Appendix B (normative) Thermal prot

Appendix B (normative) Thermal protection of combustible materialsB.1 IntroductionThis Appendix sets out requirements for materials to provide thermal protection of combustible materials (combustibles) used in gas installations and thereby prevent the combustibles reaching unsafe temperatures.In certain applications the protective materials may also be required to support a load. This Appendix specifies the mechanical material properties. Protection of combustible materials.In gas installations, combustible materials require thermal protection when clearances from heat sources are insufficient and as otherwise stipulated in this Standard.Clause B.3 sets out specifications for materials to provide thermal protection of combustibles.B.2 Specification for materials to provide thermal protection of combustiblesMaterials for the thermal protection of combustibles shall have properties (a) or (b) and, in addition, properties (c), (d) and (e).(a) When tested to AS 1530.1, be deemed not combustible.(b) When tested to AS/NZS 1530.3, have indices as follows:(i) Ignitability — zero (0)(ii) Spread of flame — zero (0)(iii) Heat evolved — zero (0)(iv) Smoke developed — zero to one (0 to 1)Minimum thicknesses and resulting coefficients of heat transfer as follows: