Made of food-grade liquid silicone rubber via injection molding, it features excellent dustproof, waterproof and scratch-resistant performance, fits various USB ports such as Type-A and Type-C, has good elasticity without easy deformation, is easy to install and remove, and effectively extends the service life of electronic device ports.
Material
Food-grade LSR
Hardness
Shore A 30-50
Temperature
Certifications
Applications
-40°C ~ +200°C
Colors
Black, White, Transparent, Customizable
# Food-grade Liquid Silicone USB Port Dustproof Waterproof Protective Cap
Our Food-grade Liquid Silicone USB Port Dustproof Waterproof Protective Cap is a high-precision, high-durability accessory engineered to safeguard standard USB-A, USB-C, Micro-USB, and Mini-USB interfaces from environmental damage during storage, operation, and transportation. Manufactured via injection molding with medical/food-grade liquid silicone rubber (LSR), this product combines tight dimensional tolerance, non-toxic material composition, and long-term wear resistance to meet the needs of consumer electronics, industrial equipment, food processing systems, and medical device applications.
Unlike rigid plastic or low-solid rubber alternatives, this LSR USB protective cap features a micro-tapered interference fit design that creates an airtight seal without scratching port housings or internal contact pins. The integrated pull-tab design allows for tool-free removal and installation, while the matte non-slip surface ensures reliable handling even with wet or gloved hands. Core selling points include full compliance with global food contact safety regulations, IP67-rated ingress protection when properly installed, a service life of over 5,000 insertion/removal cycles, and wide operating temperature range suitable for extreme indoor and outdoor environments. The product is available in custom colors, hardness grades, and branding options to match specific device design requirements.
All protective caps are formulated with high-purity platinum-cured liquid silicone rubber, free of BPA, phthalates, PVC, and toxic heavy metals. Key material properties include:
The cap’s physical characteristics are optimized for long-term reliability in harsh operating conditions:
All caps are manufactured to precision tolerances for consistent fit across all standard USB port specifications:
Unlike generic silicone or plastic USB caps, our product is formulated with food-contact-grade LSR that meets strict global regulatory requirements for direct contact with food, beverages, and even skin/mucosa. This makes it suitable for use on USB ports of smart kitchen appliances, portable water filtration systems, and portable food temperature loggers, with no risk of harmful substance leaching even when exposed to high temperatures or oily food residues.
The micro-tapered interference fit design, combined with LSR’s low compression set, ensures an airtight seal that remains consistent even after thousands of insertion/removal cycles. The IP67 ingress protection rating prevents dust, liquid splashes, rain, and even temporary immersion from damaging internal USB contact pins, reducing port corrosion and signal failure rates by 92% compared to unprotected ports in field tests. Unlike rigid plastic caps that crack or lose their fit after repeated use, our LSR caps retain their shape and sealing performance for the entire service life of the device.
With an operating temperature range spanning -40°C to 200°C, this cap is suitable for extreme environments where conventional rubber or plastic alternatives fail. It remains flexible in low-temperature outdoor winter environments (no cracking or brittleness) and does not deform or emit odors when used on high-temperature industrial equipment or kitchen appliances. The UV-resistant formula also prevents discoloration and degradation when used on outdoor devices such as solar chargers, security cameras, and agricultural monitoring sensors.
The soft, flexible LSR material will not scratch metal port housings or bend internal contact pins during installation, unlike hard plastic caps that often cause permanent port damage. The integrated 3mm pull-tab design allows for quick removal and installation with one hand, even when wearing work gloves or wet hands, while the matte non-slip surface prevents accidental dropping during handling. Custom lanyard hole options are available to attach the cap to the device, eliminating the risk of loss during frequent port use.
Ideal for protecting USB ports on smartphones, laptops, power banks, wireless earbud charging cases, portable cameras, and outdoor speakers. The food-safe material is particularly well-suited for smart water bottles, electric lunch boxes, portable blenders, and other kitchen electronics that come into contact with food and beverages. The IP67 rating ensures these devices remain functional even when exposed to rain, spills, or dust during outdoor travel or daily use.
Used to seal USB ports on PLC programming interfaces, industrial sensors, data loggers, and factory automation equipment during storage, transportation, and equipment downtime. The wide temperature range and chemical resistance allow it to withstand exposure to cutting fluids, cleaning agents, and extreme workshop temperatures, preventing port corrosion and costly downtime caused by damaged communication interfaces. The flame-retardant UL 94 V-0 grade option is suitable for use on high-voltage industrial equipment and explosion-proof devices.
Meets food contact regulations for use on USB ports of smart kitchen appliances, commercial food temperature monitors, beverage dispensing equipment, and food packaging machinery. The non-porous LSR surface is easy to clean and resistant to bacterial growth, making it suitable for use in food processing facilities where strict hygiene standards are required. It can withstand regular high-temperature sanitization cycles without deforming or losing its seal.
The biocompatible, non-irritating LSR formulation is suitable for protecting USB ports on portable medical monitors, patient diagnostic equipment, wearable health trackers, and medical disinfection devices. It can withstand exposure to medical disinfectants such as alcohol and chlorine-based cleaners without degrading, and the non-toxic material eliminates the risk of adverse reactions when used on patient-facing devices.
Select the size matching your port type:
Custom sizes are available for non-standard USB or proprietary port designs upon request.
All our Food-grade Liquid Silicone USB Port Dustproof Waterproof Protective Caps are manufactured in ISO 9001, ISO 13485, and IATF 16949 certified facilities, with strict quality control processes implemented at every stage of production:
