Reliable Custom Silicone Rubber Gaskets Manufacturer
We specialize in custom silicone gaskets, rubber grommets, and rubber seals, offering multi-material solutions through diverse processing methods to precisely meet the specialized application needs of industries such as electronics, medical, automotive, industrial equipment, and home appliances.
1. Custom Silicone Gaskets with Versatile Processes and Wide Applications
· With extensive experience in customizing silicone rubber gaskets, we offer flexible manufacturing solutions using processes such as liquid injection molding, compression molding and extrusion—for example, custom liquid injection molding parts and custom silicone compression molding parts.
· We offer Custom gaskets and seals made from a variety of materials to ensure performance under demanding conditions—whether it’s heat, weather, oil, or tearing—such as rubber grommets, silicone gaskets, EPDM gaskets, and NBR gaskets.
2. Qualification Certification and Full Process Services
· Industry Certification:SGS certified
· One-stop customized sealing solutions, covering everything from gasket design and rapid prototyping to mass production and DFM analysis.
Silicone Medical Seals
Custom Rubber Seals
Custom Overmolded Seals
Die Cut Seals
Rubber Extrusion Seals
Capabilities of Custom Silicone Rubber Sealing Gasket
Liquid Injection Molding
The molding process of Liquid Silicone Rubber (LSR) is to precisely mix component A (silicone base material) and component B (curing agent) through automated equipment and inject them into a high-temperature mold in a closed injection system. Under the action of platinum catalyst, Liquid Silicone undergoes an addition reaction quickly to achieve rapid vulcanization molding.
High design freedom
Complex three-dimensional structures can be precisely formed and integrated with metal/plastic inserts.
Zero pollution in production environment
Clean room automated production eliminates external pollution and meets medical-grade cleanliness standards.
Industrial mass production capability
LSR molding can achieve micron-level structure replication (such as 0.1mm thin wall), and the vulcanization cycle is as short as a few seconds. It is particularly suitable for automotive precision seals (new energy battery packs), high-end electronics (waterproof connectors) and other fields that have strict requirements on material purity and dimensional accuracy.
1. Medical and Consumer Goods Industries:
Silicone raw materials comply with medical and food grade safety specifications, have passed FDA and LFGB certification, are odorless, non-toxic, and have excellent biocompatibility , and are widely used in high-standard fields such as medical devices and food safety.
Custom Silicone Medical Syringe Piston
Medical Grade Silicone Syringe Bellows
Medical Silicone Gasket
Silicone Mushroom Valve
2. Consumer Electronics Seals:
LSR molding technology enables the production of ultra-thin walls as thin as 0.1 mm, making it ideal for manufacturing seals for micro connectors, sensors, and other precision electronic components with complex geometries. It meets demanding requirements for electrical insulation, flame retardancy, and IP68-rated waterproof and dustproof protection, and is widely applied in mobile electronics and other high-performance applications.
Charging Port Waterproof Ring
Precision Silicone Sealing Ring
Waterproofing Of Equipment
Waterproof Sealing Parts
3. Auto Parts: High temperature resistant sealing ring, shock absorbing pad:
The LSR (Liquid Silicone Rubber) molding process enables high-precision, high-volume production of complex shapes, including curved and custom seals, with consistent quality. It supports insert molding with metal or plastic parts to create multifunctional composite seals. Ideal for industrial and automotive applications, LSR offers excellent resistance to heat, chemicals, UV, and ozone.
Overmolding Services
Silicone Overmolding combines liquid silicone (LSR) with a variety of substrates (including engineering plastics, metal alloys, ceramics, etc.) through injection molding technology to form an integrated component with composite functions. It can meet special application requirements such as shockproof, waterproof sealing, etc.
Total sealing solution
Silicone can form molecular bonds with substrates such as PC, ABS, and metal. This process allows coverage of complex geometries—including threads and snap-fit structures—eliminating assembly gaps, enhancing space efficiency, and ensuring more reliable sealing performance.
