High quality supplier of organosilicon and new polymer chemical materials
High quality supplier of organosilicon and new polymer chemical materials
JY-261 is a polydimethyl silicone liquid that meets the requirements of transformer. With electrical insulation properties over a wide temperature range, combined with high thermal stability, JY-261 transformer liquid is suitable for transformers and other electrical equipment designed to operate at high temperatures or at low temperatures.
1. Features
Meets the requirements of both IEC836 and ASTM D4652-92
Compatible with solid electrical insulating materials
Environmentally friendly
High thermal stability and oxidation resistance
Higher fire point and lower heat release rate than other types of class K insulating liquids
Good electrical properties and operating capabilities over a wide temperature range
Non-sludging
2. Applications
Cooling and insulating liquid for transformers and other electrical equipment.
SAME AS DOW CORNING 561
3. Typical Properties
Technical index | unit | value | |
Tested to ASTM 4652-92 | |||
Appearance |
| Crystal clear liquid | |
Density at 25°C (77°F) | Kg/dm3 | 0.96 | |
Viscosity at 25°C (77°F) | mm2/s | 20-50 | |
Water content | ppm | 30 | |
Specific heat | Kj/kg.K | 1.51 | |
Thermal conductivity | W/(m.K) | 0.151 | |
Refractive index at 25°C (77°F) |
| 1.404 | |
Breakdown voltage1 | Kv | 50 | |
Permittivity at 25°C (77°F)-50Hz |
| 2.7 | |
Dissipation factor at 25°C (77°F)-50Hz |
| 0.0001 | |
Volume resistivity at 25°C (77°F) | Ohm.cm | 1.0x1014 | |
Flash point open cup | °C | ＞300 | |
Fire point-open cup | °C | 370 | |
4. Usable life and storage
This product should be stored in airtight containers to protect it from moisture and contamination.
When stored at or below 60°C(140°)in the original unopened containers, this product has a usable life of 36 months from the date of production.
Technical index | Test Method | Permissible Values | Our JY-261 |
Physical |
|
|
|
Color | 8 | Max 35 |
|
Appearance | 9 | Clear, free from suspended matter and sediment |
|
Density at 20℃(68℉) (kg/ dm3) | 9 | 0.995 to 0.970 |
|
Kinematic viscosity at 40℃(104℉)( mm2/s) | 10 | 40±4 |
|
Flash Point（℃/℉）（closed cup） | 11 | Min 240/464 | 260/500 |
Fire point (℃/℉）（open cup） | 12 | Min 330/626 | 370/698 |
Refractive index at 20℃(68℉) | 13 | 1.404±0.002 |
|
Pour point (°C /°F) | 15 | Max -50/-58 |
|
Chemical |
|
|
|
Water content ( mg/kg) | 16 | Max 50 | 30 |
Neutralisation value (mg KOH/g) | 17 | Max 0.02 | 0.008 |
Electrical |
|
|
|
Breakdown voltage( Kv) | 19 | Min 401 | 50 |
Dielectric dissipation factor(tg)at 90℃(194℉)and 50Hz | 20 | Max 0.0011 | 0.0005 |
Permittivity at 90℃(194℉) | 20 | 2.55±0.052 |
|
d.c.resistivity at 90℃(194℉) (G ohm.m) | 20 | Min 100 | 1000 |
lynnejiang@china-juyou.com
