Test for Flammability of Plastics — Vertical Burning Method
This standard specifies a method for classifying the burning behavior of vertically oriented specimens (of a certain size) exposed to a flame ignition source under specified test conditions. It is only applicable to quality control test and material selection test, and cannot be used as the criterion to evaluate the ignition risk under actual use conditions.
1 Test Specimen
1.1 Specimen size: length: 130 ± 3 mm long; width:13.0 ± 0.3 mm; thickness: 3.0 ± 0.2 mm.
Note: Tests may also be carried out on specimens of thickness from 2 mm to 13 mm, but such test results can only be compared between the same thickness.
1.2 The surface of test specimens shall be flat and free from any bubbles, flying edges, burrs and other defects.
1.3 The number of test specimens in each group is 5.
1.4 Test specimens may be made by pressure molding and injection molding, or machined from sheets, tubes, bars and insulating parts.
2 Conditioning
2.1 Test specimens shall be conditioned for 48 hours in accordance with GB 2918-82 Plastics — Standard Atmospheres for Conditioning and Testing.
2.2 Test specimens can also be conditioned according to the conditions specified by the manufacturer or to the product standards.
