BS EN ISO 11612 Standard | Arc Flash & Protective Clothing Standards

Published 09 Sep 2021

Arc Flash & Protective Clothing Standards

BS EN ISO 11612 Standard Arc Flash & Protective Clothing Standards

BS EN ISO 11612

Arc Flash & Protective Clothing Standards

BS EN ISO 11612 standard covers the minimum performance requirements of protective clothing to protect against heat and flame. ProGARM® produces garments to protect wearers against heat & flame in accordance with BS EN ISO 11612 standard. This standard replaces the withdrawn EN531 standard and shows our continued commitment to offer garments certified to the latest specifications.

ABOUT BS EN ISO 11612

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 The pictogram is the same as the withdrawn EN531 standard.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 Standard and the results of the tests are represented by the pre-fix letters A, B, C, D, E and F. The number after these letters indicate 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%.

View further information about Arc Flash Clothing Standards.

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 permit any part of the lowest boundary of any flame to reach the upper or either vertical edges
  • No specimen shall give hole formation of 5mm or greater in any direction, except for an inter-lining that is used for specific protection other than heat and flame protection.
  • No specimen shall give flaming or molten debris
  • The mean value of after flame time shall be ≤ 2s
  • The mean value of afterglow time shall be ≤ 2s

Code Letter A1 Edge Ignition, ISO15025 B

Procedure B (leads to Class A2), the flame is applied laterally.

  • No specimen shall permit any part of the lowest boundary of any flame to reach the upper or either vertical edges
  • No specimen shall give flaming or molten debris
  • The mean value of after flame time shall be ≤ 2s
  • The mean value of afterglow 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 longer

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.


BS EN ISO 11612 | Standard Overview

Protective Clothing. Clothing to protect against heat and flame. Minimum performance requirements.

This International Standard specifies performance requirements for protective clothing made from flexible 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, 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 or convective or contact heat or to molten metal splashes.

This International Standard is not applicable to protective clothing that is specified by other International Standards.

Standard Status | Current

Published | 2015

➡ Standards | RIS-3279-TOM | IEC 61482-2 | BS EN ISO 11611BS EN 1149-5 |  BS EN 1149-5 |  BS EN ISO 20471 | BS EN 13034 | BS EN 342 | BS EN 14404 | BS EN 343 | HSG47


BS EN ISO 11612:2008

Protective clothing. Clothing to protect against heat and flame.

BS EN 531:1995

Protective clothing for workers exposed to heat.


Clothing & Garments

Protecting Workers Against the Dangers of Arc Flash4

Thorne & Derrick stock and supply the most extensive range of Arc Flash PPE, Clothing & Protective Garments – should you require any further information, sample garments for field test and trial or a quotation please do not hesitate to contact us.

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Electrical Safety Equipment & Cable Accessories for the Maintenance of Low, Medium & High Voltage Power Systems

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