AISO 15025
Limited flame spread
Required base protection against ignition and flame spread.
EN ISO 11612
Protective clothing for limited flame spread, convective, radiant and contact heat, and molten-metal splashes.
Six protection codes
BISO 9151
Convective heat
Measures heat transferred through the material during flame exposure.
CISO 6942
Radiant heat
Measures insulation against a defined source of radiant thermal energy.
DISO 9185
Molten aluminium
Evaluates material response to splashes of molten aluminium.
EISO 9185
Molten iron
Evaluates material response to splashes of molten iron.
FISO 12127-1
Contact heat
Measures the time taken for contact heat to pass through the material.
Requirements & test methods
Heat & flame performance
ISO 17493
Exposes materials to hot air for 5 min at 180 °C, with an optional test at 260 °C.
No ignition or melting. Shrinkage ≤ 5% at 180 °C and ≤ 10% at 260 °C.
ISO 15025
Tests surface ignition (A1) and additional lower-edge ignition (A2).
Afterflame ≤ 2 s and afterglow ≤ 2 s. No flaming or molten debris; flame spread, holes and seam integrity are also assessed.
ISO 9151
Measures the time to a 24 °C calorimeter rise at a flame heat flux of 80 kW/m².
Convective heat: code B.
| Code | HTI24 (s) |
|---|---|
| B1 | 4 ≤ HTI24 < 10 |
| B2 | 10 ≤ HTI24 < 20 |
| B3 | HTI24 ≥ 20 |
ISO 6942
Measures the time to a 24 °C calorimeter rise at a radiant heat flux of 20 kW/m².
Radiant heat: code C.
| Code | RHTI24 (s) |
|---|---|
| C1 | 7 ≤ RHTI24 < 20 |
| C2 | 20 ≤ RHTI24 < 50 |
| C3 | 50 ≤ RHTI24 < 95 |
| C4 | RHTI24 ≥ 95 |
ISO 9185
Pours molten aluminum or iron onto the material or assembly and checks damage to the PVC sensor film beneath it.
Molten aluminum: code D. Molten iron: code E.
| Level | Aluminum: code D (g) | Iron: code E (g) |
|---|---|---|
| 1 | 100 ≤ mass < 200 | 60 ≤ mass < 120 |
| 2 | 200 ≤ mass < 350 | 120 ≤ mass < 200 |
| 3 | mass ≥ 350 | mass ≥ 200 |
ISO 12127-1
Measures the time to a 10 °C calorimeter rise in contact with a cylinder at 250 °C.
Contact heat: code F.
| Code | Threshold time (s) |
|---|---|
| F1 | 5 ≤ time < 10 |
| F2 | 10 ≤ time < 15 |
| F3 | time ≥ 15 |
Fabric strength & durability
ISO 5077
Measures length and width change after washing and drying.
Dimensional change within ±3% for woven materials and ±5% for knitted materials.
ISO 13934-1
Measures tensile strength of woven outer materials in both directions using the strip test.
Tensile strength ≥ 300 N.
ISO 13937-2
Measures tear force of woven outer materials in both directions using a trouser-shaped specimen.
Tear force ≥ 10 N.
ISO 13938-1 / ISO 13938-2
Measures bursting pressure of knitted outer materials and structural seams.
Bursting strength ≥ 100 kPa at 50 cm², or ≥ 200 kPa at 7.3 cm².
ISO 13935-2
Measures rupture force of structural seams in woven outer materials.
Seam strength ≥ 225 N.
Where the standard is used
Oil & Gas
Industrial work with assessed flame and heat exposure.
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Electrical
Flame and heat exposure during electrical maintenance.
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Welding
Additional flame and heat exposure around hot-work areas.
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Foundry
Foundry work involving radiant heat or molten-metal splash.
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