Quality LSR Liquid Silicone Rubber & Food Grade Liquid Silicone Rubber manufacturer

Hardness is the first number most buyers quote when they request a liquid silicone rubber sample, and it is also the one most often chosen by habit rather than by calculation. Shore A 20 and Shore A 70 are the same chemistry, but they behave like different materials on the press, in the mould and in the hand. For manufacturers, hardness decides three things at once: how the part feels, how it releases from the cavity, and how much load it can carry before taking a permanent set. Getting it wrong usually shows up late — as flash, as tearing at the gate, or as a customer complaint about a seal that leaks after two months in service. How Hardness Changes Mechanical Properties The trade-off is not linear, and it is not intuitive. In the RUIHE 6250 standard food-grade range, moving from 20 to 70 Shore A raises tensile strength from 5 MPa to 9 MPa, but cuts elongation at break from 700% down to 350%. Tear strength moves the other way: 13 kN/m at 20 Shore A, up to 30 kN/m at 70 Shore A. That is the whole selection problem in one line. Soft grades stretch and recover; hard grades resist cutting and compression. You rarely get both in the same shot. Matching Hardness to the Part Shore A 20–30: teats, valves, spoon heads and soft-touch grips. These need high elongation and clean demoulding rather than strength. Shore A 40–50: the working range for general seals, gaskets and tubing, where compression set and tear have to be balanced. Shore A 60–70: structural parts, connectors and grommets that are assembled by force or hold a thread. Shore A 80: hard parts that still need elasticity, such as wear pads and load-bearing profiles. What Hardness Does Not Tell You Two grades at the same hardness can still perform completely differently. The 6250-HAB series runs the same 20–70 Shore A steps as the standard range but is formulated for higher clarity — around 82% light transmittance and 8% haze — so it can be used for visible parts. The 6450 series trades part of that clarity for colour consistency and higher strength. Cure behaviour matters just as much. Standard grades should be post-cured at 200 °C for 2–4 hours to drive off volatiles before food-contact use, while non-post-cure (FV) grades reach their final properties straight out of the mould with VOC below 0.35%. If your line has no oven, hardness alone will not tell you which grade fits. Selecting Within One Series Working inside a single series keeps processing stable. The RUIHE 6250 series covers 20 to 80 Shore A on the same platinum-cure platform, with matched rheology and cure speed, so a mould designed for one hardness can usually run the neighbouring step with only minor parameter changes. At GUANGZHOU RUIHE NEW MATERIAL TECHNOLOGY CO., LTD, we supply the 6250, 6350, 6450 and FV series with full TDS, MSDS, COA and FDA/LFGB documentation, and we adjust hardness, colour and cure system against a customer drawing.

Liquid Silicone Rubber (LSR) is a high-performance elastomer widely used across industries due to its exceptional purity, flexibility, and durability. As global demand grows for safe, stable, and precision-molded materials, LSR has become a preferred choice in medical, automotive, and consumer applications. As a professional manufacturer, GUANGZHOU RUIHE NEW MATERIAL TECHNOLOGY CO., LTD specializes in the R&D and production of high-quality LSR materials for global customers.   Core Features and Advantages of LSR LSR is a two-component, platinum-cured silicone material known for its excellent thermal stability, biocompatibility, and low compression set. It can withstand extreme temperatures ranging from -50°C to 200°C without losing its mechanical properties.   Key advantages include: High transparency and purity, ideal for medical and food-grade applications Excellent resistance to UV, ozone, and chemicals Low viscosity, enabling easy injection and precise molding Superior flexibility and elasticity, even in harsh environments Low volatile content (VOC), supporting environmentally friendly production   At GUANGZHOU RUIHE NEW MATERIAL TECHNOLOGY CO., LTD, our LSR products are engineered to meet strict international standards, ensuring consistent quality and performance.   Main Application Areas LSR is widely used in industries that require safety, precision, and durability: Medical devices: respiratory masks, catheters, valves, and seals Baby care products: nipples, pacifiers, and feeding accessories Automotive components: connectors, gaskets, and sensor housings Consumer electronics: keypads, wearable components, waterproof seals Kitchenware and food contact products: baking molds and sealing parts   With strong technical support and customized solutions, GUANGZHOU RUIHE NEW MATERIAL TECHNOLOGY CO., LTD helps customers develop reliable silicone solutions for diverse applications.   Manufacturing Process: Liquid Injection Molding (LIM) LSR is primarily processed using Liquid Injection Molding (LIM), an automated and highly efficient production method. In this process, two liquid components are precisely mixed and injected into a heated mold cavity.   Key benefits of LIM include: High precision and repeatability for complex geometries Short cycle times, improving production efficiency Minimal material waste, reducing overall costs Clean and closed system, ensuring product consistency and hygiene   GUANGZHOU RUIHE NEW MATERIAL TECHNOLOGY CO., LTD provides LSR materials optimized for LIM processes, enabling customers to achieve stable and efficient production.   Difference Between LSR and HCR (Solid Silicone Rubber) While both LSR and HCR (High Consistency Rubber) are silicone-based materials, they differ significantly in processing and performance: Form: LSR is liquid, while HCR is solid and gum-like Processing: LSR uses injection molding (LIM), whereas HCR is typically processed by compression or extrusion Efficiency: LSR offers higher automation and faster cycle times Precision: LSR is better suited for intricate and thin-walled designs Post-processing: HCR often requires secondary curing, while LSR generally does not Conclusion Liquid Silicone Rubber (LSR) stands out as a versatile and high-performance material that meets the evolving needs of modern industries. With its outstanding properties, efficient manufacturing process, and wide application range, LSR continues to drive innovation in medical, automotive, and consumer markets.   As a trusted supplier, GUANGZHOU RUIHE NEW MATERIAL TECHNOLOGY CO., LTD is committed to delivering advanced silicone materials, customized solutions, and reliable technical support to partners worldwide.

