Interlaboratory Evaluation of the Cyclone Settled Density Test for Cellulosic Loose Fill Insulation. Final Report.
Interlaboratory Evaluation of the Cyclone Settled
Density Test for Cellulosic Loose Fill Insulation.
Lawson, J. R.
NBSIR 79-1930; 18 p. December 1979.
Sponsor:Consumer Product Safety Commission
Order number: PB80-138175
thermal insulation; cyclones; interlaboratory evaluation
The cyclone settled density test for cellulosic loose
fill insulation was evaluated in an interlaboratory test
program. Seven laboratories tested seven cellulosic
loose fill insulations manufactured for the home
insulation market. The participating laboratories were
surveyed to evaluate the test apparatus and test
methodology used at each location. It was concluded that
none of the apparatus used in the program completely met
the prescribed dimensional requirements for the test.
However, statistical analysis of the test results showed
that the repeatability coefficient of variation ranged
from 2.3 to 3.7 percent with a median of 2.9 percent,
and the reproduciblity coefficient of variation ranged
from 4.4 to 9.9 percent with a median of 8.4 percent.
The median difference in density for the materials was
28 percent when blown density was compared to settled
density. This study indicated that there is reasonable
assurance that test results on the same material
obtained at one laboratory can be reproduced in one of
the other laboratories.