Part 1 Flammable limits: flammable limits of gases flammable limits of dusts and mists estimation of flammable limits flammable limits of mixtures. Part 2 Flash points: flash points of liquids calculation of flash points. Part 3 Ignition energy: minimum ignition energy ignition energy of gases ignition energy of dusts estimation of ignition energy. Part 4 Auto-ignition temperature: auto-ignition temperature of gases auto-ignition temperature of dusts estimation of auto-ignition temperature. Other factors. Part 5 Sources of energy for ignition: mechanical sources - friction, missiles, metal fracture electrical sources - electrical current, electrostatics, lightning, stray currents, radio frequency thermal sources - hot surfaces, self-heating, flames, compression, engines, diffusion chemical sources - peroxides, polymerization, spontaneous combustion, reactions with other substances, thermite reaction, unstable substances, decomposition. Appendix: fire and related properties of chemicals substances liable to self-heating organic peroxides spontaneously flammable substances unstable substances flammability characteristics of dusts sources of ignition checklist.