Liquid Silicone Rubber Molding: Weather resistance from -50°C to 200°C + Food-grade certification enables faster production of complex structural components.
author: mia
2025-07-10
It has good thermal stability, heat aging resistance and weather resistance. It can be used for a long time in the temperature range of - 50℃ to 200℃. It is also resistant to ultraviolet rays and ozone, and has a long service life.
Liquid Silicone Rubber Molding: Versatility, Performance, and Applications
Table of Contents
Introduction to Liquid Silicone Rubber Molding
In the realm of manufacturing, liquid silicone rubber (LSR) molding has emerged as a game-changing technology, revolutionizing the production of high-performance components. This advanced process involves injecting liquid silicone rubber into precision molds, where it cures under heat and pressure to form durable, flexible parts with intricate designs.
What sets LSR molding apart is its unique combination of material properties and manufacturing efficiency. From extreme temperature resistance to compliance with strict safety standards, LSR components have become indispensable in a wide range of industries, driving innovation and enhancing product reliability.
Key Advantages of Liquid Silicone Rubber Molding
Exceptional Weather Resistance
One of the most remarkable features of LSR molded products is their outstanding weather resistance, operating flawlessly in temperatures ranging from -50°C to 200°C. This broad thermal stability makes them ideal for applications exposed to harsh environmental conditions, including extreme cold, intense heat, UV radiation, and moisture.
Unlike many other materials that become brittle in freezing temperatures or degrade under high heat, LSR maintains its elasticity and mechanical properties, ensuring long-term performance and durability. This resilience significantly reduces maintenance costs and extends the lifespan of products in outdoor, automotive, and industrial settings.
Food-Grade Certification
Safety is paramount in industries involving contact with food, beverages, or pharmaceuticals, and LSR excels in this area. Food-grade LSR is formulated to meet rigorous regulatory standards, such as FDA (Food and Drug Administration) and EU 10/2011, ensuring it is non-toxic, odorless, and resistant to chemical leaching.
This certification makes LSR molded components perfect for use in food processing equipment, kitchen utensils, baby products, and medical devices. The material's inert nature prevents contamination, and its smooth surface is easy to clean and sterilize, further enhancing its suitability for hygiene-critical applications.
Rapid Production of Complex Components
LSR molding offers significant advantages in terms of production speed and design flexibility. The liquid nature of the material allows it to flow easily into even the most intricate mold cavities, capturing fine details with precision. This capability enables the production of complex structural components in a single manufacturing step, eliminating the need for assembly and reducing production time.
Additionally, the curing process of LSR is relatively fast, allowing for high-volume production with short cycle times. Manufacturers can achieve consistent quality across large batches, making LSR molding a cost-effective solution for both small-scale prototypes and mass-produced parts.
Liquid Silicone Rubber Molding Parameters
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Parameter
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Typical Range
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Description
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Temperature Resistance
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-50°C to 200°C
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Maintains physical properties within this range; some formulations can withstand higher temps.
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Hardness (Shore A)
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10 to 80 Shore A
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Measures the material's resistance to indentation; lower values indicate greater flexibility.
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Tensile Strength
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3.5 to 8 MPa
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Maximum stress the material can withstand before breaking.
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Elongation at Break
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200% to 600%
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Percentage increase in length before the material fractures.
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Compression Set
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< 10% (at 200°C for 22 hours)
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Measures the ability to return to original shape after compression; lower values are better.
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Cure Time
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10 to 60 seconds
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Time required for the material to fully cure in the mold, depending on part thickness and temperature.
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Mold Temperature
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150°C to 200°C
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Optimal temperature range for curing LSR in the mold.
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Injection Pressure
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5 to 50 bar
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Pressure applied to inject LSR into the mold cavity.
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Food-Grade Compliance
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FDA, EU 10/2011
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Meets safety standards for contact with food, beverages, and pharmaceuticals.
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Industrial Applications of Silicone Rubber Molding
In the industrial sector, silicone rubber molding plays a vital role in numerous applications. In the automotive industry, LSR components are used in gaskets, seals, O-rings, and ignition system parts, thanks to their heat resistance and durability. They help prevent fluid leaks, reduce vibration, and withstand the high temperatures under the hood.
