Application Fields of LSR Liquid Injection Products
Liquid Silicone Rubber (LSR) injection molding is widely used in industries such as medical care, automotive, smart electronics, baby products, industrial protection, and household sealing systems, thanks to its high-precision molding, automated efficiency, resistance to extreme environments, and multi-material overmolding capabilities. Through multi-component injection molding, LSR overmolding (plastic/metal), micro-size precision injection molding, and medical-grade clean processing capabilities, GYF provides high-performance liquid silicone components for global customers.
1. Medical & Life Sciences
Applicable products: Medical device seals/check valves, infusion sets, breathing masks, soft-touch medical gaskets, surgical tool handles with non-slip overmolding, in vitro diagnostic (IVD) packaging and sealing components, biocompatible microfluidic devices.Advantage matching: Resistant to high-temperature steam, high precision for micro-size parts, suitable for microfluidic and precision valve components.
2. Automotive & New Energy Vehicles
Typical components: High-temperature seals/valve body seals, LSR+metal/plastic overmolded seals, connector waterproof encapsulation parts, automotive lamp lens seals, soft-touch structural parts.Performance advantages: Withstands high temperature up to 300°C, oil-resistant, chemical-resistant, UV-resistant, long-term weatherproof. Supports multi-component injection molding of LSR+PA, PBT, PC, and metal inserts. Produced under the IATF16949 system.
3. Smart Wearables & Consumer Electronics
Typical products: Smartwatch buttons, waterproof seals, AR/VR seals, lens surrounding overmolding parts, sweat-resistant and non-slip soft-touch components, silicone protective cases, earphone accessories, earbuds, etc.Functional value: Features soft touch + sweat corrosion resistance + long-term wearing comfort. Achieves IPX7+ waterproof standard sealing design. Customizable in multiple colors, transparency, and skin-friendly coatings.
4. Baby & Food-Grade Products
Typical components: Pacifiers, baby bottle accessories, soothing pacifiers, non-slip soft-touch handles, food-contact gaskets, steam cooking parts.Compliance standards: Meets FDA/LFGB/BPA-Free/odorless and non-leaching requirements. Secondary vulcanization available for higher safety.
5. Industrial Equipment & Electrical Sealing
Applications: Electrical connector encapsulation and waterproof parts, insulating sleeves, high-temperature protective components, precision dustproof and waterproof seals.Performance advantages: Excellent shock resistance and insulation. Maintains long-term stability in high-temperature and highly corrosive environments. Suitable for IP67/68 protection level sealing structures.
6. Household & High-End Sanitary Sealing Systems
Typical products: Faucet seals, soft-touch switch overmolding parts, high water pressure-resistant seals for sanitary systems.Advantages: Long service life + anti-scaling + resistance to high-temperature cleaning and disinfection. Compatible with overmolding on various metals and engineering plastics.
Typical Cases of Liquid Injection Products
1. Medical Industry
Application Case: Infusion Tube Connection SealsBackground: Seals in medical devices require long-term serviceability and high-precision sealing under high-temperature sterilization and strict hygiene conditions.Technical Challenges: High-precision miniaturized design, medical-grade biocompatibility, high temperature resistance, and corrosion resistance.Solution: LSR injection molding – adopting FDA-certified silicone to ensure no harmful substance release, complying with medical device standards.Functions & Performance: Delivers high sealing performance and thermal stability, suitable for prolonged contact with medications or liquids during use.Result: The product has obtained ISO13485 certification, meeting global medical product standards, and ensuring consistent sealing performance and high durability.
2. Baby Products Industry
Application Case: Baby PacifiersBackground: Baby products must meet stringent requirements including FDA certification, non-toxicity, softness, and easy cleaning.Technical Challenges: Harmless materials, BPA-free, low water absorption, excellent softness, and palatability.Solution: LSR injection molding – selecting food-grade LSR that complies with FDA and LFGB certification requirements to ensure safety for infants.Functions & Performance: Guarantees the softness and comfort of the pacifier, while offering enhanced resistance to high-temperature sterilization to prevent aging from repeated use.Result: The finished product has passed various rigorous safety tests, becoming a trusted high-quality baby product among consumers.
3. Smart Wearable Devices
Application Case: Smart Watch Waterproof SealsBackground: Smart watches require high waterproof rating, wear resistance, low temperature resistance, and UV resistance.Technical Challenges: Providing seals that meet IP67 or higher waterproof standards, while balancing softness and elasticity.Solution: LSR injection molding – using high-performance LSR materials to deliver excellent sealing performance and superior environmental aging resistance.Functions & Performance: Ensures the seal remains effective even after long-term exposure to water, while maintaining flexibility and UV resistance.Result: The finished product helps smart watches achieve IP68 waterproof rating, enhancing market competitiveness and delivering an excellent user experience.
