As one of China’s leading manufacturers of LSR (Liquid Silicone Rubber) injection molding, GYF boasts a comprehensive technical system covering material development, mold design, and multi-material injection. It can meet the stringent requirements of high-standard industries such as medical, infant, automotive, industrial electronics, and smart wearables.
We specialize in producing high-precision, complex geometric, and functionally integrated silicone components, with automated mass production capabilities to achieve stable and consistent global supply.
High-precision injection molding: Features closed-loop pressure/temperature control, micro-injection technology, and cavity balance design. It ensures dimensional consistency of micro-sized and complex parts, reducing rework.
Multi-material overmolding (LSR + PP, PC, PA, ABS, TPE, metal, etc.): Adopts surface energy treatment, interface adhesion optimization, and thermal expansion matching design. Delivers Class 1 bonding strength, eliminating the need for post-assembly and reducing costs.
Multi-component injection (2K/3K): Enables integrated molding of LSR with thermoplastics and metals, realizing functional integration and lightweight design.
Complex geometric structure molding: Utilizes flow simulation, splitting and exhaust optimization, and micro-hole/thin-walled molding. Capable of manufacturing ultra-thin parts with undercuts and micro-cavity structures.
Customized material formulations: Offers medical-grade, food-grade, conductive, high-temperature resistant, flame-retardant, and spray-free formulas. Provides differentiated product performance and industry certification support.
Fully automated production: Includes automatic demolding, welding and trimming, visual inspection, and robotic operation. Ensures lower defect rates, consistent quality, and cost-effective mass production.
High-cleanliness production environment: Features medical-grade Class 10,000 clean workshops and environmental control. Capable of producing medical and infant contact-grade components.
Manufacturable Structures and Functional Component Types
✔ Micro thin-walled parts (0.2–0.4 mm)
✔ Waterproof and sealing structures (IP67/68)
✔ Functional buttons & dust/sweat-proof components
✔ Conductive, thermal conductive, and flame-retardant functional parts
✔ Overmolded structures (integrated plastic/metal)
✔ Complex geometric parts (undercuts, micro-grooves, micro-holes)
✔ Optical-grade transparent parts (lenses, light covers)
Customizable LSR Material Properties
Medical/Food-grade: FDA, LFGB certified, high purity.
Industrial/Automotive-grade: High-temperature resistance (250°C), fuel and grease resistance, chemical corrosion resistance.
Electronic functions: Conductive, insulating, high flexibility, anti-yellowing, UV resistance.
Special functions: Flame-retardant, antibacterial, airtightness, blue light blocking, enhanced adhesion.
Typical Production Cases
Medical: Ventilator seals, infusion tube connection caps, sampling tube sealing plugs
Infant & Toddler: Pacifiers, teething toys, maternal and child feeding accessories, children’s protective parts
Smart Wearables: Watch straps, buttons, sensor waterproof rings, back cover buffer seals
Automotive: LED lamp sealing rings, sensor overmolded parts, wiring harness waterproof rings
Industrial Electronics: Battery waterproof rings, flame-retardant buttons, thermal conductive silicone overmolded components
Quality Systems and International Certifications
✔ IATF16949 (Automotive)
✔ ISO13485 (Medical)
✔ FDA (Food Contact)
✔ ISO22000 (Food Safety)
Full-process traceability | Automated inspection | Batch consistency control | High-cleanliness production
As a high-end silicone molding technology provider, GYF takes automation and intelligent manufacturing as the core driving force, building a full-process automated mass production system from feeding, molding, part removal, inspection to packaging, effectively improving efficiency and delivery consistency.
138 compression molding hydraulic presses
50 liquid silicone rubber (LSR) injection molding machines
48 precision injection molding equipment
15 high-efficiency extrusion production lines
In-house mold center + automation R&D team
Multi-factory collaboration (Shenzhen/Huizhou/Dongguan, China + Bangkok, Thailand)
Automation is not only about high efficiency, but also a guarantee of global quality consistency.
Liquid Silicone Rubber (LSR) boasts excellent fluidity and rapid curing characteristics. GYF achieves high-precision molding of micro-sized dimensions, complex structures, and multi-material integration through precision injection molding technology, process algorithm control, and mold engineering capabilities. Our high-precision production system meets the strict requirements for dimensional consistency, sealing reliability, and shape stability in the medical, automotive electronics, smart wearables, and sealing industries.
High-Precision Injection System
Adopting a full closed-loop servo control system to achieve stable glue injection volume and pressure control. The injection repeatability accuracy reaches ±0.01g, with precise control over injection rate, pressure curve, and matching of holding pressure and cooling.
Advantages: No flash, controllable shrinkage, and clear detailed structures.
Precision Mold Engineering
High mirror-finish cavity processing (Ra ≤ 0.4), with micro-cavity fitting tolerance up to ±0.01–0.02mm. The mold adopts thermal-electric balance and vacuum venting structures to prevent gas marks and flash, and is designed for multi-material molds compatible with LSR/plastic/metal inserts.
Value: Precise filling + stable demolding + extended mold service life.
Micro-Size and Complex Structure Capabilities
Capable of molding thin-walled parts (<0.2mm), micro-holes="">
Multi-Material Integrated Molding (Overmolding/Multi-Component)
Supports integrated injection molding of LSR + PC/PA/PBT/ABS/metal, with a strong bonding interface that eliminates secondary assembly, improving waterproof performance and structural stability. Suitable for automotive connectors, consumer electronics seals, and electrical encapsulation parts. It reduces assembly steps, lowers costs, and enhances protection levels (IP67+ IP68).
