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Injection molding of liquid silicone rubber (LSR) is a process to produce pliable, durable parts in high volume.. Liquid silicone rubber is a high purity platinum cured silicone with low compression set, good stability and ability to resist extreme temperatures of heat and cold ideally suitable for production of parts, where high quality is required.
If making a brush-on rubber mold, the curing time factor between coats is long (longer than urethanes or polysulfides, shorter than latex). Silicone components (A+B) must be mixed accurately by weight (scale required) or else they do not work. Tin-catalyst silicone shrinks somewhat and does not have a long shelf life.
The liquified concoction can be poured into individual molds, tray molds, or blocks. Molds are made of metal or, more commonly, from plastic or reinforced silicone rubber, allowing artisans to make their own molds using a two-part mold kit. Upon cooling, the soap can be removed from the molds as individual soaps, or as blocks for slicing into bars.
Silicone rubber is a reliable solution (as opposed to rubber and thermoplastic elastomers) for migration or interaction problems between the main active ingredients. Its chemical stability prevents it from affecting any substrate it is in contact with (skin, water, blood, active ingredients, etc.).
Two-part silicone systems are used as rubber molds to cast resins, foams, rubber, and low-temperature alloys. A silicone mold generally requires little or no mold-release or surface preparation, as most materials do not adhere to silicone. For experimental uses, ordinary one-part silicone can be used to make molds or to mold into shapes.
The process starts by placing a two piece silicone mold in a vacuum chamber. The raw material is mixed, degassed and then poured into the mold. The vacuum is then released and the mold removed from the chamber. Finally, the casting is cured in an oven and the mold removed to release the completed casting. The silicone mold can be reused. [3]
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