Silicone Molding

LSR injection.
HTV compression.
Medical + food grade.

Custom silicone molded parts via LSR (liquid silicone rubber) injection molding or HTV (high-temperature vulcanized) compression molding. Medical-grade (USP Class VI), food-grade (FDA 21 CFR 177.2600), -50 to +230 °C service range. Seals, gaskets, medical devices, consumer products.

Silicone Molding Quote Silicone material

LSR + HTV -50 to +230 °C USP Class VI -50 Shore A to 90

01 · Silicone processes

Silicone molding processes.

Different silicone processes suit different production volumes and part geometries. LSR for high-volume precision, HTV for larger parts and lower volumes.

LSR injection molding

Liquid + pumped

Two-component liquid silicone rubber pumped into heated mold, cures in seconds. Fastest cycle, best for precision small parts in high volume.

HTV compression molding

Gum stock · batch

High-temperature vulcanized silicone gum compressed in heated mold. Slower cycle, cheaper tooling. Best for larger parts or lower volumes.

Transfer molding

Mid-volume compromise

Gum stock transferred via piston into cavity during cure. Between compression and injection in complexity.

Overmolding / insert

2K silicone

Silicone over-molded onto rigid substrate — plastic or metal. Creates integrated assemblies.

Specialty formulations

Medical, food, conductive

Medical-grade (USP Class VI), food-grade (FDA), conductive (EMI gasket), fluorosilicone (fuel resistant).

Color matching

Custom colors

Any custom color via pigmented silicone compounds. Pantone matching available.

02 · Silicone applications

Silicone molded products.

Medical tubing & catheters

Medical-grade silicone tubing — biocompatibility for body contact

Baby products

Baby bottle nipples, pacifiers, teething rings — FDA food-grade, sterilizable

O-rings & gaskets

Standard and custom silicone O-rings and gaskets

Keypads & buttons

Electronic keypads, tactile button overlays

Cookware & kitchen

Spatulas, cooking molds, bakeware — temperature resistant

Automotive seals

Engine compartment seals, weather stripping

Aerospace seals

Aircraft fluid system seals, interior gaskets

Medical implants

Pacemaker housings, neurostimulator components, breast implants

Wearable devices

Medical and consumer wearable silicone interfaces

FAQ

Silicone Molding questions.

LSR: fast cycle (30-90 seconds), best for high-volume small parts, expensive tooling ($15,000-50,000). HTV: slower cycle (2-10 minutes), cheaper tooling ($3,000-15,000), better for lower volumes or larger parts. Break-even: around 5,000-10,000 parts annually. For medical devices with FDA registration, LSR is increasingly standard (better process control, more consistent). For consumer and industrial silicone, either works.

USP Class VI: biocompatibility standard for medical devices. ISO 10993: broader international biocompatibility. Specific requirements: post-cure process to eliminate volatiles (essential for implantables), material traceability from approved suppliers (NuSil, Shin-Etsu, Wacker), documented manufacturing controls. Medical silicone tooling must be isolated from industrial — we maintain separate mold programs for medical work.

FDA 21 CFR 177.2600 covers silicone for food contact. Platinum-cured silicone (vs peroxide-cured) preferred — no peroxide residuals. Post-cure required to drive off volatiles. Approved color additives only. Regular testing for extractables. For food-contact applications, specify platinum-cured, post-cured silicone with documentation.

Silicone overmolds well onto specific substrate materials: PBT, PET, some polyamides (with primer). Requires specific LSR grades formulated for adhesion. Metal overmolding: brass, aluminum, stainless — all possible with appropriate primer. For overmolding where silicone must bond permanently, use specific chemistry. Not all silicones and substrates compatible — test bond strength before committing to production.

Silicone can be pigmented to any custom color. Black is standard (carbon-filled). Red, blue, green, yellow, clear translucent — all standard. Custom Pantone colors possible with dedicated pigment blending. Medical grades available in standard colors; custom medical colors require additional biocompatibility testing.

LSR tooling: 6-10 weeks. HTV tooling: 4-8 weeks. First article production: 1-2 weeks after tool. Ongoing production delivery: 1-4 weeks per order depending on volume. Rush programs: aluminum rapid tooling available (tool in 3 weeks, higher production cost per part). For very urgent programs, silicone casting from master pattern (2-3 weeks) bridges to production tooling.