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In the modern manufacturing landscape, material performance dictates engineering limits. Liquid Silicone Rubber (LSR), specifically formulated for high elasticity, stands as the premium standard for elastomeric parts requiring prolonged mechanical integrity under harsh environments.
Shandong Boctok Chemical Co., established in 2012, has grown to become a cornerstone of organosilicon technology and specialty chemical formulations. By recording over US$280 million in sales in 2023, Boctok has consolidated its status as a trusted, high-volume supplier of silicone polymers, specialized silanes, hydrocarbon petroleum resins, and agricultural intermediates.
Through state-of-the-art synthetic pathways and precision manufacturing setups based in China, we service international markets including Russia, North America, Europe, APAC, and South America. Our integrated manufacturing infrastructure and raw material agreements guarantee consistent product chemistry and high volume security.
Understanding the molecular dynamics and mechanical behaviors that enable exceptional return-to-shape and tensile capabilities.
High Elasticity Liquid Silicone Rubber derives its performance properties from its distinct polymer structure. Normal addition-cure (platinum-catalyzed) LSR uses a two-part formulation where vinyl-functional polydimethylsiloxane (PDMS) networks crosslink with methyl-hydrogen siloxanes. By adjusting the molecular weight distribution of the vinyl-terminated linear chains and optimizing the crosslink density, engineers can maximize tensile strength, tear resistance, and elongation-at-break.
Silica reinforcement plays an indispensable role. Highly dispersed fumed silica (hydrophobic treated) is incorporated to act as physical reinforcement points. This prevents propagation of micro-tears under dynamic mechanical stress. This formulation choice gives our LSR compound superior compression set performance, allowing parts to retain sealing loads over thousands of hours of operation.
To achieve exceptional coupling between the silicone matrix and external structural elements (such as metal inserts or thermoplastics in multi-shot molding), our 12 series of silane coupling agents—including aminosilanes, epoxy silanes, and vinyl silanes—provide critical adhesion promoters.
| Typical Properties | Unit | Standard Range (Low-Mid Durometer) | High Elasticity Formulation Range | Testing Method |
|---|---|---|---|---|
| Hardness | Shore A | 30 - 70 | 40 - 80 | ASTM D2240 |
| Tensile Strength | MPa | 6.5 - 9.0 | 9.5 - 11.5 | ASTM D412 |
| Elongation at Break | % | 300 - 550 | 600 - 850 | ASTM D412 |
| Tear Strength | kN/m | 15 - 30 | 38 - 52 | ASTM D624 Die B |
| Compression Set (22h @ 175°C) | % | 15 - 25 | 8 - 12 | ASTM D395 Method B |
From advanced automotive drivetrains and pharmaceutical processing lines to agrochemical production and resilient industrial coatings.
High Elasticity LSR is critical for cable connector seals, wire harnesses, battery compartment gaskets, and EV cooling system couplers. It withstands temperature fluctuations from -50°C to +200°C while resisting ozone and weathering.
Our biocompatible LSR formulations are inert, non-reactive, and sterilizable via autoclave, ETO, or gamma radiation. Perfect for respiratory valves, infusion pumps, diagnostic septums, and self-lubricating seal rings.
Waterproof keypads, micro-seals, dynamic acoustic diaphragms, and skin-contact safe smartwatch bands. The high elasticity prevents deformation under repeated keystroke or flex loading cycles.
Boctok invests directly in China hydrocarbon resin plants (Zibo, Fushun, Nanjing). C5, C9, and modified petroleum resins act as tackifiers in industrial adhesives, marine paints, road marking formulations, and rubber compounds.
Alongside silicone chemistry, Boctok delivers high-grade raw chemical components used in synthesizing crop protection products, fungicides, herbicides, and plant growth regulators to agricultural markets globally.
Analyzing procurement requirements, logistics dynamics, and manufacturing scaling for international volume buyers.
Industrial procurement agents and global material managers look for three primary indicators when evaluating an LSR supplier: chemical consistency, scaling capacity, and trade compliance. Given the dynamic regulatory landscapes across Europe, North America, and Russia, procurement models must prioritize partners with robust localized operations and regulatory clearances (such as REACH, TSCA, and ROHS compliance).
The global demand for high elasticity polymers is climbing due to the transition to clean energy (EV seal components) and automated medical assemblies. To secure this growth, Boctok recently completed a massive US$65 million capital investment to construct a new silane synthesis plant located in Bohai Industrial Park (Shouguang City, Shandong Province). This modern facility expands the production chain of silane coupling agents, deploying 6 fully automated DCS production lines with an annual output capacity of 30,000 tons.
By controlling the core silane crosslinker and monomer supply chains internally, Boctok mitigates raw material price volatility and quality drifts that typically affect secondary compounders.
Our commitment to continuous innovation in polymer synthesis, green chemistry, and custom formulation engineering.
Technical guidance and material answers from Boctok's engineering and quality assurance departments.
Explore our secondary tier of functional coupling agents, siloxanes, and specialty agricultural chemical ingredients.
Boctok Chemical