Electrotechnical magnesia
Electrotechnical magnesia is used as electrical insulation filler for tubular electric heaters and other electrical instruments and equipment. (GB 13236-83)
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Description
| Index item | Specification standard | |||
| PPEH-VM | PPEH-VM | PPEH-VM | PPEH-VM | |
| Mass fraction,% | ||||
| MgO,＞ | 97,0 | 96,0 | 95,5 | 95,0 |
| SiO2, ＜ | 1,5 | 2,0 | 2,5 | 2,8 |
| Al2O3, ＜ | 0,8 | 1,0 | 1,5 | 2,0 |
| Quantity of impurities, including: | ||||
| CaO, ＜ | 0,7 | 1,3 | 1,8 | 2,5 |
| Fe2O3, ＜ | 0,08 | 0,12 | 0,20 | 0,34 |
| loss on ignition, %, ＜ | 0,1 | 0,1 | 0,1 | 0,2 |
| Water absorption, %,＜ | ||||
| Magnesium from brucite | 1,3 | 1,5 | 1,5 | 2,5 |
| Magnesium from magnesite | 2,5 | 2,5 | 2,5 | 2,5 |
| Magnetic impurity content, %, ＜ | 0,005 | 0,007 | 0,010 | 0,020 |
| Volume resistivity，Ω*cm, ＞, Temperature | ||||
| 600 оС | 5,0×109 | - | - | - |
| 800 оС | 5,0×108 | 2,3×108 | 8,0×107 | 2,0×107 |
| 1000 оС | 2,2×107 | 1,2×107 | 5,0×106 | 2,0×106 |
| Electric strength, temperature 1000 оС, кV/мм, ＞ | 1,3 | 1,2 | 1,1 | 1,0 |
| Granularity, % | In accordance with the requirements of customers | |||
| Usage | Used as electrical insulation filler for tubular electric heaters and other electrical instruments and equipment | |||
Keywords:
electrotechnical
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