Aerospace manufacturers rely on LSR molded parts for their ability to perform in extreme conditions, such as in aircraft engines and cabin seals. The material's resistance to ozone and UV radiation also makes it suitable for outdoor industrial equipment, including sensors, connectors, and protective covers.
In the electronics industry, LSR is used for encapsulation and insulation of sensitive components, providing protection against moisture, dust, and temperature fluctuations. Its electrical insulation properties ensure reliable performance in wiring, connectors, and LED lighting systems.
Everyday Life Applications
Silicone rubber molding has a profound impact on our daily lives, with products ranging from household items to personal care devices. Kitchen tools such as spatulas, baking mats, and food storage containers often use LSR for its heat resistance and non-stick properties.
Baby products, including bottle nipples, pacifiers, and teething toys, benefit from LSR's safety and softness. In healthcare, LSR is used in medical tubing, syringe gaskets, and hearing aid components, where biocompatibility and precision are essential.
Even in sports and fitness, LSR molded parts can be found in items like swim caps, watch straps, and grip handles, offering comfort, flexibility, and durability for everyday use.
Expert Insights on Silicone Rubber Molding
"Liquid silicone rubber molding has transformed the way we design and manufacture complex components," says Dr. Emily Rodriguez, a materials science expert with over 15 years of experience in the polymer industry. "Its unique combination of thermal stability, biocompatibility, and processability makes it a material of choice for innovative products across multiple sectors."
Dr. Rodriguez emphasizes the importance of proper mold design in maximizing the benefits of LSR molding: "The key to achieving high-quality parts is to ensure the mold is optimized for the flow properties of LSR. This includes careful consideration of gate placement, venting, and cooling channels, which can significantly impact cycle time and part performance."
Another industry expert, Johnathan Chen, a manufacturing engineer specializing in injection molding, adds: "LSR's ability to produce complex geometries in a single step has reduced production costs and improved product reliability for our clients. We've seen a growing demand for food-grade and medical-grade LSR components, driven by increasing consumer awareness of safety and quality."
Frequently Asked Questions (FAQs)
Q: What is the difference between liquid silicone rubber (LSR) and solid silicone rubber?
A: LSR is a two-part liquid that cures to a solid when heated, while solid silicone rubber is a pre-formed elastomer that is molded under pressure. LSR offers better flow properties, allowing for more complex designs, and has faster curing times, making it more suitable for high-volume production.
Q: Can LSR molded parts be colored?
A: Yes, LSR can be colored using special pigments that are compatible with the material. The pigments are mixed into the liquid silicone before molding, ensuring uniform color distribution throughout the part.
Q: How long do LSR molded products last?
A: LSR has excellent durability and can last for many years, even in harsh environments. Its resistance to heat, UV radiation, and chemicals helps prevent degradation, making it a long-lasting material for both industrial and consumer products.
Q: Is LSR recycling possible?
A: While LSR is not easily recyclable in the traditional sense, scrap material from the molding process can often be reused in non-critical applications. Research is ongoing to develop more effective recycling methods for LSR.
Q: What industries benefit most from LSR molding?
A: The automotive, medical, food processing, consumer goods, and aerospace industries are among the biggest beneficiaries of LSR molding, thanks to the material's unique combination of properties and performance.
Dongguan Sanlixin Plastic Technology Co.,Ltd
Shenzhen Sanlixin Technology Co., Ltd. and Dongguan Sanlixin Plastic Technology Co., Ltd. is a manufacturer integrating precision plastic mold design, mold opening, single (double) color injection molding, IML injection molding processing, producing various single (double) color, IML process high-end appearance decorative structural parts, two-color buttons, USB dust plugs, panels and other plastic products, providing customers with fast, excellent, Midea all-round service, the company has 15 years of experience in precision plastic mold design, processing and production, with a variety of advanced machine injection molding equipment with excellent quality and fast service to win the trust and strong support of our customers.
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