The EN 11612 standard is to lay norms for the protection against heat, flames, and molten metals.
EN ISO 11612 is a protective workwear standard that uses various norms to measure the extent to which clothing is capable of enduring industrial heat. The clothing is put under test by reputed laboratory specialized in industrial clothing tests. 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.
Letters in the EN11612
11612-A FLAME SPREADING
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.
11612-B CONVECTIVE HEAT
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
11612-C RADIANT HEAT
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
11612D / E MOLTEN METAL
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
11612-F CONTACT HEAT
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