International Standard for Foundry Protective Clothing
The international standard most commonly used around the world for protective clothing for furnace operators is ISO 11612 Protective clothing - Clothing to protect against heat and flame.
This International Standard specifies performance requirements for protective clothing made from materials, which are designed to protect the wearer's body, except the hands, from heat and/or flame. For protection of the wearer's head and feet, the only items of protective clothing falling within the scope of this International Standard are gaiters, leggings, hoods, and overboots. However, concerning hoods, requirements for visors and respiratory equipment are not given.
The performance requirements set out in this International Standard are applicable to protective clothing which could be worn for a wide range of end uses, where there is a need for clothing with limited flame spread properties and where the user can be exposed to radiant, convective, contact heat and/or to molten metal splashes.
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ISO 11612:2015 A1 or A1 + A2, B(x), C(x), D(x), E(x), F(x) |
This Standard defines the minimum requirements for clothing for protection against heat and flames:
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| CODE | TEST METHOD | PROTECTION AGAINST | PERFORMANCE LEVEL | MINIMUM REQUIREMENT |
| A |
ISO 15025 Procedure A ISO 15025 Procedure B |
Limited Flame Spread – Face Ignition Limited Flame Spread – Edge Ignition |
A1 OR (A1 AND A2) | Pass |
| B | ISO 9151 | Convective Heat | B1 to B3 | B1 |
| C | ISO 6942 | Radiant Heat | C1 to C4 | C1 |
| D | ISO 9185 | Molten Aluminium Splash | D1 to D3 | D1 |
| E | ISO 9185 | Molten Iron Splash | E1 to E3 | E1 |
| F | ISO 12127-1 | Contact Heat | F1 to F3 | F1 |
Physical requirements including Tensile Strength, Tear Strength, and Seam strength must also be tested independently.
CODE A. Flame propagation (ISO 15025 method A)
Sample is exposed to flame for 10 seconds then removed
| Performance level | X | A1 | A2 |
|
Average value of flame persistence < 2 s Average value of residal incandescence < 2 s |
Test not passed |
Test PASSED |
Test PASSED |
CODE B. Convective heat (ISO 9151)
Temperature increase behind sample is measured
| Performance level | B1 | B2 | B3 | |
| Heat Transmission Index - HTI (seconds) | Min | 4 | 10 | 20 |
| Max | <10 | <20 |
HTI = Average of HTI12 and HTI2
HTI12 = Time to increase temperature by 12℃
HTI24 = Time to increase temperature by 24℃
CODE C. Radiant heat (ISO 6942 method B)
Temperature increase behind sample is measured
| Performance level | C1 | C2 | C3 | C4 | |
| Heat transfer t24 (seconds) | Min | 7 | 20 | 50 | 95 |
| Max | <20 | <50 | <95 |
T24 = Time to increase temperature by 24℃
CODE D. Splashes of molten aluminum (ISO 9185)
Quantity necessary to damage PVC film is measured
| Performance level | D1 | D2 | D3 | |
| Molten metal weight (grams) | Min | 100 | 200 | 350 |
| Max | <200 | <350 |
Molten Aluminum at 780℃ (+/- 20℃) (1436℉) PVC film simulates human skin
CODE E. Splashes of molten cast-iron (ISO 9185)
Quantity necessary to damage PVC film is measured
| Performance level | E1 | E2 | E3 | |
| Molten metal weight (grams) | Min | 60 | 120 | 200 |
| Max | <120 | <200 |
Molten Cast-Iron at 1400℃ (+/- 20℃) (2552℉)PVC film simulates human skin
CODE F. Contact heat (ISO 12127)
Heat transmission is measured
| Performance level | F1 | F2 | F3 | |
| Threshold time (seconds) | Min | 5 | 10 | 15 |
| Max | <10 | <15 |
Threshold time = time necessary to increase temperature by 10℃