GB/T 2406.3-2022Plastics - Determination of burning behaviour by oxygen index - Part 3: Elevated-temperature test (English PDF)

1 Scope

This document describes the temperature range of 25°C to 150°C (typically 40°C to 150°C) under specified test conditions.

Test method for the minimum oxygen concentration required to maintain combustion of small upright specimens in a mixed flow of oxygen and nitrogen. The result is defined as the test temperature

The temperature index of the test temperature is a typical temperature that the plastic material may be in under the actual overheating condition.

This document is applicable to strip or sheet materials whose sample thickness is less than 10.5mm at the test temperature and can stand upright and self-supporting, but not for

Type V specimens that require a support frame in Table 2 of ISO 4589-2.2017.

This document applies to solid materials, laminated materials or foam materials with an apparent density greater than 100kg/m3, as well as some

Foam material at 100kg/m3.This document also provides vertical support methods for flexible sheets or films.

This document also describes the determination of the flammability temperature (FT) of small upright specimens under specified test conditions when the volume fraction of oxygen is 20.9%.

The method (see Appendix A) is limited to tests below 400°C, and is not applicable to materials with an oxygen index less than 20.9%.

Note 1.This document may not apply to materials that show strong shrinkage after heating, such as highly oriented films.

Note 2.Pay attention to the description in ISO 3582 about evaluating the flame propagation characteristics of foam materials with a density less than 100kg/m3.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references

For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

ISO 4589-1 Determination of combustion behavior of plastics by oxygen index method - Part 1.General principles (Plastics-Determinationofburn-

Note. GB/T 2406.1-2008 Determination of Combustion Behavior of Plastics by Oxygen Index Method Part 1.Guidelines (ISO 4589-1.1996, IDT)

ISO 4589-2.2017 Determination of combustion behavior of plastics by oxygen index method - Part 2.Room temperature test (Plastics-

Note. GB/T 2406.2-2009 Determination of combustion behavior of plastics by oxygen index method Part 2.Room temperature test (ISO 4589-2.1996, IDT)

ISO 13943.2008 Fire safety terminology (Firesafety-Vocabulary)

3 Terms and Definitions

The following terms and definitions apply to this document as defined in ISO 4589-1 and ISO 13943.2008.