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Development of a Testing Protocol for Effects on Strength of Laboratory-Manufactured, Fire Retardant-Treated Strandboard

H. M. Barnes, J. E. Winandy, Joseph M. Hill


This research investigated the mechanical properties of laboratory-manufactured, fire retardanttreated
(FRT) strandboard in an effort to establish laboratory testing protocols for these types of composite
products. This study evaluates both the initial effects of fire retardant treatment and the effects of
extended high-temperature exposure. Two sets of FRT and untreated strandboard panels were manufactured
and tested. Preliminary work had assessed the effect of strandboard specimen width on the
stability of mean and variance estimates obtained when testing matched treated and untreated specimens
with four different widths. Those results indicated that use of ³200-mm-wide strandboard specimens
decreased both variation and error associated in mean estimates compared with testing narrower-width
strandboard specimens. The findings in this study show that the testing protocols developed for laboratorymanufactured,
FRT strandboard were both reproducible and adequately severe. These laboratory test
methods successfully identified the potential initial strength effects on strandboard performance and their
potential for secondary strength loss when exposed for an extended time in a high-temperature environment
minimizing the costs of using large commercial production facilities.


Composites, strandboard, fire-retardant, treatment, strength effects, test protocol

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