GB/T 2406.1-2008: Plastics -- Determination of burning behaviour by oxygen index -- Part 1: Guidance

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Scope

1.1 This Part of GB/T 2406 constitutes a guidance document for the OI test. It provides
information to guide the reader in the use of the test procedures described in Parts 2 and
3.
1.2 ISO 4589-2 describes a method for determining the minimum concentration of oxygen
by percentage volume in a mixture of oxygen and nitrogen introduced at 23 °C ± 2 °C that
will just support combustion of a material under specified test conditions. The results are
defined as OI values. For comparative purposes, a procedure is also provided for
determining whether or not the OI value 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 µm and 100 µm thickness.
1.3 ISO 4589-3 describes methods of carrying out the same determination over a range of
temperatures typically between 25 °C and 150 °C (up to 400 °C may be used). The results
are defined as OI value at test temperature. ISO 4589-3 also describes a method for
determining the temperature at which the OI of the small vertical test specimens is 20.9.
The result is defined as the flammability temperature. ISO 4589-3 is not applicable to
materials having an OI value of less than 20.9 at 23 °C.

Basic Data

Standard ID	GB/T 2406.1-2008 (GB/T2406.1-2008)
Description (Translated English)	Plastics -- Determination of burning behaviour by oxygen index -- Part 1: Guidance
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080
Word Count Estimation	8,810
Date of Issue	2008-08-04
Date of Implementation	2009-04-01
Older Standard (superseded by this standard)	GB/T 2406-1993
Quoted Standard	ISO 4589-2-1996; ISO 4589-3-1996
Adopted Standard	ISO 4589-1-1996, IDT
Regulation (derived from)	National Standard Approval Announcement 2008 No.14 (Total No.127)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the ISO 4589-2 and ISO 4589-3 testing process guidance information. ISO 4589-2 is described under specified test conditions, Walter 23��C �� 2��C oxygen, nitrogen gas mixture, the material is just the minimum oxygen concentration in the test methods needed to sustain combustion. The result is defined as OI values. For ease of quality control, but also gives the material and determination of whether the value OI some predetermined thickness 20��m ~ 100��m in value of the film is higher than that between the test. The method described in ISO 4589-3 at 25��C ~ 150��C specific temperature range (up to 400��C) for the above measurement.