Liquid Silicone Rubber Injection MoldingPublished on May 30, 2026
This LSR overmolded ceramic protective sheath is manufactured by Xiangchu Rubber. It adopts integrated injection molding process, with firm bonding and no cracking, good buffering, impact resistance and insulation. We support customization of color, hardness and size to meet the protection needs of multiple industries.
Material
Industrial LSR
Hardness
Shore A 30-70
Temperature
-40°C ~ +200°C
Colors
Black, White, Transparent, Customizable
Certifications
ISO 9001
Applications
It can be used for industrial equipment parts protectionelectronic ceramic parts insulation protectionand buffer protection of components in high temperature environmentprotect ceramic parts ...
Liquid Silicone Overmolded Ceramic Protective Sheath is a custom-engineered protective component produced by 橡楚（湖北）橡胶有限公司, designed to address the inherent brittleness and low impact resistance of ceramic structural parts while retaining the excellent high-temperature performance, insulation, and corrosion resistance of ceramic substrates.
This product integrates precision injection overmolding technology with high-purity food-grade or industrial-grade liquid silicone rubber (LSR) to form a permanent, gap-free bond between the LSR outer layer and the inner ceramic core. The outer silicone sheath absorbs mechanical impact, disperses concentrated stress, and effectively prevents edge chipping, cracking, or complete fracture of the ceramic part during handling, installation, and long-term operation. At 橡楚（湖北）橡胶有限公司, we manufacture these protective sheaths at our facility located at 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, with controlled production processes that meet consistent quality requirements for global industrial and consumer applications.
Unlike post-assembled silicone covers that rely on mechanical fitting or adhesive bonding, our overmolded design eliminates gaps between the silicone sheath and ceramic core, preventing the ingress of dust, moisture, and corrosive media. This integrated structure also delivers improved ergonomic handling, enhanced grip, and reliable insulation performance that cannot be achieved by unprotected ceramic parts.
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Technical Specifications
Material Properties
ParameterSpecification
Inner CoreHigh-purity alumina (Al₂O₃), zirconia (ZrO₂) ceramic, or custom ceramic materials per customer requirements
Silicone Purity≥99.5% raw silicone content, free of heavy metal additives and phthalates
Bonding TypeCovalent chemical bonding between LSR and ceramic, no intermediate adhesive layer
Temperature Resistance-40°C to 200°C (continuous operation); short-term peak resistance up to 250°C
Chemical ResistanceResistant to dilute acids, dilute alkalis, common organic solvents, and hydraulic fluids
Insulation Strength≥20 kV/mm for the silicone sheath layer
Physical Performance
ParameterTypical ValueTest Method
Silicone Shore Hardness30A to 70A (customizable)ASTM D2240
Tensile Strength of Silicone4.0 MPa to 8.5 MPaASTM D412
Elongation at Break300% to 700%ASTM D412
Tear Strength15 kN/m to 35 kN/mASTM D624
Bonding Strength Between LSR and Ceramic≥1.2 MPaPull-off test
Impact Resistance8 to 12 times higher than unprotected ceramic partsDrop weight impact test
Compression Set (200°C, 22h)≤18%ASTM D395
Process Parameters
Process StepControlled Range
Ceramic Surface PretreatmentPlasma cleaning + primer treatment, surface roughness Ra 0.8 μm to 1.6 μm
LSR Injection Temperature160°C to 180°C
Molding Pressure5 MPa to 10 MPa
Curing Time30s to 120s (adjusted based on sheath thickness)
Post-Curing4 hours at 150°C to eliminate residual volatile compounds
Dimensional Tolerance±0.05 mm for outer sheath; ±0.02 mm for inner ceramic core
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Product Advantages
Permanent Gap-Free Bonding for Enhanced Durability
Our LSR overmolding process forms a direct chemical bond between the silicone sheath and ceramic core, eliminating the gaps and adhesive degradation issues common to post-assembled protective covers. This bond resists delamination even after long-term thermal cycling and mechanical vibration, extending the service life of the ceramic component by 3 to 5 times compared to unprotected alternatives.
Customized Performance Matching for Specific Application Requirements
We can adjust the Shore hardness, thickness, and outer contour of the silicone sheath to meet different functional needs. Soft low-hardness sheaths deliver excellent shock absorption for handheld devices, while high-hardness sheaths provide enhanced wear resistance for industrial mechanical components. We also offer custom material grades to comply with food contact, medical, or industrial application standards.
