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Ah, OK, go it. The second page of the Celotex datasheet refers to a mock cladding system test, incorporating the RS5000, and the figures of Pass for 6, and Class 1 for 7 was for that system as a whole. However, it would seem somewhat misleading for them to state it has Class 0 rating on the more basic BS 476 standard, without making its actual performance in a system is significantly lower, although still a pass.