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(2) Prepare a bath solution that consists of water that has a hardness of not greater than 324 mg (5 grains) of calcium carbonate per 4.5 L (1.0 imperial gallons) in an amount 30 times the weight of the sample and a commercially available detergent in an amount equal to 15% of this weight. Ensure that the temperature of the bath solution is from 35°C to 38°C inclusive (95°F to 100°F).
(4) Rinse the sample three times in water that has a hardness not greater than 324 mg (5 grains) of calcium carbonate per 4.5 L (1.0 imperial gallons) in an amount 30 times the weight of the sample. Ensure that the temperature of the rinse water is 27°C (80°F). Immerse and gently squeeze the sample in the first rinsing bath for 1 minute and in the second and third baths for 2 minutes each.
(6) Lay the sample flat to dry at ambient temperature, namely, from 18°C to 24°C inclusive (65°F to 75°F).
(4) Close the door of the flammability tester. Set the stop watch to zero. Conduct the test in a draft-free room with the flammability tester at room temperature.
