Crosslinking in denture base resin is contributed by:
Composition of Heat activated denture base resin
Liquid:

Monomer – MMA
Plasticizer – Dibutyl phthalate
Cross-linking agent – Ethylene glycol dimethacrylate
Inhibitor – Hydroquinone (0.006%).
Glycol dimethacrylate
Benzoyl peroxide
N-Para toluidine
Methyl methacrylate