Produced with high-quality liquid silicone rubber raw material, it features high precision, good sealing performance, and excellent temperature and aging resistance. It supports customized injection molding processing of multiple specifications to meet production needs of different products in various industries
Material
Industrial LSR
Hardness
Shore A 10-80
Temperature
Certifications
Applications
-40°C ~ +200°C
Colors
Black, White, Transparent, Customizable
# LSR Liquid Silicone Rubber Injection Molding Parts
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LSR Liquid Silicone Rubber injection molding parts are high-precision custom silicone components manufactured through a fully automated, closed molding process that leverages the low viscosity of two-part platinum-cured liquid silicone rubber. This process offers unmatched consistency, geometric tolerance control, and production scalability for complex silicone components across demanding industries. Unlike conventional compression molded silicone parts, LSR injection molded components deliver zero flash, clean surface finishes, and repeatable mechanical properties even for micro-scale features.
Our LSR injection molding parts are fully customized to customer CAD specifications, with capability to produce low-volume prototype batches (10–500 units) and high-volume mass production (100,000+ units) with identical material properties and dimensional accuracy. The process combines the inherent performance benefits of silicone rubber — including wide temperature resistance, biocompatibility, and chemical inertness — with the design freedom enabled by precision injection tooling, making it ideal for applications that cannot tolerate the inconsistency or waste of traditional molding methods.
Core selling points include:
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All LSR injection molding parts use medical-grade, platinum-cured two-part liquid silicone rubber, with no peroxide byproducts or residual leachable additives. Key material properties are outlined below:
Finished LSR injection molded parts deliver consistent mechanical performance across production runs:
Our precision injection molding process adheres to strictly controlled parameters to ensure part consistency:
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The closed, high-pressure LSR injection molding process eliminates the excess material flash common to compression and transfer molding, even for thin-walled and complex parts. This eliminates the need for manual deflashing, trimming, or grinding, reducing labor costs and eliminating the risk of part damage during secondary processing. For most applications, parts come out of the mold ready for use, with no additional finishing required.
Low-viscosity liquid silicone flows uniformly into all areas of the mold cavity, enabling the replication of intricate features, thin walls (as thin as 0.15 mm), undercuts, and micro-textures that cannot be achieved with higher-viscosity solid silicone rubber. This makes LSR injection molding ideal for micro-fluidic components, wearable device seals, and miniature medical components that require extremely tight dimensional control.
Platinum-cured LSR used in our injection molding process is inherently free of toxic additives, peroxides, and leachable byproducts. All standard material grades meet FDA 21 CFR 177.2600 for food contact, ISO 10993-5 for cytotoxicity, and USP Class VI for long-term medical implantation, eliminating the need for expensive material qualification for regulated applications.
LSR injection molding enables seamless overmolding onto rigid thermoplastics, metals, glass, and other substrates in a single process step. The adhesion between LSR and the substrate is chemically bonded, eliminating the need for adhesives and creating a durable, leak-proof bond ideal for handles, seals, and multi-material consumer and medical devices.
The fully automated process delivers consistent quality from prototype to mass production. Tooling can be produced for low-volume prototyping in 7–10 days, and scaled to high-volume production with multi-cavity molds that reduce per-unit cost and lead time for large orders.
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LSR liquid silicone rubber injection molding parts are used across a wide range of demanding industries, including:
Custom seals, gaskets, and components for diagnostic devices, wearable insulin pumps, continuous glucose monitors (CGMs), surgical instruments, and implantable devices. The biocompatible, sterilizable nature of LSR makes it ideal for repeated autoclaving, EtO, or gamma sterilization without performance degradation. Common parts include syringe gaskets, valve diaphragms, overmolded surgical handle grips, and micro-fluidic channel components.
FDA-compliant seals, gaskets, valve components, and kitchenware parts for coffee machines, food processing equipment, beverage dispensers, and baby products. LSR resists staining, odor absorption, and repeated cleaning with common food-safe sanitizers, making it ideal for long-term food contact use. Common applications include baby nipple shields, valve seals for water bottles, and gaskets for food processing containers.
High-temperature resistant seals, gaskets, vibration dampers, and connector components for powertrain, sensor, and interior applications. LSR maintains its elasticity and sealing performance across extreme temperature fluctuations, resists automotive fluids and UV exposure, and meets automotive flammability requirements. Common parts include O-rings for engine sensors, weather seals for lighting assemblies, and vibration isolators for interior electronics.
Waterproof seals, gaskets, keypads, and overmolded housing components for smart watches, fitness trackers, hearing aids, and portable electronics. LSR offers a soft, non-slip surface feel, excellent resistance to skin oils and sweat, and enables IP67/IP68 waterproofing when precision molded. Common applications include hearing aid domes, smart watch bezel seals, and wearable device straps.
Seals, diaphragms, and damping components for valves, pumps, and industrial processing equipment. LSR’s chemical inertness and wide temperature range enable long service life in harsh industrial environments.
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Choose LSR hardness based on your application’s functional requirements:
We accommodate custom part dimensions from 1 mm x 1 mm micro-components up to 400 mm x 400 mm large-format parts. Multi-cavity tooling is available for high-volume production of small to medium-sized parts to reduce per-unit cost.
Select material grade based on regulatory requirements:
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All LSR injection molding parts are produced in an ISO 9001:2015 and ISO 13485:2016 certified manufacturing facility, with full traceability from raw material batch to finished part delivery. Our quality control process includes:
Our standard material grades are certified to FDA 21 CFR 177.2600, USP Class VI, ISO 10993, REACH, and RoHS requirements. We support customer design for manufacturing (DFM) reviews to optimize part geometry for LSR injection molding, reducing tooling cost and improving part performance before full production.
