Your Professional Silicone Rubber Mold Supplier
Founded in 2010, Protech is a China-based manufacturer specializing in plastic and hardware products, with strong capabilities in high-precision tooling, injection molding, and metal stamping. We operate multiple production facilities with a total area of over 8,000㎡, including a 2,500㎡ tooling factory in Dongguan and a 6,000㎡ molding and stamping factory in Shenzhen.Equipped with advanced CNC machining and precision inspection systems, we support tight tolerances and stable quality.
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![Custom HCR Silicone Mold]()
Custom HCR Silicone MoldProduct Name: Custom HCR silicone injection mold for high reliability Aerospace Sealing Elements. . Product Material: HCR/LSR (Wacker, Dow Corning, Shin-Etsu, Elkem); Medical/Industrial Grades -
![LSR Silicone Rubber Mold]()
LSR Silicone Rubber MoldProduct Details: WTB Connector Matte Sealing. . Material: Premium LSR (Wacker, Dow Corning, Shin-Etsu, Elkem); Medical/Industrial Grades Available. . Mold Structure: Custom Engineered (LSR/HCR); -
![Self-Lubricating Liquid Silicone Rubber Mold]()
Self-Lubricating Liquid Silicone Rubber MoldProduct Name: Self-Lubricating Liquid Silicone Rubber Mold for Automotive Electronics Application. . Mold Structure: 2/4/8/16/32/64 Cavities ，2-Plate/3-Plate Cold Runner Molds. . Mold Material: -
![Connector Sealing Molding]()
Connector Sealing MoldingProduct Name: Custom Electrical Connection Sealing Components. . Product Material: LSR / HCR Silicone Rubber (Wacker, Dow Corning, Shin-Etsu, Elkem) - Grades for HT, FR, LS, FDA, ESD, etc. Grades -
![LSR Silicone Molding]()
LSR Silicone MoldingProduct Name: Customized LSR / HCR Mold for IP68 Sealing Elements. . Mold Structure: 2/3-Plate Mold, with/without Cold Runner System. . Sealing Standard: IP67 / IP68. . Mold Material: SKD61, S136, -
![LSR Silicone Rubber]()
LSR Silicone RubberProduct Name: Connector LSR Sealing Components. . Material Brand: Customized materials, Wacker/Dow Corning/Shin-Etsu/Elkem/Xin'an Tianyu. . Mold Structure: Cold Runner System, Transfer molding -
![Silicone Over Molding Mold]()
Silicone Over Molding MoldProduct Name: Custom Silicone Over Molding Mold for Waterproof Connector Products. . Mold Structure: Precision Engineered 2K (Two-Shot) Over molding System. . Mold Material: Premium Tool Steels:
Why choose us
Our Certificate
Our factories are certified to ISO 9001, ISO 14001, IATF 16949, and supported by UL and SGS audits, ensuring compliance with international quality and environmental standards.
Experienced Engineering Team
Our engineering team boasts a professional design team with over 15 years of experience and a large pool of skilled technicians, ensuring expertise and innovation in every project.
Quality Management
We employ advanced quality management tools such as FMEA, PPAP, ECN, and SPC/CPK to continuously monitor and enhance our processes, ensuring consistent excellence and customer satisfaction.
OEM & ODM
We provide flexible OEM and ODM solutions, supporting customers from concept development and engineering design to tooling, production, and mass delivery.
LSR Silicone Molding
Liquid Silicone Rubber (LSR) is a premium elastomeric material widely used in injection moulding processes due to its exceptional thermal stability, biocompatibility, and long-term durability. LSR moulding parts are engineered for high-performance applications across industries such as automotive, medical devices, consumer electronics, and aerospace. The unique formulation of LSR and its supporting components ensures consistent quality, precision, and reliability under extreme conditions.
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Feature |
Specification |
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Product Name |
Customized LSR/HCR Mold for IP68 Sealing Elements |
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Mold Structure |
2/3-Plate Mold, with/without Cold Runner System |
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Sealing Standard |
IP67 / IP68 |
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Mold Material |
SKD61, S136, 1.2344 (ESR), 1.2316, 1.2738 (HH) |
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Mold Standards |
Meusburger, Hasco, Misumi, DME |
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Key Processes |
Precision CNC, EDM (Sodick, Makino), Wire-Cutting (Sodick, Seibu), Surface Grinding (Yutong), Polishing |
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Monthly Capacity |
20 - 30 Sets |
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Core Applications |
New Energy Vehicle Electronics, Precision Electronic Connectors, Aerospace, Medical Devices, Industrial Control Systems |
Advantages of LSR Silicone Molding
Superior Quality Control
LSR injection molding offers exceptional repeatability and quality control. The automated process minimizes human error and ensures consistent part quality batch after batch.
Design Flexibility
The liquid nature of LSR allows for complex geometries, thin walls, and intricate details that are difficult or impossible to achieve with other materials. Designers can create parts with undercuts, living hinges, and integrated features.
Reduced Secondary Operations
Many LSR parts require minimal finishing operations. The excellent surface finish and dimensional accuracy often eliminate the need for trimming, cleaning, or other post-molding processes.
Environmental Benefits
LSR is recyclable and produces minimal waste during production. The absence of solvents and low energy requirements make it an environmentally friendly manufacturing option.
Type of LSR Silicone Molding
01
Single-Shot LSR Molding
The most common approach where LSR is injected directly into the mold cavity. This method is ideal for simple to moderately complex parts and offers the fastest cycle times.
