What's RTV Silicone?

RTV Silicone (room temperature vulcanization silicone) is a form of silicone rubber made  from a two-component system (base plus curative; A+B) available in a hardness variety of  very soft to medium - usually from 15 Shore A to 40 Shore. RTV silicones is often curable with  a catalyst composed of either platinum or perhaps a tin compound just like dibutyltin dilaurate.  Applications include low-temperature overmolding, making molds for reproducing, and  lens applications for many optically clear grades. according the usage,there also exits food grade silicone with non food grade silicone.        　　Room temperature vulcanized silicone vulcanization reaction not by moisture in the air, but by catalyst for cause.Usually deliver silicon rubber, filler, chain agent as a component packaging, catalyst as another component packaging alone, or use other combinations, but must separate the catalyst and cross-linking agent.No matter adopt what kind of packing way, only when two components are combined with a curing began to occur.Common cross-linking agent is ethyl orthosilicate, catalyst is dibutyl tin laurate.According to the required properties of the final product to join the appropriate fillers and additives.Two-component condensed type room temperature vulcanization silicone vulcanization time mainly depends on the type and dosage of catalyst and temperature.Catalyst sulfide faster, the more shorter on time.At room temperature, solid time is usually a few hours, to prolong the time to shelve the rubber, cooling methods are available.Two-component condensed type room temperature vulcanization silicone to achieve cured at room temperature need a day or so, but under the temperature of 150 ℃ need only 1 hour.Through the use of the accelerator gamma amino propyl triethoxy silane synergistic effect can significantly improve the curing rate. 　　Features of RTV silicone rubber: 　　Good characteristics of easy-operation 　　Light viscosity and good flowability 　　Low shrinkage 　　Favorable tension 　　No deformation 　　Favorable hardness 　　High temperature resistance, acid and alkali-resistance and ageing resistance