Roj hmab lossis qee cov ntaub ntawv polyolefin tuaj yeem tau txais cov khoom siv kho tshuab, thermal, lossis tshuaj lom neeg los ntawm kev sib txuas sib txuas. Raws li cov polymers sib txawv thiab kev siv, cov tshuaj tiv thaiv no tuaj yeem raug xa mus rau kev kho (tshwj xeeb yog cov khoom siv thermosetting) lossis vulcanization (tshwj xeeb yog cov khoom siv roj hmab thiab cov khoom siv sulfur).
Ntawm cov kev sib txawv crosslinking cov tshuaj tiv thaiv no, cov tshuaj tiv thaiv dawb radical muaj ntau. Feem ntau hais lus, ib kauj ruam ib txwm dhau los ua cov dawb radical. Organic peroxides raws li qhov chaw ntawm cov dawb radicals. Lawv tsim kom muaj zog peroxy radicals los ntawm thermal decomposition, uas tuaj yeem ntes hydrogen atoms ntawm cov pob txha polymer, tshwj xeeb tshaj yog CH2 units uas muaj aliphatic pawg. Tom qab ntawd cov macromolecular dawb radicals undergo branching thiab cross-linking tshua rau recombination. Organic peroxides tuaj yeem siv ib leeg lossis ua ke nrog ntau lub luag haujlwm radical monomer.