Three Chinese LSR makers target rising demand for high-performance elastomers

By AI, Created 3:46 AM UTC, May 28, 2026, /AGP/ – A new comparison of three liquid silicone rubber manufacturers in China spotlights how suppliers are splitting into high-volume, prototyping and custom-engineering models as demand rises in automotive, medical and industrial markets. Longrun Rubber Products in Huizhou is positioned as the most integrated option for buyers that need precision, certification and long-term support.

Why it matters: - Demand for liquid silicone rubber is rising across automotive, medical, food processing and industrial applications. - LSR is used where purity, thermal stability and biocompatibility matter, especially in sealing and damping parts. - Buyers are increasingly choosing suppliers based on whether they need high-volume output, rapid prototyping or custom-engineered production.

What happened: - A comparison identified three Chinese LSR manufacturers: Longrun Rubber Products (Huizhou) Co., Ltd., Shenzhen Kangde Silicone Rubber Products Co., Ltd. and Dongguan Weifeng Silicone Rubber Products Co., Ltd. - Longrun Rubber Products, based in Huizhou, Guangdong, was presented as the most integrated custom LSR solutions provider. - Shenzhen Kangde was positioned as a high-volume specialist for consumer electronics and medical devices. - Dongguan Weifeng was described as a prototype-to-production partner for rapid development and medium-volume runs.

The details: - Longrun Rubber Products was founded in 2005 and employs about 120 staff, including a 20-engineer R&D team. - The Huizhou facility covers 10,000 square meters and has annual production capacity of USD 10,000,000. - Export sales account for 80% of Longrun’s business, with markets including the United States, Germany, Australia, the United Kingdom, France, Switzerland, Spain, Turkey, Canada, Italy, Mexico, Portugal and Russia. - Longrun holds ISO 9001:2015 and IATF 16949:2016 certifications from BSI for rubber and silicone seals. - Longrun’s product range includes O-rings, gaskets, seals, grommets, dampers and washers. - Longrun works with medical-grade silicone rubber, FKM, NBR and EPDM. - The company offers custom options for hardness, dimensions, color and physical properties. - Longrun says its parts are built for improved dimensional precision, better sealing and vibration damping, longer service life and stronger resistance to heat, oil, ozone and corrosion. - Longrun’s service model covers OEM and ODM custom rubber molded parts. - The company lists a 20-day lead time and 100% inspection before shipment. - Longrun components are used in automotive, industrial, energy, medical, food and electrical applications. - One cited customer case involved a five-year supply relationship in the US, with 3,000,000 units shipped per year, defect rate below 150 ppm and Cpk above 1.33. - Shenzhen Kangde was described as operating a 15,000 m² facility with more than 200 injection molding machines. - Kangde’s core strength is high-volume, cost-efficient production of standard parts such as keypads, gaskets and seals. - Dongguan Weifeng was founded in 2008 and focuses on rapid prototyping and medium-volume production. - Weifeng is described as able to move from concept to production within two weeks and offers FDA-approved grades. - LSR is described as having heat resistance up to 300°C, flexibility at low temperatures, biocompatibility and resistance to chemicals and UV.

Between the lines: - The three suppliers reflect a segmented market, not a one-size-fits-all industry. - Longrun is being framed around technical support, quality systems and customization rather than lowest cost. - Kangde appears aimed at standardized, automated production where speed and price matter more than complex engineering support. - Weifeng fits early-stage development work, where turnaround time and flexibility are more important than long-run scale. - The comparison suggests buyers in regulated or mission-critical sectors are being steered toward suppliers with stronger validation and inspection systems.

What’s next: - Buyers needing custom LSR parts are expected to keep weighing certification, tooling support, inspection standards and lead times alongside price. - Demand for precision molding suppliers is likely to remain tied to miniaturization and tighter tolerance requirements. - Longrun is positioned to pursue more long-term OEM projects that require global support and consistent quality control.

The bottom line: - China’s LSR market is splitting into three clear lanes: mass production, rapid prototyping and custom high-spec manufacturing.