Silicone Expo Europe 2026 Review: Ruihe Showcases Innovation in Silicone Materials From February 24–25, 2026 (local time), Silicone Expo Europe 2026 successfully concluded in Europe. As a leading manufacturer of silicone materials, Guangzhou Ruihe New Material Technology Co., Ltd. actively participated in this international event, presenting a wide range of innovative silicone solutions. At the exhibition, Ruihe focused on core silicone material technologies, highlighting key product categories such as silicone rubber, silicone elastomers, and film-forming agents. The event provided an excellent platform for in-depth exchanges with global industry professionals, enabling us to explore new trends and applications in silicone materials while demonstrating the strength of Chinese manufacturing.   Comprehensive Product Coverage Across Key Industries During the expo, Ruihe showcased five major silicone product themes, covering diverse application fields including textiles, medical devices, consumer electronics, and personal care. 1. Liquid Silicone Rubber (LSR) Featuring excellent optical clarity, low VOC, high transparency, and durability, LSR is widely used in new energy, medical, and optical applications where performance consistency is critical. 2. Medical Grade Silicone Rubber Compliant with FDA and ISO 10993 standards, this material offers outstanding biocompatibility and stability. It is ideal for medical devices such as catheters, respiratory masks, and negative pressure drainage systems. 3. High Transparency Solid Silicone Rubber (HCR) Certified for food-grade applications, this material supports various molding processes. It is commonly used in kitchenware, sealing components, and soft-touch consumer products. 4. Textile Silicone Solutions Designed for high adhesion and abrasion resistance, these silicones enhance fabric coating and finishing performance. They are widely used in textile printing and functional fabric treatments. 5. Personal Care Silicone Materials Providing skin-friendly softness and excellent compatibility, these materials are suitable for skincare and cosmetic formulations, helping improve texture, spreadability, and overall sensory experience.       Spotlight Product: Silicone Film-Forming Agents A key highlight at the exhibition was Ruihe’s latest innovation—silicone film-forming agents, designed for advanced cosmetic applications. These products offer: Fast film formation with smooth and even application Breathable and non-sticky skin feel Improved durability and adhesion in cosmetic formulations Enhanced compatibility with pigments such as titanium dioxide and iron oxides Stable performance across various formulations, supporting customized solutions They are especially suitable for foundations, BB creams, and long-lasting makeup products, meeting the evolving demands of the global beauty industry.   Strengthening Global Partnerships As one of Europe’s most influential silicone industry exhibitions, Silicone Expo Europe brought together top companies, cutting-edge technologies, and innovative applications. Ruihe leveraged this opportunity to strengthen connections with international clients through face-to-face meetings and technical discussions, laying a solid foundation for future cooperation. Looking Ahead The successful participation in Silicone Expo Europe 2026 marks another important milestone for Ruihe. Moving forward, we will continue to focus on technological innovation, product quality, and customer-oriented solutions. Our mission is to provide high-performance silicone materials and contribute to the advancement of global industries. We sincerely thank all our partners and customers for their trust and support. Ruihe remains committed to delivering excellence and building long-term collaborations worldwide.     Contact Us Tel: +86 13421773611 WhatsApp/WeChat: +86 13421773611 Email: wendy@ruihesilica.com