BS 4735 Laboratory method of test for Assessment of the horizontal burning characteristics of specimens no larger than 150 mm× 50 mm× 13 mm (nominal) of cellular plastics and cellular rubber materials when subjected to a small flame

BS 4735 Laboratory method of test for Assessment of the horizontal burning characteristics of specimens no larger than 150 mm× 50 mm× 13 mm (nominal) of cellular plastics and cellular rubber materials when subjected to a small flame