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EN ISO 11612 Clothing to Protect against Heat & Flame

EN ISO 11612 Standard that will protect you from heat and flame.

Stay protected against Electrical ARC by wearing the Fire Bear !

ARC Standards

EN ISO11612 Clothing to Protect against Heat & Flame

EN ISO 11612 Arc Flash Clothing

About this EN Norm

The requirements apply to clothing intended for a wide range of application which offer limited flame spread and provide protection against various hazards including Radiant Heat, Convective Heat and splatters of Molten Metal. The pictogram is the same as the withdrawn EN531 standard. There are several fabric tests within this EN Norma and the results of the tests are represented by the pre-fix letters A, B, C, D, E and F. A number after these letters indicates the performance of the fabric within this test. If a (0) is shown, then the fabric has not been tested or does not achieve the lowest value attainable with the test.


Fabric Requirements

General Requirement : The mechanical strength and heat resistance at a temperature of 180°C: the material shall not ignite or melt and shall not shrink by more than 5%.

Explaining the different Tests and Codes

Letter A (EN 15025)

This test consists of applying a flame to a fabric sample for 10 seconds. To pass the test, the after flame & smoulder times and formation of holes must be within the tolerances within the standard. The application of a flame can take place in two ways:

Code Letter A1 Surface Ignition, ISO15025 A

Procedure A (leads to Class A1), the flame is applied horizontally (similarly to EN470 and EN531)

• No specimen shall give flaming to the top or either side edge

• No specimen shall give hole formation

• No specimen shall give flaming or molten debris

• The mean value of after flame time
shall be ≤ 2s

• The mean value of afterglove time
shall be ≤ 2s

Letter B (ISO 9151)

Convective Heat: determination of the heat transmission when exposed to flames. The sample is held above the flame and the rise in temperature on the topside of the sample is measured with a calorimeter. The length of time the sample can remain exposed before its temperature rises by 24 °C is determined.

B1: 4 < 10 seconds, B2: 10 < 20 seconds, B3: 21 seconds and longer

Letter C (ISO 6942)

Exposure to Radiant Heat. In this test, a fabric sample is exposed to radiant heat (infrared rays). The temperature on the reverse (unexposed) side of the sample is registered using a calorimeter. Subsequently, the length of time the sample the sample can remain exposed

before its temperature rises by 24°C is measured. The test procedure is the same as ISO 11611, but the classification is different:

C1: 7 < 20 seconds, C2: 20 < 50 seconds, C3: 50

< 95 seconds, C4: 95 seconds and longe

Letter D and E (ISO 9185)

D = Aluminium

E = Molten Iron

Determining the level of protection against spatters of molten metal. A membrane (with similar properties to human skin) is attached to the reverse of the fabric sample sequentially rising quantities of molten metal (Aluminium or Iron as applicable) are splashed on the sample. The quantity of molten metal which deforms the membrane is determined.

The classification for molten aluminium is:

D1: 100 < 200 grams, D2: 200 <350 grams, D3: 350 grams and more

The classification for molten iron is:

E1: 60 < 120 grams, E2: 120 < 200 grams, E3: 200 grams and more

Letter F (ISO 12127)

This is a new test to establish a value for contact heat. The classification in this respect:

F1:  5 < 10 seconds, F2: 10 < 15 seconds, F3: 15 seconds and longer

Letter W

This is an optional test for protection against rain. The first "n" refers to the waterproofing class, the second "n" to the water vapour permeability class. Please also refer to EN343 for further information.


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