EN ISO 11612: Protection against heat and flame (global standard for EN531)
The EN ISO 11612 standard specifies the performance requirements for protective clothing 
which must protect the user's body (with the exception of the hands) against heat and/or flames. The performance requirements set out in EN ISO 11612 apply to protective clothing that can be worn for a variety of purposes, for example where clothing with limited flame spread is required and where the user may be exposed to radiant, convective or contact heat or splashes of molten metal. The standard does not apply to firefighters (EN 469) and welders (EN ISO 11611). The requirements include: performance after pre-treatment of the fabric, accessories, mechanical properties, dimensional stability etc.
Test results
The standard contains a number of tests regarding the cloth. The results of these tests are represented by the letters A, B, C, D, E and F. If a letter is not mentioned or the class is '0', the lowest value has not been achieved or the test has not been carried out; the clothing then offers no protection against this property.
A: A1 or A2 (surface or edge ignition)
Were tested based on the index 3 test of the EN ISO 15025 standard
B: Convection heat ISO 915
| Performance level | Transfer Convective Heat Index (HTI24) | |
| Min | Max | |
| B1 | 4.0 s | < 10 s |
| B2 | 10.0 s | < 20 s |
| B3 | 20.0 s | |
C: Radiant heat test ISO 6942, heat flux 20 kW/m²
The clothing must achieve at least C1
| Performance level | Transfer radiant heat index (HTI24) | |
| Min | Max | |
| C1 | 7.0 sec | < 20 s |
| C2 | 20.0 s | < 50 s |
| C3 | 50.0 sec | < 95 s |
| C4 | 90.0 s | |
D: Splashes of molten aluminum ISO 9185
The clothing must achieve at least D1
| Performance level | Splashes of molten aluminum | |
| Min | Max | |
| D1 | 100g | < 200g |
| D2 | 200g | <350g |
| D3 | 350g | |
E: Splashes of molten iron ISO 9185
The clothing must achieve at least E1
| Performance level | Splashes of molten iron | |
| Min | Max | |
| E1 | 60g | < 120g |
| E2 | 120g | < 200g |
| E3 | 200g | |
F: Contact heat ISO 12127 - 250 degrees
The clothing must achieve at least F1
| Performance level | Contact heat | |
| Min | Max | |
| F1 | 5.0 s | 10.0 s |
| F2 | 10, s | 15.0 s |
| F3 | > 15.0 s | |