When selecting the molding process, silicone extrusion is often regarded as a mature and reliable option. Silicone materials have good temperature resistance, elasticity, and chemical stability. Based on these characteristics, silicone extrusion is widely applied in the medical, electronics, home appliances, automotive, and construction fields. If you want to learn more about silicone extrusion processes or customize silicone extrusion products, keep reading!
What Is Silicone Extrusion?
Silicone extrusion is also known as silicone extrusion molding. It is a process that uses the screw of an extruder to achieve continuous molding of silicone. Under the combined effect of temperature and pressure, it forms the desired profile structure through an extrusion die with a specific cross-section. Then, it undergoes heating and vulcanization to achieve its final shape. The silicone extrusion process has high production efficiency. It is often used in factories for the mass production of products such as silicone sealing strips, silicone tubes, and cable wrapping.
Materials of Silicone Extrusion
Silicone Base Materials
Silicone has liquid silicone and solid silicone. Liquid silicone is used for High-precision and complex-shaped products， such as protective covers for electronic components, and medical equipment accessories. Solid silicone is suitable for producing large-sized, simple-shaped products, such as silicone tubes, sealing strips, and gaskets. It is the most widely used material type in silicone extrusion molding.
Fillers And Addition Agents
Fillers and additional agents are used to enhance the physical properties of silicone, improve its processing performance, and reduce costs. Common Packing Materials Include SiO₂, CaCO₃, and Bauxite.
SiO₂ is the most commonly used filler; it can improve the strength, hardness, and wear resistance of silicone. It can also improve the flowability and stability of silicone.
CaCO₃ is generally used to reduce the cost of silica, improve the hardness and machinability of silicone materials.
Bauxite is used to improve the high-temperature resistance and wear resistance of silicone. Others, such as Talc and quartz powder, are used to adjust the properties of silicone according to different performance requirements.
Cross-Linking System:
The Cross-Linking System plays a key role in silicone extrusion. It directly affects the elasticity, strength, and heat resistance of silicone extrusion products. According to the type of silicone, we have a peroxide vulcanization system and an addition-type vulcanization system. They are usually used to achieve stable and reliable vulcanization molding.
Advantages of Silicone Extrusion
High Quality:
The silicone extrusion process has a precise mold design and an efficient temperature control system. So, its silicone extrusion products have a smooth and textured surface.
In general, we do not need secondary processing, and it also ensures consistency across all products in mass production.
Flexible Design:
Manufacturers typically have the freedom to adjust the cross-sectional shape, dimensions, tolerances, hardness, and functional structure of their silicone extrusion products. And it won’t significantly increase costs. This flexibility allows your product to be quickly prototyped in the early stages of development. This can also be a minor optimization according to actual needs during mass production.
High-Efficiency:
The silicone extrusion process can produce large quantities of standard-compliant silicone extrusion products in a short time. So, it is ideal for mass production.
Excellent Performance:
Silicone itself has elasticity, high temperature resistance, and UV resistance. This makes silicone extrusion products such as silicone LED neon lights，work stably at temperatures ranging from -50-200℃, and not easily deformed, softening, or becoming brittle. So, it is suitable for various extreme environments. Silicone has strong chemical resistance such as acids, alkalis, and oils. So they can be used stably for a long time in chemical contact environments.
Environmentally Friendly And Harmless:
Silicone extrusion products are not only safe and non-toxic, but also comply with various environmental regulations. So, it is always used in fields requiring high safety standards such as food, medical. They effectively ensure consumer health and safety. Silicone extrusion products are also a recyclable and biodegradable material, and cause no environmental pollution.
Cost-Effective:
Silicone extrusion has a lower production cost than injection molding and compression molding. This has high production efficiency. Silicone extrusion process molds are relatively easy and they can be used for a long time. It is Cost-friendly.
Application of Silicone Extrusion
Medical:
In the medical industry, silicone extrusion is mainly used to produce various types of tubing and flexible connection components. Silicone extrusion products have high safety standards and Long-term reliability. They are used in the manufacture of medical silicone tubing, catheter outer tubing, and infusion and breathing tubing assemblies.
Automobile:
With the advantages of high temperature resistance, aging resistance, and structural continuity, silicone extrusion products maintain stable performance under complex working conditions for a long time. So, they are usually used for engine compartment sealing strips, door and window sealing profiles, and wiring harness protective sleeves.
In automotive projects, sealing profiles, protective sleeves, exterior trims, and wheel-related upgrades all support durability and long-term replacement needs.
Electronics:
Silicone extrusion profiles can maintain reliable performance under high temperature, humidity, and long-term operating conditions. Common silicone extrusion products have cable insulating sleeves, electronic component protective sleeves, and waterproof and dustproof sealing profiles.
Food:
In the food industry, silicone extrusion is primarily used for conveying and sealing components. It meets food-grade regulatory requirements. Silicone extrusion products are odorless, non-leaching, and easy to clean. They are widely applied in food-grade conveying tubing, silicone tubing for coffee machines and water dispensers, and sealing strips for food equipment.
