Trieda IIB je vhodná do prostredia, kde sa vyskytujú výbušné zmesi plynov IIB a vzduchu.
| Klasifikácia plynu/teplotná skupina | T1 | T2 | T3 | T4 | T5 | T6 |
|---|---|---|---|---|---|---|
| IIA | Formaldehyd, toluén, metylester, acetylén, propán, acetón, kyselina akrylová, benzén, styrén, oxid uhoľnatý, etylacetát, kyselina octová, chlórbenzén, metylacetát, chlór | Metanol, etanol, etylbenzén, propanol, propylén, butanol, butylacetát, amylacetát, cyklopentán | Pentán, pentanol, hexán, etanol, heptán, oktán, cyklohexanol, terpentín, ťažký benzín, ropa (vrátane benzínu), vykurovací olej, pentanol tetrachlorid | Acetaldehyd, trimetylamín | Etylnitrit | |
| IIB | Ester propylénu, dimetyléter | Butadién, epoxidový propán, etylén | Dimetyléter, akroleín, karbid vodíka | |||
| IIC | Vodík, vodný plyn | Acetylén | Disulfid uhlíka | Etylnitrát |
Explosion-proof classifications are split into primary levels for mining and secondary levels for factories. Within the secondary level, sub-classifications include IIA, IIB, and IIC, in ascending order of explosion-proof capability: IIA < IIB < IIC.
The ‘T’ category denotes temperature groups. A ‘T’ rating implies that the equipment maintains a surface temperature below 135°C, with T6 being the optimal safety level, advocating for as low a surface temperature as possible.
Ultimately, this explosion-proof product is designed as an intrinsically safe electrical device, intended for use with Class B gases where the surface temperature does not exceed 135°C.
