T4
For T4, category is temperature code; maximum surface temperature (c) is 135; basis or note is Ignition temperature of gas / dust >135-200, recorded from its source on 2026-08-06.
- Category
- temperature code our reading
- North American designation
- T4 verified
- IEC / ATEX designation
- T4 verified
- Maximum surface temperature (C)
- 135 verified
- Basis or note
- Ignition temperature of gas / dust >135-200
- Maximum surface temperature (F)
- 275 per ldpi-inc.com
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
135 | T4 | >135-200
— e2s.com, retrieved 2026-08-06
What ldpi-inc.com says
T4 | T4 | 135 | 275
— ldpi-inc.com, retrieved 2026-08-06
What inframena.com says
T4 | 135°C |
— inframena.com, retrieved 2026-08-06
Sources
- e2s.comhttps://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups
- ldpi-inc.comhttps://ldpi-inc.com/resources/classification-codes/class-1-locations/
- inframena.comhttps://www.inframena.com/hazardous-area-classification-equivalency-guide/