# Commission Delegated Regulation (EU) 2016/364 of 1 July 2015 on the classification of the reaction to fire performance of construction products pursuant to Regulation (EU) No 305/2011 of the European Parliament and of the Council (Text with EEA relevance), Division 1.3: For the purposes of Table 4 the following symbols and test parameters apply:

Extent: E+W+S+N.I.

(1) ‘HRRsm30, kW’ heat release rate averaged by a 30-s sliding average;
(2) ‘SPRsm60, m2/s’ smoke production rate averaged by a 60-s sliding average;
(3) ‘Peak HRR, kW’ maximum of HRRsm30 between test start and end of test, excluded contribution from ignition source;
(4) ‘Peak SPR, m2/s’ maximum of SPRsm60 between test start and end of test;
(5) ‘THR1200, MJ’ total heat release (HRRsm30) from test start until end of test, excluded contribution from ignition source;
(6) ‘TSP1200, m2’ total smoke production (HRRsm60) from test start until end of test;
(7) ‘FIGRA, W/s’ fire growth rate index defined as the highest value of the quotient between HRRsm30 excluding the contribution of ignition source and time. Threshold values HRRsm30 = 3 kW and THR = 0,4 MJ;
(8) ‘FS’ flame spread (damaged length);
(9) ‘H’ flame spread.

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Source: https://www.legislation.gov.uk/eur/2016/364/annex/division/1.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2016-364/annex/division-1.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.