We are a professional manufacturer providing liquid silicone rubber overmolding on metal processing services. Adopting high-quality LSR materials and precision injection molding process, our products feature strong bonding, excellent sealing performance and high dimensional accuracy, supporting customized production for various industries.
Material
Industrial LSR
Hardness
Shore A 20-80
Temperature
Certifications
Applications
-40°C ~ +200°C
Colors
Black, White, Gray, Customizable
# Custom LSR Overmolding Metal Components Manufacturer
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As a specialized manufacturer of liquid silicone rubber (LSR) overmolding on metal components, we provide fully customized, high-precision integrated parts that combine the structural strength of metal with the elasticity, insulation, and non-slip properties of LSR. Our expertise spans the entire product development process: from material formulation and mold design to precision injection molding and post-processing, delivering ready-to-assemble overmolded components that meet the most stringent industry requirements.
LSR overmolding on metal creates a permanent molecular bond between the two materials, eliminating the risk of delamination common in assembled rubber-metal parts. Our production process leverages automated liquid silicone injection molding technology to achieve tight tolerances, consistent geometric dimensions, and high-volume production stability. Whether you need prototype development for new product design verification or mass production for commercial applications, our end-to-end manufacturing service adapts to your specific performance, shape, and volume requirements. We serve a wide range of industries including consumer electronics, medical devices, automotive, industrial equipment, and household appliances, with core capabilities in complex geometric overmolding, multi-hardness LSR integration, and strict compliance with industry-specific material standards.
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Our LSR materials are formulated for optimal adhesion to common metal substrates, including stainless steel 301/304/316, aluminum alloy 6061/7075, copper alloy, carbon steel, and electroplated nickel. All LSR compounds meet the following material standards:
Our standard LSR overmolding process adheres to the following controlled parameters for consistent quality:
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We use a proprietary metal surface pretreatment process and adhesion-promoting LSR formulation to create a strong covalent bond between LSR and the metal insert, rather than relying solely on mechanical interlocking. This allows our overmolded components to withstand long-term thermal cycling, repeated mechanical impact, and exposure to water, oil, and common cleaning chemicals without peeling or separation.
Our automated injection molding process and in-house CNC mold manufacturing enable us to achieve tolerances as tight as ±0.02 mm, making us capable of producing overmolded components with complex undercuts, multi-level surfaces, and integrated sealing structures. We also support multi-hardness LSR overmolding on a single metal insert, to meet different performance requirements in different areas of the same component.
We offer a full range of LSR formulations tailored to different application environments, from food-contact and medical-grade silicone that meet biocompatibility requirements to flame-retardant and high-temperature resistant silicone for automotive and industrial applications. All raw materials are sourced from international brands such as Dow Corning, Wacker, and Shin-Etsu, with full material traceability from batch to finished product.
As an integrated manufacturer, we handle all processes in-house: metal insert CNC stamping/machining, surface treatment, mold design, LSR overmolding, post-processing trimming, and quality inspection. This eliminates the cost and lead time associated with working with multiple suppliers, while ensuring consistent quality across the entire component. We support both low-volume prototype development (1–100 pieces) and high-volume mass production, with flexible lead times to match your project timeline.
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Our custom LSR overmolding metal components are widely used in the following industries and use cases:
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Choose LSR hardness based on your application requirement:
We support fully custom dimensions based on your 2D drawings or 3D CAD files. Our standard capabilities cover components from 5 mm to 600 mm in maximum dimension. For components larger than 600 mm, we can provide split overmolding solutions upon project evaluation. Minimum order quantity is 100 pieces for mass production, and 1 piece for prototype development.
Select the appropriate LSR grade based on your industry and application:
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We implement a full traceability quality control system covering all stages from raw material incoming inspection to finished product outgoing inspection. All raw materials are tested for hardness, density, and purity before entering production. In-process inspections include dimensional checks, adhesion testing, and visual inspection for surface defects. Finished products undergo 100% visual inspection, and batch testing for peel strength, compression set, and compliance with material specifications.
Our manufacturing facility is certified to ISO 9001:2015 quality management system and ISO 13485 medical device quality management system. All custom overmolded components are supplied with material test reports (MTR), certification of compliance, and process documentation upon request. We provide sample approval before mass production, and offer free rework or replacement for any non-conforming products to ensure your project requirements are fully met.
