Precision Liquid Silicone Injection Products

These are composite products integrating liquid silicone with prefabricated hardware/plastic substrates through insert or two-step injection molding. After high-temperature vulcanization, silicone and substrate form a firm bond, with a core structure of substrate (hardware/plastic) and silicone coating.
Core functions: ① Performance integration, combining substrate rigidity with silicone’s softness and sealing; ② Protection, preventing substrate corrosion/wear and enhancing waterproof, anti-slip and insulation performance; ③ Functional optimization, customizable hardness, color and surface effects to meet special needs. They are widely used in multiple fields and are key to modern precision manufacturing.

Silicone-covered Hardware Products: Metal substrate (stainless steel, aluminum alloy, etc.), coated with LSR via insert molding. Features: High structural strength, firm bonding, wear/temperature resistance, anti-corrosion. Common styles: Handles, knobs, sensors. Applicable to automotive parts, medical devices, industrial tools and kitchenware.
Silicone-covered Plastic Products: Plastic substrate (PC, ABS, nylon, etc.), combined with LSR via two-step injection molding. Features: Lightweight, low cost, good moldability, improved touch and waterproof performance. Common styles: Buttons, casings, wearable parts. Applicable to consumer electronics, smart wearables, daily necessities and toys.

Core Silicone Raw Material: Two-component addition-cure LSR (1:1 ratio), high-temperature curing (150-200℃), non-toxic, FDA/RoHS certified, temperature range -65℃ to 250℃. Customizable hardness (Shore A 20°-80°) and special properties (flame-retardant, medical-grade).
Substrate Materials: Hardware (stainless steel, aluminum alloy, etc.) needs surface treatment and primer for firm bonding; plastic (PC, ABS, etc.) has good high-temperature resistance and silicone compatibility, no additional primer needed.
Primers: Essential for hardware substrates, forming a "molecular bridge" between silicone and metal to ensure bonding. High-quality products have firm bonding, uniform coating and no defects; inferior products easily peel or have bubbles.

Silicone Layer Peeling: Insufficient substrate surface treatment, improper primer use, incorrect silicone ratio, or insufficient vulcanization.
Bubbles/Missing Material: Poor mold exhaust, fast injection speed, uneven silicone mixing, or residual air on the substrate.
Surface Burrs: Insufficient mold clamping force, high injection pressure, or mold foreign objects.
Substrate Deviation/Exposure: Unreasonable mold positioning, low accuracy, or excessive injection impact.
Yellowing/Aging: Long-term sunlight, high temperature, chemical contact, or inferior silicone.
Silicone Damage/Wear: Insufficient silicone hardness, long-term friction/impact, or sharp object contact.

Usage: Check silicone layer integrity before use; avoid exceeding temperature range (-65℃ to 250℃) and load-bearing limit; avoid strong acid/alkali or organic solvents.
Cleaning: Wipe with a soft cloth; soak in warm water (≤60℃) for stubborn stains, scrub gently; avoid sharp objects and organic solvents; disinfect medical/food-related products as required.
Maintenance: Store in a cool, dry place; avoid sunlight and high temperature; clean and dry before long-term storage; regularly check for peeling/aging and repair/replace in time.

Adapt to Scenarios: Choose silicone-covered hardware for high strength/corrosion resistance; choose silicone-covered plastic for lightweight/cost-effectiveness.
Material Matching: Select LSR silicone and substrate meeting application requirements (e.g., medical-grade for medical products).
Quality and Brand: Prioritize certified (FDA, RoHS, ISO) regular brands; check for uniform coating, no peeling/bubbles, and intact substrate.
Customized Products: Confirm silicone hardness, coating thickness and bonding effect with manufacturers.

Injection silicone products covering hardware and plastic are key components in precision manufacturing, integrating silicone and substrate advantages. Their quality depends on material selection and processing technology. Correct usage, cleaning and maintenance extend service life, while reasonable selection ensures application stability and safety, improving equipment performance and reducing maintenance costs.