4. Automotive Industry
Application Case: Automotive Sensor Protection PartsBackground: Automotive sensors operate in environments with high temperatures, humidity, and chemical corrosion for extended periods. Their protective components must therefore offer high temperature resistance, corrosion resistance, and UV resistance.Technical Challenges: High-precision dimensional requirements, high temperature resistance, UV resistance, and chemical resistance.Solution: LSR injection molding – utilizing high-temperature resistant LSR materials to maintain performance under high-temperature and humid conditions.Functions & Performance: Improves the compressive strength and chemical stability of the protective parts, ensuring long-term efficient operation of sensors.Result: Compliant with strict IATF16949 certification, guaranteeing long-term stability and reliability of the product in the automotive industry.
5. Consumer Electronics
Application Case: Dustproof and Waterproof Buttons for Wireless EarbudsBackground: Consumer electronics, especially wireless earbuds, require buttons with high waterproofness, pressure resistance, long durability, as well as comfortable touch and sensitivity.Technical Challenges: High-precision button design, dustproof and waterproof capabilities, coupled with good tactile feel and responsive performance.Solution: LSR injection molding – adopting transparent LSR materials to achieve IP67-level waterproof performance while ensuring excellent softness and touch feel.Functions & Performance: Ensures high sensitivity and comfortable tactile feedback of earbud buttons during daily use, with dustproof and waterproof features enhancing product durability.Result: Improves the dustproof and waterproof rating of wireless earbuds, enhances user experience, and effectively boosts product market competitiveness.
6. Industrial Equipment
Application Case: Battery Pack SealsBackground: Battery pack seals require high temperature resistance, anti-aging properties, waterproofness, and flame retardancy to ensure battery safety in extreme environments.Technical Challenges: High sealing requirements, along with high temperature resistance and flame retardancy of materials.Solution: LSR injection molding – using high-temperature resistant LSR materials with excellent flame retardancy and superior sealing performance to ensure long-term stable operation of battery packs.Functions & Performance: Maintains stability of the seal in extreme conditions such as high temperatures and fires, without melting or leaking, preventing potential safety hazards like fires.Result: The battery pack seals have passed strict safety standards, becoming standard components for high-end electronic devices and automotive batteries, and improving battery safety and reliability.
Quality Control of LSR Liquid Injection Products
GYF has established a multi-level quality control system for medical, infant, automotive, electronic, and industrial-grade applications. It achieves full-process traceability and verifiability from materials to molds, and from molding to packaging, ensuring that each batch of products possesses high consistency, high reliability, and compliance with global certifications.
1. Material-Level Quality Control
Material certification adheres to standards such as FDA, LFGB, RoHS, and REACH to ensure global sales and regulatory compliance. Material batch tracing enables tracking of batch numbers, sources, and formula numbers, reducing regulatory review and risks. For material purity, tests for volatile substances, heavy metals, and precipitates are conducted for medical and infant-grade materials to eliminate harmful precipitates and ensure safe contact. Performance stability tests, including hardness, fluidity, volatility, and viscosity stability, guarantee a stable manufacturing process and reduce defect rates.
2. Mold and Molding Process Control
For mold precision, multi-cavity balance simulation, exhaust system optimization, and mirror cavity processing are adopted to improve batch size consistency. The injection process implements closed-loop monitoring of curing time, injection pressure, holding pressure, and temperature control to prevent burrs, shrinkage cavities, and glue overflow. Micro-injection control uses numerical monitoring and variable adjustment, making it more suitable for small and complex structural parts. Fine exhaust groove design combined with local cooling optimization enhances transparency and reduces bubbles and silver streaks in the exhaust and cooling stage.
3. Fully Automated Production and Inspection
Automatic injection plus automatic demolding utilizes robot demolding to avoid manual damage, enabling stable mass delivery. Automatic trimming and assembly reduce labor costs and defect rates. Visual inspection includes automated appearance inspection and dimension measurement, capable of detecting micro-cracks, burrs, material shortages, and bubbles. Functional inspections such as waterproofing, sealing, elastic fatigue, and conductivity tests ensure functional reliability.
4. Functional and Reliability Testing
Mechanical performance tests cover tensile strength, compression set, hardness stability, and fatigue cycles, applicable to watch buttons, sealing rings, etc. Environmental reliability tests include high-temperature resistance (250°C), UV resistance, salt spray testing, and aging resistance, suitable for automotive, outdoor, and industrial scenarios. Chemical compatibility tests involve oil resistance, chemical resistance, alcohol resistance, disinfection resistance, and sweat resistance, which are necessary for medical, infant, and wearable products. Airtightness and waterproofing tests include IP67/IP68 waterproof testing and inflation/negative pressure leak testing, used for electronic sealing, waterproof pens, and watches.
5. Packaging and Cleanliness Control
The production environment features a Class 10,000 clean workshop, suitable for medical and infant-grade products, as well as the medical, food, and mother-and-baby industries. The packaging method adopts dust-free bags, isolation packaging, and automatic labeling. Surface cleanliness is ensured through detection of dust, particles, and volatile substances.
Liquid Silicone Rubber (LSR) injection molding technology has proven its high precision, complexity, and reliability through application cases in multiple industries. GYF's successful cases in medical care, automotive, smart wearables, and infant products demonstrate its outstanding material customization capabilities, precision manufacturing processes, and global certification support, helping customers continuously optimize product design and enhance market competitiveness.
If you have more specific needs or projects, feel free to contact GYF for customized development!
