Třída IIB je vhodná pro prostředí, kde se vyskytují výbušné směsi plynů IIB a vzduchu.
| Klasifikace plynu/teplotní skupina | T1 | T2 | T3 | T4 | T5 | T6 |
|---|---|---|---|---|---|---|
| IIA | Formaldehyd, toluen, metylester, acetylen, propan, aceton, kyselina akrylová, benzen, styren, oxid uhelnatý, ethylacetát, kyselina octová, chlorbenzen, methylacetát, chlor. | Metanol, etanol, ethylbenzen, propanol, propylen, butanol, butylacetát, amylacetát, cyklopentan. | Pentan, pentanol, hexan, etanol, heptan, oktan, cyklohexanol, terpentýn, nafta, ropa (včetně benzínu), topný olej, tetrachlormethanol. | Acetaldehyd, trimethylamin | Ethylnitrit | |
| IIB | Ester propylénu, dimethylether | Butadien, epoxidový propan, ethylen | Dimethylether, akrolein, karbid vodíku | |||
| IIC | Vodík, vodní plyn | Acetylen | Disulfid uhlíku | Ethylnitrát |
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.
