If you are looking for a heat and corrosion-resistant material, silicone injection moulding is an excellent choice. This process is currently used for a wide range of applications, including aerospace, automotive, medical and electronic parts. If you are interested in silicone injection moulding or require custom silicone products, this will explain its advantages in more detail below.
What is Silicone Injection Molding?
In silicone injection moulding, liquid silicone is injected into a precision mould and allowed to cure using heat. During this process, the silicone molecules undergo a cross-linking reaction that increases the material’s strength and durability, enabling the finished product to meet complex design requirements. This process is particularly well-suited to parts requiring high precision and complex designs, such as medical devices and automotive components.
Moreover, silicone injection moulding is highly efficient, making it ideal for mass production of items such as seals for medical devices, which often require precise dimensions and resistance to high temperatures and corrosion. With silicone injection moulding, thousands of identical parts can be produced in a matter of minutes, all of which meet quality standards. This is why many manufacturers choose it for mass production.
Types of Silicone Injection Molding
| Types | Features | Advantages | Disadvantages |
| Single-Material Injection | raw materials | 1. Easy operation 2. High efficiency, 3. suitable for mass production, 4. simple maintenance | Inability to combine multiple materials, limiting the variety of materials |
| Insertion moulding | Other materials injected into silicone | 1. Can be combined with different materials for customisability 2. Strong product performance | Complex production process and relatively high cost |
|
Double Injection
| Mixed two materials | Use a combination of both materials to improve product functionality | High cost and difficult process |
Different production processes can provide customers with various customized silicone solutions to meet the manufacturing needs of different types of silicone products.
The Process of Silicone Injection Molding
Suitable LSR
Silicone has different properties, such as hardness and heat resistance. You need to choose the appropriate material according to your product’s detailed requirements. Then, you need to mix the liquid silicone rubber and the curing agent in a certain proportion. The usual standard ratio is 100:1 (silicone rubber: curing agent). When mixing, remember to stir evenly to avoid air bubbles. Only in this way can the quality of the final product be ensured.
Mold
It is very important to design the silicone mold in advance and ensure that every detail is precise, as it determines whether the shape and precision of your later product meet the standards. Special attention should be paid to choosing materials suitable for the high-temperature resistance and chemical resistance of silicone to ensure the functionality and stability of the final silicone products. Before injecting silicone, remember to heat the mold to an appropriate temperature, usually 150 to 200 degrees Celsius. This can enable the silicone to cure more quickly, thereby enhancing your overall production efficiency.
Injection of Silicone
This step requires injecting the silicone into the mold. During the injection, it is essential to control the pressure and speed well. This is to ensure that the silicone can be evenly distributed to every corner of the mold, resulting in a better product effect. However, you should be aware that during the injection process, you should not apply too much pressure or inject at too fast a speed, as this may have a certain impact on the molding quality. Therefore, usually, before production, we will conduct parameter debugging to ensure that the injection process is completed smoothly and accurately.
Curing Process
After the silicone injection mold, you can start heat curing. Silicone has the best characteristics from 150-200℃.It becomes rigid and elastic. The time is about a few minutes. But the specific times are determined by the product’s thickness, structure, and characteristics.
Cooling And Demolding
This step is cooling and demolding. After the silicone is cured, you should let it cool to room temperature. This makes sure it is not to be deformation. This time is also decided by the product size and thickness. Usually not too much time. For example, the small sealing ring needs to be cooled for 2-3 minutes, the silicone gasket with medium thickness needs to about 5-10 minutes.
Post-Processing And Testing
After demolding, you should make a detailed testing process. First, to observe the surface of products. If it has a glitch, clean it with tools. Make sure the surface is smooth. Then, test the size and exterior of the silicone products. At last, make some performance tests, such as the hardness test and high temperature resistance test.
Packaging And Delivery
Once the silicone products pass the test, you can package them. To avoid damage, pay attention to protection when packaging. If all tests are finished, the silicone products can be given to customers or begin the next production link.
The Application of Silicone Injection Moldin
Silicone injection-moulded products have high temperature resistance. They can be used from -50-200℃. Whether in cold winter or hot summer， they can also keep a stable performance. In other words, your silicone products can be used for a long time in various weather conditions. Silicone has super flexibility and durability. Even though they use it how many times, they will not be out of shape or lose effectiveness. They also have high corrosion resistance, so they are not easy to be damaged. Finally, they are Non-toxic and harmless. It is very friendly to both humans and the environment.
FAQ：
1. What Should Be Noted During The Silicone Injection Molding Process?
Common problems include bubbles appearing, incomplete cuing, dimensions that are not precise, and impurities. To avoid these problems, we need to be prepared before production. We should adjust the injection pressure, curing temperature, and control. Ensure each step proceeds smoothly. Guarantee the quality of silicone products.
2. What Advantages Does Silicone Injection Molding Have Over Other Molding Processes?
Silicone injection molding is very accurate, so this craft can make complex shapes and high-precision silicone products. It is also suitable for mass production, because it has high production efficiency. Silicone has temperature, chemical resistance ability and good biocompatibility. Maintain performance under various extreme environments. These characteristics make it useful in many industries, such as healthcare and automotive.
3. What Is The Cost of Silicone Injection Molding?
The cost of silicone injection molding is determined by your need for a custom silicone product. You want to use what materials and quantities. Generally, the more you produce, the lower the cost per unit. However, if you are making some particularly complex customized products, you may need to invest more money at the beginning.
Final Thoughts：
If you’re looking for a durable and safe solution, silicone injection molding is definitely a reliable choice. Contact Legensilico now to customize your own silicone products. Enhance your product quality and meet the needs of various industries.
