C4 is a plastic explosive made mostly of RDX , with smaller amounts of plasticizer, binder, and oil to make it moldable and stable. A commonly cited formulation is about 91% RDX, 5.3% plasticizer, 2.1% polyisobutylene, and 1.6% mineral oil.

What that means

  • RDX is the main explosive ingredient.
  • Plasticizer helps keep it soft and shapeable.
  • Binder holds the mixture together.
  • Oil helps with processing and consistency.

Quick note

Because C4 is a controlled explosive, it should only be handled by trained professionals and according to local laws and safety rules.