Liquid Injection Molding

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Liquid Injection Molding, Silicone Products Top Manufacturer in China

Liquid injection molding (LIM), or Liquid Silicone Rubber (LSR) injection molding, is a highly specialized manufacturing process that involves injecting liquid silicone rubber into a mold cavity to create a finished part. This process is particularly effective for creating parts with complex geometries, tight tolerances, and high precision. 

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Liquid Injection Molding Silicone Products

Liquid Silicone Rubber Injection Molding Process

The process begins with the preparation of the liquid material, which is typically a two-part silicone or rubber compound. These materials are mixed together in a precise ratio and then loaded into a specialized liquid injection molding machine.

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The liquid injection molding machine heats the material to a specific temperature and then injects it into the mold cavity under high pressure. The molding temperature is normally around 110-130°C. Once the material has been injected into the mold, it begins to cure and solidify. This process can take anywhere from a few seconds to several minutes, depending on thickness, size, material and the complexity of the part.


Once the part has solidified, it is removed from the mold and any excess material is trimmed away. The finished part is then inspected for quality and any necessary finishing operations are performed.

Liquid Injection Molding Applications

LIM is particularly useful for producing parts with complex shapes or thin walls, as it allows for precise control over the material flow and curing process. LIM offers numerous advantages over other molding processes, such as improved part consistency, reduced waste, and faster cycle times. As a result, LIM is widely used in various industries, including automotive, medical, and consumer goods.


In the automotive industry, LIM is used to produce parts such as gaskets, seals, and connectors. These parts require high precision and durability, which LIM can provide. Additionally, LIM can produce complex geometries that are difficult to achieve with other molding processes. This makes LIM a popular choice for automotive manufacturers looking to improve their product quality and reduce costs.

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In the medical industry, LIM is used to produce parts such as catheters, seals, and valves. These parts require high bio-compatibility and chemical resistance, which LIM can provide. Additionally, LIM can produce parts with tight tolerances and complex geometries, which are essential in medical applications. This makes LIM a popular choice for medical device manufacturers looking to improve patient outcomes and reduce costs.

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In the consumer goods industry, LIM is used to produce parts such as VR face covers, watchbands, and buttons. These parts require high precision and durability, which LIM can provide. Additionally, LIM can produce parts in various colors and textures, which are essential in consumer goods applications. This makes LIM a popular choice for consumer goods manufacturers looking to improve their product quality and reduce costs.


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Advantages and Disadvantages of Liquid Injection Molding

LSR Injection Molding Advantages


Liquid injection molding offers several advantages that make it an attractive option for those who are looking to optimize their production processes. One of the key benefits is the high level of product precision that can be achieved through this method. With liquid injection molding, manufacturers can create highly detailed and complex parts with a high degree of accuracy and consistency.


Another advantage of liquid injection molding is its ability to produce parts in a single molding cycle, which enables automated production and high output rates. This not only saves time and effort but also reduces the need for manual labor and electricity consumption, resulting in significant cost savings.


In addition to these benefits, liquid injection molding also eliminates the production of scrap materials, which can further reduce costs and environmental impact. The process is highly efficient and produces minimal waste, making it an eco-friendly option for manufacturers.


Moreover, liquid injection molding provides a more comfortable and concise working environment for operators. This can lead to increased efficiency and productivity as operators can focus on their tasks without being distracted by uncomfortable working conditions.

LSR Injection Molding Disadvantages


Liquid injection molding does have some limitations. For example, it can be more expensive than other compression molding processes due to the cost of the raw materials and the specialized equipment required. Additionally, the process can be more complex than other silicone molding processes, requiring specialized expertise and equipment.

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Liquid Injection Molding Silicone Products Manufacturer

Liquid injection molding is a highly versatile process that offers a wide range of possibilities for producing complex medical devices, automotive components, and simple gaskets and seals. The process is made possible by the unique properties of liquid silicone rubber, which can be formulated to meet a diverse set of performance requirements, including high temperature resistance, harsh conditions, and bio-compatibility. At YEJIA, we have over two decades of experience in R&D and production of liquid injection molding products. Our expertise in this field allows us to deliver high-quality products that meet the most demanding specifications. If you're looking for a reliable liquid injection molding factory, please don't hesitate to contact us. We'll be happy to discuss your needs and provide you with a customized solution that meets your requirements.