The results were analyzed according to ISO 5725 [2], which is
the international standard for roundrobins. This standard has been through some
major revisions in the last cycle, and because of the plethora of fire tests run
under the previous (1986) edition, this was used for all of the analysis,
instead of the new (1994) edition. A brief explanation of the results obtained
is as follows.
Test method
Cone Calorimeter: ASTM E 1354, also published by ISO as ISO
5660, parts 1 and 2.
SBI: this is the 'Single Burning Item' test mandated by the
European Commission; a standard describing its details is expected to be published shortly.
ICAL: ASTM E 1623.
Room/Corner test: This was run in a similar, but not identical way, to that prescribed in ISO 9705.
Labs
The number of labs participating.
Levels
In ISO terminology, this denotes the number of different test
conditions explored. The number of levels is identical to the number of
materials tested, unless some materials are tested in more than one way (for
example, at two different heat fluxes).
Peak HRR
The peak HRR (kW m^{2}) reported from the test, using
the standard protocol for the particular test method.
Total HR
The total heat release (MJ m^{2}) reported from the
test, using the standard protocol for the particular test method.
r (%)
The repeatability of the measurement, expressed as a 95%
confidence interval. Numerically this is equal to 2.8 times the repeatability
standard deviation. Note that in the 1994 version of ISO 5725, r is now
to be reported as the repeatability standard deviation, without multiplying by
2.8. This is the only major difference between the 1994 and the 1986 versions of
the ISO 5725 standard, thus if it were desired to obtain expressions for
r in the new way, this could (approximately) be done by dividing all
r values by 2.8.
R(%)
The reproducibility of the measurement, expressed as a 95%
confidence interval. Numerically this is equal to 2.8 times the reproducibility
standard deviation. Note that in the 1994 version of ISO 5725, R is now
to be reported as the reproducibility standard deviation, without multiplying by
2.8. This is the only major difference between the 1994 and the 1986 versions of
the ISO 5725 standard, thus if it were desired to obtain expressions for
R in the new way, this could (approximately) be done by dividing all
R values by 2.8.
