A flame is applied to a vertically oriented textile fabric to determine the fire behavior.
A test specimen is oriented vertically on a specimen holder. A small flame is applied to the face of the specimen.
For type B the ease of ignition is observed, and if the flame reaches one of the edges of the specimen and if any flaming debris falls down.
For type C after-flame time and afterglow time have to be measured also.
The test material is judged by the observed characteristics.
The fabric has to be tested before and after laundering: type B (12 wash cycles at 40°c) type C (50 wash cycles at 40°c)