The Single Burning Item, SBI, has recently been developed and adopted by the European Communities as the main test method for the identification of the so called Euroclasses which will be used for the reaction to fire performance of all building products excluding floorings. A major research programme, including SBI and the Room/Corner test, ISO 9705, was performed during 1997-98 in order to evaluate the SBI test for 30 building products. These products have now been tested in the Cone Calorimeter, which is a well-known international standard, ISO 5660, for fire testing giving basic scientific data. The test results are presented in this study. The Cone Calorimeter results show good repeatability for all products. The FIGRA and SMOGRA indices are defined and presented for the Cone Calorimeter and compared with similar indices from the Room/Corner test and from SBI test. Good agreement was found for the FIGRA index with both Room/Corner and SBI. No agreement was found for SMOGRA. The results are also compared with other results from the Room/Corner test, time to flashover, and from the SBI test, peak rate of heat release, time to ignition and smoke production.