This LSR overmolded magnet protective sheath is manufactured by Xiangchu Rubber with liquid silicone injection molding process. It features firm bonding, excellent protection and good insulation performance. We support customization of hardness and size, and the product passes ISO 9001 certification with stable quality.
Material
Industrial LSR
Hardness
Shore A 30-70
Temperature
Certifications
Applications
-40°C ~ +200°C
Colors
Black, White, Transparent, Customizable
# LSR Overmolded Magnet Rubber Protective Sheath
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LSR overmolded magnet rubber protective sheaths are custom-molded components that fully encapsulate permanent magnetic cores in high-performance liquid silicone rubber (LSR), combining the magnetic functionality of the inner core with the superior physical and chemical properties of LSR. Designed to address common pain points of exposed magnets—including corrosion, mechanical impact damage, surface abrasion, and accidental magnetic adhesion to unintended metal components—our overmolded sheaths deliver reliable, long-lasting performance in demanding operating environments.
At Xiangchu (Hubei) Rubber Co., Ltd., located at No. 54, Neihe Lane, Fankou Sub-district, Echeng District Economic Development Zone, Ezhou City, Hubei Province, China, we specialize in custom LSR molding for industrial and consumer applications. Our LSR overmolded magnet sheaths are manufactured via precision liquid injection molding, ensuring a seamless, gap-free bond between the LSR outer sheath and the inner magnetic core that eliminates delamination under continuous use. We can produce custom sheaths to match your specific magnet dimensions, magnetic performance requirements, and application-specific environmental constraints, with consistent quality controlled through our ISO 9001-certified quality management system.
Unlike dip-molded or post-assembled rubber magnet covers, our overmolding process integrates the LSR and magnet core in a single production step, resulting in tighter dimensional tolerance and more reliable protection. This product line caters to low-volume prototype development and high-volume mass production, making it suitable for a wide range of project scales.
Our LSR overmolded magnet protective sheaths use food-grade or industrial-grade raw liquid silicone rubber as standard, paired with customer-specified or commonly available permanent magnet cores (neodymium iron boron (NdFeB), samarium cobalt (SmCo), alnico, and ferrite magnets are all compatible for overmolding). Key material properties are as follows:
*Note: Magnetic performance parameters are determined by the inner magnet core specifications. We can adjust magnet grade, size, and magnetic flux output to meet your application requirements.
Our production uses precision horizontal liquid injection molding, with controlled process parameters to ensure consistent product quality:
Exposed magnets are prone to chipping, cracking, and corrosion when exposed to moisture or harsh chemicals, which degrades magnetic performance over time. Our seamless LSR overmolding creates a fully waterproof, chemically resistant barrier that prevents oxidation and corrosion of NdFeB and other corrosion-prone magnet alloys, extending the service life of the magnetic component by 3–5 times compared to unprotected magnets. The elastic LSR outer layer also absorbs impact and vibration, reducing the risk of magnet breakage during handling and operation.
We support full customization of sheath dimensions, wall thickness, LSR hardness, and magnet specifications to match your application requirements. Our precision injection molding process maintains consistent dimensional tolerances even for complex geometries, such as curved profiles, through-holes, and mounting notches. Whether you need small, precision sheaths for consumer electronics or large overmolded magnets for industrial machinery, we can adapt our production to your design.
The LSR outer sheath has a low surface energy and non-abrasive texture that prevents scratching of contact surfaces, unlike exposed hard magnetic cores. It also provides excellent non-slip grip, making it ideal for handheld tools, mounting components, and consumer products that require secure handling. Unlike thermoplastic overmolding, LSR maintains its elastic and non-slip properties even at low temperatures, eliminating brittleness in cold operating environments.
We offer food and medical-grade LSR formulations that meet global regulatory requirements for indirect food contact and short-term skin contact, making our sheaths suitable for food processing equipment, medical devices, and consumer wellness products. The LSR material is non-toxic, odorless, and resistant to repeated cleaning and sterilization (autoclaving, alcohol wiping, and UV sterilization are all compatible).
LSR overmolded magnet rubber protective sheaths are used across a wide range of industries, with common use cases including:
LSR hardness can be adjusted based on your application requirements:
We offer two production options to meet different project needs:
Select the appropriate LSR grade based on your application:
At Xiangchu (Hubei) Rubber Co., Ltd., all production processes follow the requirements of our ISO 9001-certified quality management system, from raw material incoming inspection to finished product outgoing testing. Our quality control processes include:
For inquiries, custom development requests, or quotations, contact us at:
