- British Standard – BS 476: part 4:1970
- American standard – ASTM E119 (2 hr)
- Australia and New Zealand – Grade 1 (AS 3837 CSIRO, AS 1530.1 – 1994, AS ISO 9239.1-2003 (BSEN 13238-2001) Exova Warringtonfire)
- China standard – Class A1 non-combustible (GB 8624-2006)
- Green product – Green Label and Green Building Council Materials