Answer to Question 1
The two classes of high explosives are primary and secondary explosives. Primary explosives are ultrasensitive to heat, shock, or friction, and under normal conditions detonate violently instead of burning. Secondary explosives are relatively insensitive to heat, shock, or friction, and normally burn rather than detonate when ignited in small quantities in open air. Secondary explosives are usually detonated by primary explosives.
Answer to Question 2
The only ingredients required for a low explosive are fuel and a good oxidizing agent.
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