CORESTA Meeting, Smoke/Technology, Vienna, 1995, ST40
Inter-bolt variability of cotton duck #4 and the effects on cigarette ignition propensity test outcome
American Tobacco Company, Hopewell, VA, USA
The cigarette ignition test method developed by NIST (National Institute of Standards and Technology) relies on cotton duck substrates because of "essentially constant cigarette ignitability in successive batches". Round-robin testing in nine laboratories had provided reproducibility limits of R = 0.39. New samples purchased for developmental work were within manufacturing specifications but ignition results were well outside of R=0.39. An American Standards & Testing Methods (ASTM) ruggedness test that was used to evaluate effects of test variables eliminated all variables as significant except fabric. Examination of fabric characteristics led to conclusion that small sample-to-sample variations in cotton ducks contribute to large differences in cigarette ignitions.