High visibility workwear

EN ISO 11612: Protection against heat and flames

Safety clothing with the EN ISO 11612 standard protects workers (except welders and firefighters) who are exposed to heat, flames and molten metals.

EN ISO 11612 is a standard that uses various tests to determine the extent to which clothing is capable of enduring industrial heat. Testing is carried out on the cloth and clothing. The results of these tests are represented by the letters A, B, C, D, E and F in combination with a number indicating the degree of protection. In addition to the tests, the clothing must also meet specific design requirements such as flaps on all cases with the letters D and or E, properly constructed seams and sufficient overlap of a jacket with respect to a pair of trousers.

If the clothing has been tested and meets all the specific design requirements, it will receive a classification. This consists of one or more letters in combination with the corresponding protection level, expressed in a number. If a certain type of protection is not achieved, this will be indicated with a number 0 or the late letter.

The following types of protection, their letter code and possible number codes are possible in EN ISO 11612:


During this test the fabric and seams are flamed for 10 seconds. In the result, the after-lamp time, afterglow time and hole formation must remain within the values ​​of the set standard. The test can be carried out in two different ways:

  • Procedure A (delivers A1) This is the surface flames.
  • Procedure B (delivers A2) This is the edge ignition.
High visibility workwear


What is the heat conduction when exposed to flames? In this test, the substance is kept above the flame, the temperature rise is measured at the top by means of a calorimeter. It measures how much time (s) is needed to reach a temperature rise of 24 ° C. Depending on this, the class is determined:

  • B1: from 4 to 10 seconds
  • B2: from 10 to 20 seconds
  • B3: 20 seconds and more


In this test the substance is exposed to radiant heat by means of infrared. Via a calorimeter the temperature rise is measured on the other side of the fabric. It measures how much time (s) is needed to reach a temperature rise of 24 ° C. Depending on this, the class is determined:

  • C1: from 7 to 20 seconds
  • C2: from 20 to 50 seconds
  • C3: from 50 to 95 seconds
  • C4: 95 seconds and more


In this test the protection is measured against splashes of molten metal. A membrane (which simulates human skin) is applied to the back of the fabric. Next, a certain amount of molten aluminum (Code D) and molten iron (Code E) is applied. The membrane that is on the back of the fabric may not deform.

  • D1: between 100 and 200 grams
  • D2: between 200 and 350 grams
  • D3: 350 grams and more
  • E1: between 60 and 120 grams
  • E2: between 120 and 200 grams
  • E3: 200 grams and more
Multinorm workwear


In this test the protection is measured against possible contact via the clothing with a warm object. During the test, the substance is brought into contact with a test object with a temperature of 250 ° C and the time is measured at which the heat goes down to the back of the fabric. The measured threshold time determines the achieved class as follows:

  • F1: between 5.0 and less than 10.0 minutes
  • F2: between 10.0 and less than 15.0 minutes
  • F3: 15.0 minutes and more



The EN ISO 11612 standard is the basis for safe working. Tricorp advises the user to read the instructions for use and maintenance before the clothes are put into use. If in doubt about the use of protective clothing or questions about the correct use, it is advisable to consult a safety expert and / or manager.


In the table below the Tricorp Multinorm Clothing is classified.

Tricorp Multinorm collection                       Classification
T-shirts and Polo’s                                            A1, B1 and C1
Sweater and fleece                                            A1, B1 and C2
Parka                                                                 A1, B1, C1, E3 and F1
Softshell                                                            A1, B1 and C2
Overall and pants                                              A1, B1, C1, E2 and F1

Get to work safely

Shop workwear with the EN ISO 11612 norm directly

Multi-Standard Softshell Bicolor

Multi-Standard Softshell Bicolor

€185,21 excl. VAT


Multi-Standard Work Trousers

Multi-Standard Work Trousers

€83,01 excl. VAT


Multi-Standard Fleece Jacket Bicolor

Multi-Standard Fleece Jacket Bicolor

€114,96 excl. VAT


Multi-Standard Jacket

Multi-Standard Jacket

€125,76 excl. VAT


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