This protective sleeve is formed by liquid silicone rubber overmolding process, it provides anti-slip and shock absorption for better holding comfort, it is wear-resistant, corrosion-resistant and waterproof, fits various tool and equipment handles, supports hardness and color customization, meets food contact safety standards, has longer service life.
Material
Food-grade LSR
Hardness
Shore A 30-60
Temperature
Certifications
Applications
-40°C ~ +200°C
Colors
Black, White, Gray, Customizable
# Liquid Silicone Overmolded Metal Handle Grip Sleeve
The Liquid Silicone Overmolded Metal Handle Grip Sleeve is a high-performance integrated component designed to enhance grip comfort, slip resistance, and durability for metal handle applications across industrial, consumer, and medical sectors. Unlike post-assembled rubber sleeves that can loosen or detach over time, our product uses precision liquid silicone rubber (LSR) injection overmolding to create a permanent, molecular-level bond between the inner metal core and outer silicone grip layer. This manufacturing method delivers consistent wall thickness, uniform texture, and excellent dimensional stability that outperforms conventional dip-molded or stretch-fit rubber sleeves.
Core selling points include: permanent adhesive bonding between LSR and metal substrate, customizable hardness and texture for different application requirements, food-contact and medical-grade material options, excellent resistance to temperature extremes and chemical exposure, and compliance with global safety and quality standards. Whether used for high-load industrial tools or sterile medical equipment, our overmolded handle grip sleeve improves ergonomics, reduces user fatigue, and extends product service life.
The outer grip layer is manufactured from 100% pure platinum-cured liquid silicone rubber, with no added fillers or recycled materials. The inner core uses standard carbon steel, 304 stainless steel, or aluminum alloy as requested by customers. Key material properties are listed below:
Finished products undergo 100% quality inspection to meet the following physical performance requirements:
Our LSR overmolding process adheres to strict process control standards:
Unlike traditional slip-on or glued rubber sleeves that separate from metal handles after repeated use or temperature cycling, our LSR overmolding process uses proprietary metal surface pre-treatment to create a covalent bond between silicone and the metal core. Accelerated aging testing (1000 hours of thermal cycling between -40°C and 200°C) shows zero delamination or bond weakening, eliminating safety hazards from loose grips and reducing replacement costs.
LSR provides a naturally soft, non-slip touch even when wet or oily, outperforming thermoplastic elastomers (TPE) and natural rubber in high-humidity or high-load environments. We can customize the surface texture—from fine matte to raised patterned grip—to match application-specific friction requirements, reducing hand fatigue for users who hold tools or equipment for extended periods. LSR also inherently absorbs vibration, reducing the risk of repetitive strain injury (RSI) for handheld power tools.
We offer three material grades: industrial, food-contact, and medical-grade, all compliant with global regulations. Food-contact grades meet FDA 21 CFR 177.2600 and EU 10/2011 standards for repeated food contact, while medical-grade products comply with ISO 10993-5 biological testing requirements for non-cytotoxicity, making them suitable for invasive and non-invasive medical devices.
Liquid silicone is inherently resistant to UV degradation, ozone cracking, and microbial growth, unlike natural rubber which degrades over time in outdoor or high-moisture environments. It does not leach plasticizers or harmful chemicals into the environment, and maintains its softness and grip performance even after years of exposure to extreme temperatures and common chemicals.
Our liquid silicone overmolded handle grip sleeves are widely used for handheld power tools (drills, grinders, saws), hand tools (wrenches, pliers, hammers), industrial control levers, and material handling equipment handles. The vibration-damping and non-slip properties improve operator safety and reduce fatigue in high-intensity work environments.
Common consumer applications include kitchen tool handles (knives, cooking utensils, barbecue tools), fitness equipment (dumbbells, kettlebells, resistance bands), bicycle handlebar grips, luggage handles, and furniture hardware handles. Food-contact grade materials are safe for repeated food exposure, and easy to clean with common household cleaners.
Medical-grade overmolded grip sleeves are used for surgical instruments, wheelchair handles, crutch grips, hospital bed control handles, prosthetic device grips, and home medical equipment (walkers, oxygen tanks). The product tolerates repeated autoclave sterilization without degrading or losing grip performance, and meets all biocompatibility requirements for clinical use.
For outdoor applications, our grip sleeves are used for camping tool handles, hiking pole grips, fishing rod handles, and sports equipment handles. The UV and water resistance ensures long service life even in constant exposure to sunlight and moisture, without cracking or hardening.
We support both standard and custom size specifications. Common standard inner diameter sizes are 10mm, 12mm, 16mm, 20mm, 25mm, and 32mm, with standard outer diameters 2mm to 6mm thicker than the inner metal core. Custom lengths, diameters, and end contour designs are available to match your specific product requirements. We can also add custom features such as hanging holes, texture patterns, and logo embossing.
All Liquid Silicone Overmolded Metal Handle Grip Sleeves are manufactured under an ISO 9001:2015 certified quality management system. Every production batch undergoes strict incoming material inspection, in-process dimensional and bonding testing, and finished product performance testing before shipment. We test for bond strength, hardness, dimensional tolerance, and surface defects to ensure 100% compliance with specification requirements.
Our products are fully compliant with global regulatory standards: all grades meet ROHS and REACH requirements for restricted substances; food-contact grades are certified to FDA 21 CFR 177.2600 and EU 10/2011; medical-grade products are tested for biocompatibility per ISO 10993-5. We provide full material test reports and certification documentation upon request to support customer product compliance and regulatory submission.
We offer a 12-month quality guarantee for all standard products, and can provide customized validation testing to meet specific customer application requirements. Our engineering team works closely with customers from prototype to mass production to ensure the final overmolded grip sleeve meets all performance and design expectations.