Cost and process advantages
The overmolding process enables one-piece integration, eliminating the need for traditional seal assembly. Silicone is applied only to the areas requiring sealing, which reduces the use of high-end materials and allows for fast, high-consistency mass production.
1. Rubber to Metal Bonding Accessories
Rubber To Metal Bonding
Overmolding Seal
Rubber Overmolded Accessories
Rubber To Metal Parts
2. Electronic Precision Sealing Applications
Overmolded Gaskets
Silicone-Gasket Parts
Equipment Waterproof Seal
Overmolded Components
3. Daily Utensil Sealing Fittings
Rice Cooker Sealing Ring
Insulation Container Seal
Insulated Iunch Box Seal
Coffee Cup Seal
Custom Die Cut Seals
The die cut process is to customize the mold (knife mold) according to the shape of the product, and use the sharp blade of the mold to cut the material into a specific shape under pressure.
Various material processing
Our process supports a wide range of materials—including rubber compounds (e.g. NBR, EPDM), foam, PTFE, conductive adhesives, and insulating substrates such as MYLAR (PET), PC, PP, fiber, and nylon—enabling us to deliver customized sealing solutions tailored to diverse industrial applications.
High efficiency and precision production
Die-cutting technology enables 24-hour continuous production and meets the processing demands of complex-shaped functional composite seals—such as those with integrated adhesive backing or single-process formed conductive, thermally conductive, and EMI-shielding components.
1. Flexible materials: silicone, rubber sheet, foam, adhesive tape
2. Composite materials: conductive adhesive, electromagnetic shielding materials
3. CNC products
Extruded Rubber Seals
The rubber extrusion process is a processing method that forces rubber raw materials (solid compound or liquid rubber compound) through a custom mold and design die (die/DIE) under heating and pressurization conditions to produce long strip products with a specific cross-sectional shape. It is widely used in the production of products such as sealing strips, hoses, and light strips.
1. LED Silicone Lamp Shade LED
2. Silicone sealing strip
3. Foam silicone seal
Rubber Material Properties Introduction
There are many types of rubber materials used in custom rubber seals, custom rubber gaskets, and custom O-rings, each with unique physical and chemical properties. According to the needs of different application environments (such as temperature, chemical media, pressure, etc.), it is very important to select the right rubber material, which directly affects the functionality, stability and stability of the sealing ring.
1. Custom Silicone Rubber Sealing Gasket
Silicone Rubber exhibits excellent temperature resistance(-60°C to +250°C) (-76°F to +482°F), maintaining stable physical properties without releasing harmful substances even under extreme conditions. Its flexibility, durability non-toxic nature and superior biocompatibility make it the ideal material for silicone sealing ring applications across kitchenware, medical devices and industrial equipment.
Silicone performance display
1. Food Grade & Medical Grade Safety
It complies with FDA (food grade), USP Class VI (medical grade), and LFGB (EU food contact standard), and is suitable for food processing, baby products, and medical devices.
Food & Beverage:
· Baby Bottle Seals
· Coffee Machine Gaskets
· Food Packaging Cover Gaskets
Medical & Pharmaceutical:
· Breathing mask seal
· Syringe bellows
· Infusion Bottle Stoppers
· Breathing valve diaphragm
2. Ultra-wide Temperature Range
Withstands extreme temperatures from -60°C (-76°F) to +230°C (446°F), with brief exposure to 300°C (572°F), perfect for demanding applications in both scorching ovens and deep-freeze conditions.
Home Appliances:
· Rice cooker : Pressure valve seal
· Coffee machine : Steam pipe seal
· Electric water heater : Heating tube seal,
Safety valve gasket
3. Excellent Customization Performance
Silicone is easy to process and customize in various colors. Through overmolding or coating techniques, it can be securely bonded to other substrates—such as metal, plastic, or ceramic—to create integrated components that deliver enhanced sealing reliability.
