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Interlaboratory Evaluation of the ASTM E 84-77A Tunnel Test Modified by the Consumer Product Safety Commission for Cellulosic Loose Fill Insulation. Final Report.


pdf icon Interlaboratory Evaluation of the ASTM E 84-77A Tunnel Test Modified by the Consumer Product Safety Commission for Cellulosic Loose Fill Insulation. Final Report. (2014 K)
Lawson, J. R.

NBSIR 79-1922; 34 p. November 1979.

Sponsor:

Consumer Product Safety Commission, Bethesda, MD
Order number: PB80-128317

Keywords:

thermal insulation; flame spread; test methods; tunnel tests; interlaboratory evaluation

Abstract:

An interlaboratory evaluation was conducted to determine precision estimates for repeatability and reproducibility of the American Society for Testing and Materials (ASTM) E 84-77a tunnel test as modified by the Consumer Product Safety Commission for cellulosic loose fill insulation. Six laboratories participated in this study by running tunnel tests on eight cellulosic loose fill materials. Each laboratory was surveyed during the project to examine its conformance with the critical details of the test apparatus and procedure. The results of the survey showed that none of the tunnels completely conformed with the specifications of the modified ASTM E 84-77a standard. The within-laboratory coefficients of variation for repeatability for the six fire-retardant treated cellulosic insulations ranged from 11 to 23 percent with an average of 16 percent. The between-laboratory coefficients of variation for reproducibility for the same materials ranged from 31 to 41 percent with an average of 35 percent. There would be little assurance that different laboratories would be able to distinguish between insulations which do and which do not comply with the CPSC mandatory level (FSC less than or equal to 25) on a consistent basis.