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normal material

slightly hazardous

hazardous

extreme danger

very unsafe/deadly

not flammable

above 200oF - ignites when preheated

below 200oF - ignites with moderate heating

below 100oF - ignites in normal conditions

below 73oF

stable

unstable if heated

slight chemical damage

detonates with only shock/heat

may detonate under normal conditions

health hazard

flammability

instability

special hazard
what is NFPA
national fire protection association