1 Scope
This standard specifies two methods for determining the burning of rubber in laboratory environment, namely oxygen index method (Method A) and vertical combustion method (Method B).
This standard is applicable to the evaluation of the burning and flame retardance of rubber materials in laboratory environment, and is not applicable to the evaluation of the ignition risk of rubber materials under actual use conditions.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test pieces for physical test methods (ISO 23529: 2004, IDT)
GB/T 3863 Industrial oxygen
GB/T 3864 Industrial nitrogen
HG/T 3095 Fire tests terms for rubber
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in HG/T 3095 and the following apply.
3.1
oxygen index
minimum oxygen concentration necessary for maintaining the combustion of rubber materials under the specified test conditions and in the oxygen-nitrogen mixture flow at 23℃±2℃, which is expressed by volume fraction
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Method A - Oxygen index method
4.1 Principle
4.2 Test device
4.3 Specimens
4.4 Test procedures
4.5 Result calculation
4.6 Test report
5 Method B - Vertical combustion method
5.1 Principle
5.2 Test device
5.3 Specimens
5.4 Test procedures
5.5 Result calculation
5.6 Result evaluation
5.7 Test report
Annex A (Normative) Calculation of oxygen concentration
Annex B (Informative) Relationship between oxygen concentration and oxygen/nitrogen flow rates
Annex C (Informative) Examples for calculation of test results
Annex D (Informative) Schematic diagram for Bunsen burner with scale benchmarks
