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 < HAZARDOUS INFORMATION < Temperature class |
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The maximum surface temperature of the exposed surface of electrical apparatus must always be lower than the ignition temperature of the gas or vapor mixture |
| Temperature class |
Maximum surface temperature |
Ignition temperature of combustible material |
T1 |
450℃ |
＞450℃ |
T2 |
300℃ |
＞300℃ |
T3 |
200℃ |
＞200℃ |
| T4 |
135℃ |
＞135℃ |
| T5 |
100℃ |
＞100℃ |
| T6 |
85℃ |
＞85℃ |
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| Medium |
Ignition temperature ℃ |
Temperature class |
Explosion group |
Acetaldehyde |
140 |
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T4 |
|
|
IIA |
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Acetic acid |
485 |
T1 |
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|
IIA |
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Acetic anhydride |
330 |
|
T2 |
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IIA |
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| Acetone |
540 |
T1 |
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|
IIA |
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| Acetylene |
305 |
|
T2 |
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IIC |
| Ammonia |
630 |
T1 |
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IIA |
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| Amylacetate |
380 |
|
T2 |
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|
IIA |
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| Benzene |
220 |
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T3 |
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|
IIA |
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| Benzol |
555 |
T1 |
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IIA |
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| Carbon disulphide |
95 |
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T6 |
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IIC |
| Carbon monoxide |
605 |
T1 |
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IIA |
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| Cyclohexene |
430 |
|
T2 |
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IIA |
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| 1,2 - Dichloretane |
440 |
|
T2 |
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IIA |
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| Diesel fuel |
220 up to 300 |
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T3 |
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IIA |
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| Ethane |
515 |
T1 |
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IIA |
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| Ethylacetate |
460 |
T1 |
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IIA |
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| Ethyalcohol |
425 |
|
T2 |
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IIA |
IIB |
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| Ethychloride |
510 |
T1 |
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IIA |
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| Ethylene |
425 |
|
T2 |
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IIB |
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| Ethylenoxide |
440 |
|
T2 |
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IIB |
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| Ethyl ether |
180 |
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|
T4 |
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IIB |
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| Ethyl glycol |
235 |
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T3 |
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| Fuel oil |
220 up to 300 |
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T3 |
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IIA |
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| Hydrogen |
560 |
T1 |
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IIC |
| Hydrogen disulfide |
270 |
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T3 |
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IIB |
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| Methane |
595 (650) |
T1 |
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IIA |
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| Methanol |
455 |
T1 |
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IIA |
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| Methyl chloride |
625 |
T1 |
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IIA |
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| n - Butane |
365 |
|
T2 |
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IIA |
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| n - Buthylalcohol |
340 |
|
T2 |
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IIA |
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| n - Hexane |
240 |
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T3 |
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IIA |
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| n - Propylalcohol |
405 |
|
T2 |
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| Naphtalene |
520 |
T1 |
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IIA |
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| Oleic acid |
360 |
|
T2 |
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| Phenol |
595 |
T1 |
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IIA |
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| Propane |
480 |
T1 |
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IIA |
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| Tetraline |
425 |
|
T2 |
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| Toluole |
535 |
T1 |
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IIA |
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