An interlaboratory study, designed consistent with Practice E691, was conducted
in 1989. Eight laboratories participated in this study. Supporting data are
available from ASTM Headquarters. Request Report RR:D05-1015. In addition,
information for coke was calculated per Practice E691 using 48 sets of data for 24
coke samples for a commercially available interlaboratory proficiency test program.
The cokes used in this study included furnace coke, foundry coke and coke breeze.
Details and supporting information are given in RR:D05-1039