Chapter 30
LIM for Silicone

In rubber molding, precision comes in many forms.
But when the part must be flawless, flash-free and biocompatible, there’s one process that delivers: Liquid Injection Molding.

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LIM is designed for liquid silicone rubber, known as LSR, a two-part material that flows easily and cures into a highly reliable elastomer.

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It begins with two sealed drums. One holds the base. The other, the catalyst.

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They’re pumped into a metering unit, mixed in a precise ratio and injected as a cold stream into a heated mold.

Inside, the reaction begins almost instantly.

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Cure times are fast, often between 15 and 60 seconds.
The result is a clean, fully formed part.

No preforms, no trimming.

And often, no post-curing at all.

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LIM delivers purity, speed and exceptional dimensional precision. Its flowable nature reaches ultra-thin walls, micro-features and complex geometries that traditional rubber processes simply can’t match.

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It’s cleanroom-ready, built for automation and ideal wherever hygiene, clarity or skin contact are non-negotiable.

The molds themselves are masterpieces.

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Vacuum vents. Cold runners. Polished cavities. Perfectly balanced flow paths.

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No flash traps are needed, because LSR only cures where it belongs.

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Temperature control is everything.

Too hot, it cures too soon. Too cold, it won’t cure at all.

LIM is the gold standard for medical valves and syringes, baby pacifiers and bottle nipples, transparent seals and gaskets, pharmaceutical closures, optically clear components and precision overmolds used in electronics.

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It isn’t just clean. It’s clinical.

Not just efficient. It’s exact.

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LIM is where rubber stops behaving like rubber and starts performing like a material of the future.