Industrial Value of Precision and Stability
For the medical industry’s requirements of micro-size, no flash, and biosafety, GYF provides guarantees through vacuum venting, material traceability, and post-vulcanization. For the automotive industry’s demands of high temperature resistance, long-term sealing, and flame retardancy, it relies on IATF-compliant processes, adhesive overmolding, and stable curing. For electronic wearables that require soft touch, color consistency, and waterproofing, it achieves this through tolerance control and IP structural sealing. For industrial applications needing strong insulation, chemical resistance, and uniform thickness variation, it leverages precision mold cavities and injection curve matching.
High precision is not just about dimensions, but also about stability and consistency.
With stable process control + intelligent manufacturing data traceability system, GYF achieves long-term consistent precision under mass production conditions. It not only ensures the accuracy of individual part dimensions but also guarantees the repeatability of cycle, batch, and annual supply.
GYF boasts industry-leading multi-material overmolding technology, enabling firm integrated molding between Liquid Silicone Rubber (LSR) and substrates such as thermoplastics (TPE/PC/ABS/PP/PA, etc.), metals, and ceramics. Through chemical bonding, mechanical locking structures, or micro-textured interface enhancement, a single product achieves the optimal balance of structural strength, flexible touch, and functional integration.
Scope of Multi-material Overmolding Capabilities
LSR + Thermoplastics: Widely used in sealing, flexible touch, and waterproof/sweatproof structures.
LSR + Metals (Stainless Steel/Aluminum/Titanium): Applied for anti-slip and protective components in medical and sports equipment.
LSR + Electronic Substrates: Enhances shock resistance, protection, structural fixation, and flexible key touch.
LSR + Glass & Ceramics: Suitable for smart device buttons, wear-resistant exterior parts, and decorative protective components.
Multi-shot Molding (LSR + 2~3 Materials): Realizes integration of waterproof sealing, flexible operation areas, and structural support.
Technical Capabilities, GYF Advantages, and User Value
Interface Bonding Technology: GYF optimizes formula-level bonding enhancement and interface treatment processes. This delivers strong adhesion to prevent detachment, making products suitable for long-term use.
Multi-cavity/Multi-station Injection Molding: Supports 2K/3K LSR overmolding with precise positioning. It achieves one-time molding of multi-functional integration.
Overmold Tooling R&D Capabilities: Incorporates built-in pre-locking structures and textured bonding enhancement designs. This solves the challenges of difficult bonding between dissimilar materials and complex structure molding.
Automated Overmolding Manufacturing: Features robotic arm positioning, automatic mold clamping, and part removal. It ensures high batch consistency, adapting to large-scale mass production.
Product Advantages Brought by Multi-material Overmolding
More comfortable to use: Soft wrapping enhances grip and touch experience.
Higher protection performance: Anti-slip, sweatproof, shockproof, waterproof, and dustproof.
More stable structure: Overmolding strengthens fixation, reducing the use of screws and buckles.
Greater design freedom: Integration of appearance, function, and structure.
More durable: Stable bonding, resistant to aging, cracking, and detachment.
Typical Application Fields
Medical equipment handles, anti-slip overmolding for surgical tools.
Smart wearables & sports watch straps, buttons, and structural components.
Mobile phone waterproof buttons, flexible encapsulation parts, and side key protection.
Shockproof and anti-slip wrapping for power tools, automotive waterproof sealing modules.
Flexible protection and exterior overmolding parts for metal/plastic appliances.
Based on material formulation research, crosslinking structure enhancement, and optimization of various molding processes, GYF can customize silicone products that work stably for a long time under harsh conditions such as extreme temperature, humidity, chemical corrosion, mechanical stress, and ultraviolet (UV) radiation. Whether facing high-frequency motion wear, medical disinfection impact, marine salt spray corrosion, or extreme temperature changes inside and outside automotive cabins, GYF ensures the product’s sealing performance, adhesion, dimensional stability, and functional reliability.
Extreme temperature (-60℃ ~ 260℃): Resists softening at high temperatures and cracking at low temperatures. Applied in automotive engine components and oven seals.
High humidity and water pressure environments: Achieves IPX8-level waterproof sealing. Suitable for smart wearables and diving equipment sealing rings.
Salt spray and chemical corrosion: Resists oil, acids, alkalis, and salt spray. Used in marine engineering equipment and medical devices.
Mechanical fatigue and impact: Offers high resilience, tear resistance, and compression set resistance. Applied in sports equipment protective parts and shock-absorbing pads.
UV/ozone/aging: Withstands outdoor weathering for over 10 years. Suitable for automotive exterior parts and solar equipment seals.
Independent Development of Material Formulations
Customizable composite properties include high-temperature resistance, oil resistance, medical biocompatibility, food-grade compliance, flame retardancy, and conductivity.
Synergistic Design of Structure + Material
Enhances long-term stability through reinforcing ribs, locking structures, anti-detachment bevels, and gradient overmolding. Strengthens molding processes with high-consistency compression molding, extrusion, and LSR injection. Adopts post-vulcanization, plasma surface treatment, and interface adhesion enhancement. Conducts in-situ reliability tests such as high-low temperature cycling, accelerated salt spray aging, fatigue, and compression set testing.
Relying on precision mold development, microchannel control, ultra-thin parting surface sealing technology, and material rheology optimization capabilities, GYF can stably mass-produce micro-sized, complex, and multi-functional silicone structural parts. These products meet high-demand scenarios such as precision sealing, accurate touch control, conductive transmission, biocompatible implantation, and integrated overmolding.
Such products typically face technical challenges including micro-size (minimum wall thickness 0.1–0.3 mm), complex geometry, integrated functions, and extremely high requirements for precision and consistency. Through the synergy of compression molding, extrusion, and Liquid Silicone Rubber (LSR) injection technologies, GYF achieves extremely high design freedom and batch repeatability.
