MaTestLab > Test Standards > ASTM D2863 Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)

ASTM D2863 Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)

The ASTM D2863 standard defines a process for determining the minimum oxygen concentration, expressed as a percentage of volume, required to enable flame combustion in a flowing mixture of oxygen and nitrogen. The minimum concentration of oxygen that will just support flaming combustion is expressed as percent volume. ASTM D2863 comprises three test procedures A, B, and C involving top surface ignition, propagating ignition, and the comparison with a specified minimum value of the oxygen index.

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Introduction to ASTM D2863

The ASTM D2863 test method determines the minimal oxygen concentration in a flowing combination of oxygen and nitrogen that will only support the flame combustion of plastics. The relationship between burning characteristics and real use conditions is not implied. ASTM D2863 provides three procedures. Procedure A involves top surface ignition, Procedure B involves propagating ignition, and Procedure C involves comparison with a minimum oxygen index.

ASTM D2863 Standard Test Method

Procedure AThe percentage of oxygen in the mixture that supports sustained burning of a specimen is calculated as the oxygen index. The top surface of the upper end of the specimen is ignited using the igniter, and the flame is applied for up to 30 s.
Procedure BThe igniter is used to produce burning across the top and partially down the vertical faces of the specimen. The percentage of oxygen in the mixture that supports sustained burning of a specimen is calculated as the oxygen index. The top surface of the upper end of the specimen is ignited using the igniter, and the flame is applied for up to 30 s.
Procedure CThe burning behavior of three specimens is assessed, and the oxygen index is recorded if at least two out of three are extinguished.

ASTM D2863 Test Specimen

Specimen detailsTest specimens should be prepared by die-punching, hand-cutting, or injection molding with clean surfaces and recorded in position and orientation.
Specimen dimensionsThe dimensions and geometry of the ASTM D2863 specimens vary depending on the specific requirements. Solid, laminated or cellular materials characterized by an apparent density greater than 15 kg/m3 and structurally self-supporting specimens in the form of vertical bars or sheets up to 10.5-mm thick are used.
Specimen preparationThere are six types of specimens detailed in this method and are prepared per the need. The specimens’ edges should be clean and devoid of fuzz or burrs left over following machining or molding.

ASTM D2863 Test Results

This test method measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions. The oxygen index is calculated as the percentage of oxygen in the mixture that supports the sustained burning of the specimen. Data analysis and reporting are used to calculate the average oxygen index and report the results.

Other Tests Related to ASTM D2863

ASTM D2863 is related to other test methods, including ASTM D618 for conditioning plastics for testing and ASTM D1071 for volumetric measurement of gaseous fuel samples.

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Where can I get the astm d2863 tested?

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