All peroxyketal peroxides contain two peroxy groups, which are bonded to the same carbon atom. The oxygen-oxygen bond has a lower thermal stability as compared to dialkyl peroxides so peroxyketals have fewer half-lives. The peroxyketals are non-aromatic, liquid peroxides which produce decomposition products with low odor and no blooming.

Peroxyketal peroxides are widely used for crosslinking and polymer modification. Since they have fewer half-lives than dialkyl peroxides, they provide faster reaction times at a given temperature. The peroxyketal peroxides should be considered as replacements for dialkyl peroxides when lower curing temperatures are required in order to reduce curing times. The type of elastomer or polymer to be crosslinked or modified will determine if peroxyketals will be a suitable choice.

Peroxyketals generate a combination of weak and strong free radicals, based on hydrogen bond dissociation energies, which means that peroxyketals are less efficient than dialkyl peroxides when crosslinking saturated polymers or polymers with low levels of unsaturation.

          VAROX 230-XL PDR
VAROX 230-XL PDR is an organic peroxide crosslinking agent BR, CPE, CR, EPDM & EPM, EVA, HNBR, NBR and SBR. While providing low-crosslinking efficiency, it offers fast cure rates. The proper selection of a crosslinking coagent improves the crosslinking efficiency and obtains the desired cure rate.

          VAROX 231
Vulcanizing agent for SBR, NBR, EPM, CPE, EPDM and silicone. Very effective at low curing temperatures. Also, as crosslinking agent for PE and EVA. Recommended curing temperature 275-350^°F.

          VAROX 231-XL
VAROX 231 at 40% assay on an inert carrier.