02
Multi-Shot LSR Molding
Advanced technique allowing multiple materials or colors to be molded in a single cycle. This enables complex assemblies and reduces post-molding assembly requirements.
03
LSR Overmolding
Process where LSR is molded over pre-existing substrates like metal, plastic, or fabric. This creates strong chemical bonds and enables complex multi-material assemblies.
04
Insert Molding
LSR is molded around pre-placed inserts such as metal components, creating integrated assemblies with excellent sealing properties.
Application of LSR Silicone Molding
Consumer Products
LSR is widely used in everyday consumer goods due to its non-toxic nature, heat resistance (typically from -50°C to 200°C), and soft-touch qualities. It is FDA-compliant for food contact, making it perfect for kitchenware such as baking mats, spatulas, and baby bottle nipples.
Medical and Healthcare
In the medical field, biocompatible LSR is essential for manufacturing critical components such as respiratory masks, catheters, implantable devices, and drug delivery systems like insulin pump seals. It meets ISO 10993 and USP Class VI standards, ensuring safety for prolonged human contact.
Electronics
The electronics industry relies on LSR for sealing and protecting sensitive circuits and components from environmental damage. LSR gaskets and encapsulants provide excellent dielectric insulation and remain stable across wide temperature ranges, preventing short circuits and performance degradation.
Automotive Applications
Modern vehicles use LSR components in under-the-hood systems where resistance to heat, oil, and vibration is crucial. Examples include engine gaskets, ignition system seals, sensor housings, and LED headlight lenses.
Industrial Seals and Gaskets
LSR’s resistance to UV radiation, ozone, water, and a broad range of chemicals makes it ideal for demanding industrial environments. It is extensively used in pumps, valves, piping systems, and machinery in sectors like oil & gas, chemical processing, and wastewater treatment.
Aerospace and Defense
Though not originally listed, LSR plays a growing role in aerospace and defense applications. It is used in cockpit seals, avionics insulation, and environmental control systems due to its performance at high altitudes and extreme temperatures.
Customization Options of LSR Silicone Molding
Colour
Available in a wide range of standard or custom colours using pigments compatible with medical or food-grade standards.
01
Hardness
Adjustable from very soft (Shore A 10) to firm (Shore A 80), allowing flexibility in tactile feel and performance.
02
Surface Texture
Can be produced with smooth, matte, textured, or patterned finishes for grip, aesthetics, or branding.
03
Material Additives
Fillers such as silica or conductive materials can be added to enhance mechanical strength, thermal conductivity, or electrical properties.
04
Multi-component Moulding
Overmoulding or two-shot moulding allows integration with rigid plastics or other materials for complex assemblies.
05
Process of LSR Silicone Molding
Material Preparation
The process begins with preparing the two-component LSR system. Part A contains the silicone base and crosslinking agent, while Part B contains the platinum catalyst. These components are stored separately to prevent premature curing.
Dosing and Mixing
Precise metering pumps deliver exact ratios of Part A and Part B to a static mixer. The mixing ratio is typically 1:1 or 10:1, depending on the specific LSR formulation. Consistent mixing is crucial for achieving uniform material properties.
Injection and Molding
The mixed LSR is injected into heated molds (typically 170-200°C) using specialized injection molding machines. The material flows through runners and gates to fill the mold cavities completely.
Curing Process
Heat from the mold initiates the platinum-catalyzed vulcanization reaction. The liquid silicone transforms into a solid elastomer through crosslinking, typically taking 30-180 seconds depending on part thickness and complexity.
Demolding and Finishing
Once cured, parts are automatically demolded. The inherent release properties of LSR often eliminate the need for mold release agents, reducing cycle time and improving part quality.
Materials Used of LSR Silicone Molding
Silicone Rubber (Base Polymer)
The primary component of LSR moulding parts is liquid silicone rubber, a two-part platinum-cured polymer system. Known for its excellent elasticity and resilience, LSR maintains flexibility across a wide temperature range (typically -50°C to 200°C). It resists UV exposure, ozone, and aging, making it ideal for outdoor and critical sealing applications.
Curing Agents (Catalysts)
Curing agents initiate the cross-linking reaction that transforms liquid silicone into a solid, durable elastomer. Platinum-based catalysts are the standard for high-purity LSR due to their clean, efficient cure and lack of byproducts. Peroxide-based systems are an alternative but are less common in precision applications due to potential odor and residue.
Silicone Additives
Additives are blended into LSR formulations to enhance performance, appearance, and processability. Common types include colorants (for identification or branding), release agents (to prevent sticking to moulds), and functional additives like flame retardants or antimicrobial agents.
Filler Materials
Fillers such as fumed silica, glass microspheres, or ceramic powders are added to modify the physical and economic properties of LSR. They reinforce the polymer matrix, improve tear strength, reduce shrinkage, and lower raw material costs. Some fillers also enhance electrical insulation or thermal conductivity.
Maintenance
Cleaning
Use mild soap or detergent with lukewarm water and a soft cloth or sponge. Rinse thoroughly and air dry.
Disinfection
For medical or food-contact parts, use alcohol-based cleaners or approved disinfectants that do not contain harsh solvents.
Avoid
Abrasive cleaners, chlorine-based bleach, strong acids, or alkalis, which may damage the surface or accelerate aging.
Storage
Keep away from direct sunlight, ozone sources (e.g., motors), and extreme temperatures when not in use.
FAQ
We're well-known as one of the leading silicone rubber mold manufacturers and suppliers in China. With over 15 years' experience, we warmly welcome you to buy high quality silicone rubber mold at competitive price from our factory. Contact us for more details.
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