Construction:
Silicone extrusion products can achieve long-distance, seamless sealing structures. They can also effectively reduce leaks and improve overall reliability. Silicone extrusion is used in silicone sealing strips for doors and windows, sealing profiles for equipment housings, and waterproof and dustproof sealing strips.
Specialty Industries And Customized：
Silicone extrusion products can meet the needs of non-standard equipment and harsh working conditions with a targeted design of cross-sectional structure and material properties. They are usually used in special equipment, silicone parts for high-temperature or clean environments, and custom-shaped strips.
What Should Be Noted When Extruding Silicone?
Ratio：
First, you need to choose the right silicone system and make a reasonable ratio according to your product requirements. It is very important to use silicone extrusion products. If your product will be used in ovens or industrial heating equipment, you should choose the silicone system with more stable high-temperature resistance. This will help prevent the product from losing its properties at high temperatures and extend its service life.
The mixing ratio is an important factor in deciding your silicone extrusion products’ quality.
In general, Silicone accounts for 40-70% of the formulation. SiO₂ accounts for 10-60% and high-strength products may need to be increased to 70-80.CaCO₃ is generally used in combination with silicon dioxide, with an addition amount ranging from 5% to 30%. Crosslinking systems typically use 0.5% – 2.0%. But you need to adjust the specific ratio according to your product’s usage environment, performance requirements, and processing conditions.
Temperature:
During the silicone extrusion process, temperature needs to be precisely controlled. It ensures your silicone materials are plasticized and molded in the correct temperature range.
Mold Design:
The mold design is important for the molding effect. Depending on the shape of your products, the mold needs to be custom-designed. The size of the mold, the shape of the channels, and the design of the cooling system all affect the appearance and quality of the final product.
The dimensions of silicone extrusion products must precisely meet design requirements. For example, sealing strips and gaskets have high sealing requirements.
Tseting and Packaging:
You also need to test the physical properties, such as hardness, elasticity, and tensile strength. This ensures your products meet usage requirements.
Finally, qualified silicone extrusion products will be packaged to ensure they are not damaged during transportation. For some special applications (such as the medical and food industries), additional cleaning and disinfection procedures may be required.
Industrial Belts:
In industrial belt applications, silicone extrusion technology is mainly used to manufacture silicone profiles, silicone coatings, and customized belt surfaces for conveying and processing systems. Silicone materials provide excellent heat resistance, non-stick properties, flexibility, and product protection, making them suitable for demanding industrial environments.
Silicone extrusion products are commonly applied to silicone timing belts, silicone conveyor belts, and silicone-coated industrial belts used in food processing, packaging, electronics, and high-temperature production lines. The silicone surface improves grip performance, reduces product damage, and provides reliable conveying performance for delicate, sticky, or heat-sensitive materials.
Partner With A Trustworthy Supplier
Mature suppliers not only provide consistent and reliable raw materials and manufacturing capabilities but also participate in discussions on structure and material selection from the early stages of product development, helping you to mitigate potential manufacturing risks. For customized or long-term supply projects, this continuous and stable partnership helps reduce communication costs and subsequent maintenance risks, and also ensures the long-term reliability of the product in real-world usage environments.
FAQ:
1. What Are The Differences Between Silicone Extrusion, Injection Molding, And Compression Molding?
| Types | Advantages | Disadvantages |
| Compression molding | 1. Suitable for products with relatively complex structures and thick walls
2. High material utilization 3. Relatively simple mold structure
|
1. Low production efficiency 2.Limited dimensional accuracy
2. Unsuitable for long or continuous products |
| Silicone extrusion | 1. Suitable for large-scale, continuous production
2. Suitable for producing long, tubular, and simple cross-sectional products |
Complex shapes are difficult to achieve and are very sensitive to the environment (temperature and humidity) |
| Injection molding | Suitable for products with complex shapes and high precision requirements. | 1. The production cycle is relatively long
2 . Requiring more molds and process adjustments. |
2. What Types of Products Are Silicone Extrusion Processes Suitable For Producing?
The silicone extrusion process is mainly suitable for products with fixed cross-sectional shapes and cuttable lengths, such as silicone sealing strips, silicone hoses, dustproof strips, and waterproof strips.
3. Do Silicone Extruded Products Always Require Post-Vulcanization Treatment?
Not necessarily. Post-vulcanization mainly removes residues and improves product performance stability. In general, Post-vulcanization is unnecessary for industrial applications. If it is required for food-grade, medical-grade, or applications with stringent usage requirements.
4. What Is The Typical Range Within Which The Dimensional Accuracy of Silicone Extrusion Products Can Be Controlled?
Under the premise of stable process and reasonable mold design: Standard dimensional tolerance: ±0.1 mm ～ ±0.3 mm.
High-requirement products: Can be controlled within ±0.05 mm ～ ±0.1 mm (requires online monitoring and strict process control).
Final Thoughts：
If your project is evaluating silicone extrusion processes or you require customized, stable, and mass-producible silicone extruded products, please feel free to contact us. Legensilico will provide professional advice and feasible solutions based on your application scenario.
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