This standard specifies a general test method for evaluating the flammability of rubber and plastic hoses with a nominal internal diameter of 50 mm and below under laboratory conditions, used to assess their flame-retardant properties. The method involves exposing hose samples to an open flame (such as a specific alcohol lamp flame) and observing their combustion behavior (such as flame spread, after-flame or afterglow time, etc.) in vertical or horizontal positions to determine their flammability rating. It should be noted that this method is not applicable to hoses intended for petroleum fuel in internal combustion engines, as such hoses have separate dedicated test standards. Conducting this test typically requires a flammability tester or a specialized apparatus capable of securing the sample, applying the specified flame, and providing precise timing functions.