Retains Core Advantages of Ceramic Materials
The thin LSR protective sheath does not affect the high-temperature resistance, insulation, and corrosion resistance of the inner ceramic core. It only improves the impact resistance and handling performance of the ceramic part, allowing customers to leverage the benefits of ceramic materials without the risk of brittle fracture.
Controlled Production Process and Stable Quality
All production is carried out at our facility in 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, with raw material incoming inspection and finished product performance testing at every production stage. Our production system is certified to ISO 9001, ensuring consistent dimensional accuracy and performance across all production batches.
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Applications
Liquid Silicone Overmolded Ceramic Protective Sheaths are suitable for a wide range of industrial and commercial applications that require the performance of ceramic materials with improved mechanical durability:
Household and Kitchen Utensils: Protective sheaths for ceramic blade cores of kitchen knives, ceramic peeler handles, and ceramic tableware components. The LSR outer layer improves grip comfort, prevents chipping during daily use, and meets food contact safety requirements.
Electronics and Electrical Insulation: Protective components for high-voltage ceramic insulators, ceramic sensor cores, and high-temperature ceramic heating elements. The silicone sheath provides additional insulation protection and prevents damage to the ceramic core during installation and maintenance.
Medical Devices: Protective overmolding for ceramic surgical instrument components, dental ceramic parts, and diagnostic equipment ceramic cores. We can provide material grades that meet basic biological safety requirements for non-implantable medical applications.
Industrial Mechanical Components: Protective sheaths for ceramic pump shafts, seal rings, and valve components used in corrosive fluid processing. The silicone sheath absorbs vibration and reduces impact damage to the ceramic core, while maintaining the ceramic's corrosion resistance.
Consumer Goods: Protective covers for ceramic jewelry cores, ceramic handicrafts, and outdoor tool ceramic components, improving impact resistance and drop damage resistance.
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Selection Guide
Hardness Selection
Shore 30A to 40A: Recommended for applications requiring high shock absorption and soft touch, such as handheld tool handles, kitchen utensil grips, and wearable device components.
Shore 40A to 55A: General purpose grade, suitable for most industrial insulation components, pump shaft seals, and electronic sensor protection, balancing shock absorption and structural stability.
Shore 55A to 70A: Recommended for applications requiring high wear resistance and compression resistance, such as high-load mechanical components and high-frequency vibration working environments.
Size Specifications
All our Liquid Silicone Overmolded Ceramic Protective Sheaths are custom manufactured based on customer drawings and sample requirements. We support production of inner ceramic core diameters ranging from 5 mm to 200 mm, and silicone sheath thickness ranging from 0.5 mm to 5 mm to meet different installation and performance requirements. For oversized or geometrically complex ceramic parts, please contact our technical team for feasibility evaluation.
Material Grade
Food Contact Grade: Uses food-grade LSR raw materials that comply with FDA 21 CFR 177.2600 standards, suitable for kitchen utensils, tableware, and food processing equipment components.
Industrial Grade: General industrial LSR, suitable for insulation, mechanical protection, and general corrosion-resistant applications, with a more cost-effective price point.
Low Volatile Grade: Post-curing treatment to reduce residual volatile organic compounds, suitable for closed electronic systems and high-purity processing environments.
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Quality Assurance
All Liquid Silicone Overmolded Ceramic Protective Sheaths produced by 橡楚（湖北）橡胶有限公司 are manufactured under a quality management system certified to ISO 9001, with full traceability from raw material incoming inspection to finished product outgoing inspection. Our quality control process includes: 100% dimensional inspection to confirm compliance with customer tolerance requirements; visual inspection to check for surface defects and bonding integrity; regular performance testing of silicone hardness, tensile strength, and bonding strength per batch.
We do not exaggerate product performance, and we provide clear technical parameters and sample evaluation for customers to verify performance before mass production. For customized products, we provide pre-production sample confirmation to ensure that product size, hardness, and structure meet customer requirements.
For inquiries, sample requests, or custom product quotations, please contact us at:
Phone: +86 18071171144
Email: churubber@163.com
Address: No. 54, Neihe Lane, Fankou Street, Economic Development Zone, Echeng District, Ezhou City, Hubei Province, P.R. China
