In most cases, cheaper bags are cheaper quality products; cheaper quality means use of different raw materials and different production processes.
Uncured silicone rubber contains polymers of different chain lengths. It always comprises a principal silicon-oxygen-chain (the siloxane backbone) and an organic moiety bound to the silicon. The properties of silicone rubber vary greatly depending on the organic groups and the chemical structure.
The organic groups may be methyl, vinyl, phenyl or other groups. Apart from its chemical structure the raw material, silicone rubber, may also be classified by its viscosity: solid silicone rubber with polymers of higher molecular weight and relatively longer polymer chains or liquid silicone rubber with polymers of lower molecular weight and shorter chains.
To become an elastomeric material, raw silicone rubber always has to be cured with crosslinkers; this can be done either by peroxide or addition curing. The silicone rubber of all of our products is cured by Platinum-catalyzed hydrosilylation, in which at temperatures from 120-200°C the crosslinker H-siloxanes groups react with the vinyl groups of the polymer to form C=C double bonds. The cured rubber is odor- and flavorless, it demolds very easily and has a dry surface. Though extremely flexible, the cured product is strong and durable, giving it a lifetime of 500+ dishwasher cycles or five years+ at proper product care.