Electronic products:
· Sensor sealing
· Underwater equipment connector encapsulation
· Industrial control button waterproof sealing
Industrial equipment:
· Dust and water proof seals for outdoor electrical equipment
· Rubber seals for hydraulic valves
2. Custom EPDM Rubber Sealing Gasket
EPDM Rubber has excellent weather resistance, ozone resistance and sealing properties, and is suitable for harsh environments such as high temperature, humidity, and ultraviolet rays. It is commonly used in automotive sealing strips, door and window seals, roof waterproofing, and outdoor sealing rings, and is suitable for applications with high durability requirements.
EPDM rubber performance display
1. Excellent Weather Resistance And Ozone Resistance
EPDM can maintain elasticity and will not crack after long-term outdoor exposure (better than NBR, NR and other rubbers).
Automotive Industry:
· Window Seals
· Skylight Waterproof Seal
Construction Industry:
· Door and Window Seals
2. Exhibits Outstanding Water And Chemical Resistance
Suitable for hot water systems, steam pipe sealing (such as car radiators, HVAC).
Industrial:
· Cooling System Seals
· Hot Water Pipe Joints
· Steam Valve Gaskets
3. Superior Electrical Insulation Properties
It is widely used in electrical seals, cable insulation, etc.
Electronics Industry:
· Cable Insulation Layer
· Headlight Seals
· Electrical Cabinet Waterproof Seal
3. Custom Nitrile Rubber (NBR) Sealing Gasket
Nitrile Rubber (NBR) seals are known for their outstanding resistance to mineral oils, fuels, hydraulic fluids, and lubricants. As a cost-effective alternative to high-performance materials like FKM (fluororubber) and VMQ (silicone rubber), NBR is ideal for a wide range of standard sealing applications. It is extensively used in automotive systems, industrial machinery, and household appliances where oil resistance is essential.
Nitrile rubber performance display
1. Excellent Oil Resistance
Highly resistant to mineral oils, lubricants, fuels (gasoline/diesel), making it ideal for oil seals and hoses.
Automotive industry:
· Fuel System O-rings
· Engine Oil Seals
· Transmission Aeals
· Hydraulic Brake Cups
2. Good Abrasion Resistance
High mechanical strength, suitable for dynamic seals (e.g., hydraulic seals, conveyor belts).
Industrial:
· Bearing Seals
· Gearbox Gaskets
3. Cost-effective
The price is significantly lower than fluororubber (FKM) and silicone (VMQ), suitable for low-end and mid-volume applications.
Home appliance industry:
· Washing Machine Drain Pump Seal
· Dishwasher Water Pipe Joint (water resistant + weak detergent)
Custom Silicone Product Workflow — From Idea to Delivery
The following is our product customization process. At Shengxin, turning your ideas into real, high-performance products is what we do best. Partner with us for a smooth, efficient and innovative journey — from concept to completion. Want to see how we bring your ideas to life? Let’s get started.
The following is our product customization process. At Shengxin, turning your ideas into real, high-performance products is what we do best. Partner with us for a smooth, efficient and innovative journey — from concept to completion. Want to see how we bring your ideas to life? Let’s get started.
1.Customization requirement
2.Evaluation& quotation
3.DFM analysis report
4.Mold design & analysis
5.Custom tooling
6.Mold testing and validation
7.Mass production
8.Delivery and after-sales
Custom Rubber Parts Capabilities for Demanding Applications
Shengxin is a custom manufacturer of silicone and plastic components with nearly 30 years of experience. We collaborate directly with well-known brands and deliver fast, engineering-driven solutions. Backed by SGS certifications, our operations are defined by strict quality control and reliable mass production capabilities—supporting a wide range of industries with consistent, on-time delivery.
Get a Free Quote
- We can provide free samples for your reference.
- From concept to completion, we can provide one-stop custom services.
- You may send us samples or 3D CAD drawings in STEP, IGES, X_T, or DWG formats. We will provide a detailed quote within 48 hours.
Get a Free Quote
- We can provide free samples for your reference.
- From concept to completion, we can provide one-stop custom services.
- You may send us samples or 3D CAD drawings in STEP, IGES, X_T, or DWG formats. We will provide a detailed quote within 48 hours.
