ÖNORM EN ISO 4589-1

1 .1 This part of IS0 4589 constitutes a guidance document for the 01 test. It provides information to guide the reader in the use of the test procedures described in parts 2 and 3. 1.2 Part 2 describes a method for determining the minimum concentration of oxygen by percentage volume in a mixture of oxygen and nitrogen introduced at 236 + 2 C that will just support combustion of a material under specified test conditions. The results are defined as 01 values. For comparative purposes, a procedure is also provided for determining whether or not the 01 of a material lies above some specified minimum value, which is particularly important for quality control purposes. There is also a procedure for the testing of thin films between 20 pm and 100 pm thickness. 1.3 Part 3 describes methods of carrying out the same determination over a range of temperatures typically between 25 C and 150 C (although temperatures up to 400 C may be used). The results are defined as 01 values at the test temperature. Part 3 also describes a method for determining the temperature at which the 01 of the small vertical test specimens is 20,9. The result is defined as the flammability temperature. Part 3 is not applicable to materials having an 01 value of less than 20,9 at 23 C.