapour solvents, transformer oils and refrigerator liquids and radioactive radiation.
Tab.1 Processing data
| Density (DIN 53 217) | 25 °C | [kg/m3] | 1130 - 1180 |
|
Flow time (DIN Cup 4) |
25 °C 40 °C |
[s] |
110 - 150 40 - 50 |
| Viscosity |
25 °C 40 °C |
[mPa.s] |
600 - 800 150 - 200 |
| Shelf-life | max. 25 °C | [month] | min. 12 |
|
Flash point (PM) |
[°C] | 145 | |
| Pressure of saturated vapours |
25 °C 100 °C |
[mbar] |
0,0013 0,26 |
| Gel time 1) |
100 °C 120 °C 130 °C |
[min] |
8 - 9 3 - 4 2 - 3 |
| Pot life | max. 25 °C | [mesiace] | 2 |
| Reaction time 2), 3) | 120 °C | [min] | 3 - 4 |
| Exothermal temperature 2), 3) | 120 °C | [°C] | 200 - 210 |
| Curing time 4) | 150 °C | [min] | 30 |
| Test of effect of impregnating resin on enameled wires (LCIA, LCDA) 5) | meets | ||
Tab.2 Properties after cure
| Drying to depth 2), 6) | I. 1.1.1.10) 0. 1.1.1. |
|
| Curing of test specimen 150°C | [h] | 1 |
| Electric strength 7) 23 °C after 24 h in water |
[kV/mm] | 120 - 140 100 - 120 |
| Volume resistivity 2) 23 °C 155 °C 180 °C after 7 days in water |
[Ω.m] |
1014 |
| Twisted coil test 8) 23 °C 155 °C 180 °C |
[N] |
300 - 350 |
| Helical coil test 8) 23 °C 155 °C 180 °C |
[N] | 180 - 200 100 - 120 60 - 90 |
| Glass transition temperature (Tg) | [°C] | 145 |
| Thermal endurance 9) Test criterion: Bond strength 22 N (Helical coil) |
[°C] | 188 |
| Thermal endurance 9) Test criterion: Breakdown voltage 700 V (Twisted pairs) |
[°C] | 185 |
1). DIN 16 945 Method A
2). DIN 46 448 Blatt 1
3). Fe-Ko thermocouple according to ASTMD 2471-71
4). Since reaching 150°C in windings
5). STN 67 3150 čl. 11, met. B after 60 min at 70 °C
6). 4h by 100°C + 1,5h by 110°C +2h by 120°C
7). NEMA Standard RE 2 – 1987
8). STN IEC 61033
9). STN IEC 60216
10). Specimen appearance: hard, free of leaks and bubbles, surface smooth, non tacky
Packing and storage
Impregnating resin is delivered in non-returnable, clean, for other products not used drums DG 55 with capacity 216,5l, eventually in packages according to agreement between producer and client.
Impregnating resins are stored in tightly closed packages in dry ventilated warehouse by max.+25°C, which complies with STN 65 0201.
