What is LSR Injection Molding

what is lsr injection molding

LSR injection molding is a revolutionizing silicone-based product manufacturing process. We always use it to produce precise, durable parts and products made from liquid silicone rubber in bulk quantity. And it involves injecting liquid silicone rubber into a mold cavity under high pressure. The liquid silicone rubber is heated and cured inside the mold to form the desired shape of the product. After all , this method is particularly useful for creating complex shapes, intricate details, and tight tolerances in the final product.

Besides, LSR molding is a cutting-edge manufacturing process that has revolutionized the production of silicone-based products. The technology offers numerous advantages, making it an ideal choice for a wide range of industries. In this article, we will delve into the process of LSR injection molding, its benefits, and its diverse applications across various sectors.

LSR injection molding Definition

As we all know, LSR injection molding is a specialized form of injection molding, primarily used for creating parts and products made of liquid silicone rubber. Silicone rubber, known for its exceptional qualities such as flexibility, heat resistance, and biocompatibility, has become increasingly popular in industries like healthcare, automotive, electronics, and consumer goods. LSR injection molding enables manufacturers to produce intricate and high-quality silicone components with consistency and efficiency.

LSR injection molding Process

The process of LSR injection molding involves several key steps:

1. Silicone Material Preparation

Liquid silicone rubber comes in two components – a base silicone rubber and a catalyst. Before the injection molding process, these two components are mixed thoroughly in a precise ratio to achieve the desired properties and cure time.

2. Injection Molding Machine

This machine that mixed LSR material is then fed into combines the liquid silicone rubber with heat and pressure to form a homogeneous mixture.

3. Injection

Injected into a mold cavity through a nozzle, we make the mold with steel and designed to match the product’s desired shape.

4. Curing

Once the LSR material fills the mold cavity, it is left to cure. The curing process can vary in duration depending on the material and the product requirements.

5. Ejection

After the curing process completed, the mold opens, and the solidified silicone product is ejected from the machine.


Benefits of LSR Injection Molding

1. High Precision and Consistency

LSR molding offers exceptional precision, enabling the production of intricate and complex designs with tight tolerances. Moreover, the process provides consistent results, ensuring uniformity across large production runs.

2. Versatility and Material Properties

Customize to meet specific requirements, such as hardness, color, and thermal stability. This versatility makes LSR suitable for a wide range of applications.

3. Biocompatibility and Safety

An excellent choice for medical and healthcare applications, including implants, medical device components, and baby products.

4. Heat and Chemical Resistance

Silicone rubber exhibits high resistance to extreme temperatures and chemicals, making it ideal for use in automotive, electrical, and industrial applications.

5. Reduced Waste

LSR molding minimizes material waste as it is a closed-loop system where excess material can be reused, promoting sustainability.


Applications of LSR Injection Molding

LSR molding finds applications across numerous industries:

1. LSR Healthcare

Medical devices, surgical instruments, seals, gaskets, and other healthcare products benefit from LSR’s biocompatibility and sterilization capabilities.

2. LSR  Automotive

LSR components in automotive applications include seals, gaskets, connectors, and custom parts due to their resistance to heat and various fluids.

3. LSR  Electronics:

to manufacture protective covers, keypads, insulating components, and other electronic device parts.

4. LSR  Consumer Goods

create various consumer products like kitchenware, baby products, personal care items, and more due to its safety as well as durability.

5. LSR  Industrial

LSR injection-molded parts find applications in industrial machinery, seals, gaskets, and other components requiring resistance to harsh environments.


LSR injection molding has transformed the silicone product manufacturing landscape, offering unparalleled precision, consistency, and material properties. Its versatility and wide range of applications have made it a favored choice for industries ranging from healthcare to automotive and beyond. So, as technology continues to advance, LSR molding is likely to play an even more significant role in shaping the products that enhance our daily lives.