LSR Injection Molding Technology

LSR injection molding technology stands for "Liquid Silicone Rubber Injection Molding Technology." It is a process used to manufacture plastic components from liquid silicone. Liquid silicone is a high-quality material with excellent physical and chemical properties, making it suitable for the most demanding applications in industries such as medical technology, electronics, automotive, food, and many others.

The LSR injection molding process is similar to conventional thermoplastic injection molding, but instead of using solid plastic granules, liquid silicone components are used.

A versatile material with outstanding properties

At K&L, only platinum-cured LSR materials are used, ensuring reliable and controlled crosslinking. Compared to peroxide-cured silicones, platinum-cured LSR materials offer improved performance and comply with food regulations according to GMP guidelines.


LSR silicone exhibits excellent temperature resistance, both at high and low temperatures. It can withstand extreme temperatures without compromising its properties. Additionally, it is resistant to chemicals and shows high resistance to environmental influences. These properties make LSR silicone an ideal material for applications where reliable performance under various conditions is required.

Another advantage of LSR silicone is its water-repellent surface. This characteristic makes it ideal for applications where waterproofing is necessary. Moreover, LSR silicone is biocompatible, meaning it is compatible with the human body and can be safely used in medical applications.

LSR silicone is also flame-resistant and highly non-flammable. It demonstrates high resistance to flames, meeting important safety standards. Furthermore, it is chemically inert, which means it is not sensitive to many chemicals. It can also come into contact with various media such as oil and fuel without compromising its properties.

The material also offers electrical insulation properties and can be adjusted from insulating to semiconducting, depending on the requirements of the application. It is also radiation-resistant and exhibits high strength along with high elasticity and flexibility. As a result, it is well-suited for applications that demand flexibility and reliability.

LSR silicone is transparent, but it can be colored in any desired shade using color pastes, allowing for a wide range of design possibilities. The material adheres well to various surfaces and demonstrates high tear resistance.

Another significant aspect of LSR silicone is its approval by the FDA (Food and Drug Administration) in the USA and the Bundesinstitut für Risikobewertung (BfR). These approvals confirm the material's suitability for contact with food, contributing to its safety and trustworthiness.

In summary, LSR silicone is an extremely versatile material with an impressive range of properties. It offers an optimal combination of temperature resistance, chemical resistance, flexibility, biocompatibility, and many other advantages. Whether in medical technology, automotive industry, food processing, or other fields, LSR silicone has established itself as a reliable and efficient material.

The Diverse Applications of LSR Silicone

Seals, O-rings, and gaskets are among the most common applications of LSR silicone. Due to its excellent resistance to temperature variations, chemicals, and environmental factors, it provides reliable sealing to contain liquids or gases and prevent leaks.

LSR silicone also finds wide application in the household goods sector. It is used for manufacturing kitchen utensils, baking molds, tableware, and other household products. The food-grade property of LSR silicone, in accordance with GMP guidelines, ensures its safe contact with food.

Likewise, LSR silicone is widely used in the baby care industry. It is employed in the production of baby bottles, pacifiers, teething rings, and other products. The biocompatibility of LSR silicone makes it a safe option for use with infants and toddlers.

In applications where biocompatibility is a crucial requirement, LSR silicone plays a significant role. It is frequently utilized in medical technology, for example, in implants, catheters, medical tubing, valves, and much more. The material meets stringent biocompatibility requirements and can safely come into contact with the human body.

An interesting feature of LSR silicone is the ability to combine hard and soft components. This allows for the production of products with different hardness levels in various areas, for example, combining a soft grip with a firm structure. This is especially useful in the manufacturing of handles, grips, and other products where both comfort and functionality are equally important.

LSR silicone is also used as a vibration damper and for mechanical decoupling. Thanks to its high elasticity and flexibility, it effectively absorbs vibrations and reduces transmission to adjacent components. This is of great importance in the automotive industry, electronics industry, and other fields where vibration damping is required.

Further applications of LSR silicone include the production of switches, buttons, bellows, and many other products. Due to its chemical resistance, resistance to environmental factors, and its ability to realize complex shapes and structures, LSR silicone is a preferred choice for these applications.

Overall, LSR silicone offers a wide range of solutions for various industries, thanks to its diverse properties and application possibilities. From medical technology to household goods and technical applications, LSR silicone has established itself as a reliable and high-quality material.

Efficient Technology and Machinery for LSR Silicone Processing

At K&L, state-of-the-art machines and technologies are available to ensure precise and efficient processing of LSR silicone. Here are some key aspects of the technology and machines used in LSR silicone production:

The machines at K&L allow the production of articles weighing from 0.2g to 1000g. This flexibility enables a wide range of product manufacturing.

Temper ovens play a crucial role in LSR silicone production. K&L has both stationary ovens and rolling ovens. These ovens are used for tempering and post-curing LSR parts to achieve the required mechanical properties and final hardness.

Manufacturing 1K to 3K articles is possible. This means that a single article can be made from one component (1K) or multiple interconnected components (2K or 3K). This allows the production of complex and functional LSR parts.

LSR silicone can be produced in all colors. With the ability to process silicone in various colors, the design and customization of products are virtually limitless.

Processing of LSR silicone is possible from 20kg containers to 200kg containers. This allows for flexible production according to customer requirements.

Production at K&L is fully automated, ensuring high efficiency and precision. Automated processes ensure consistently high quality and enable short cycle times.

Insert parts are placed using robot automation, ensuring precise placement of insert parts and high efficiency in assembling components.

K&L has its own toolmaking department for the production of LSR molds. This allows for rapid development and adaptation of molds according to customer requirements.

LSR manufacturing is carried out in a separate area with its own infrastructure. This ensures optimal conditions for the processing of LSR silicone.

Cooling systems are used on the injection molding machine to control the temperature of the mixer and cold runner, ensuring precise and stable processing temperature.

By utilizing modern technologies and efficient processes, short cycle times can be achieved, resulting in higher production speed and improved productivity.

Both horizontal and vertical machines are used to manufacture a wide range of products, meeting diverse requirements.

Insert techniques allow for additional components or insert parts to be incorporated into LSR silicone during the injection molding process. This opens up new possibilities for product design and functionality.

Multi-component combinations, especially hard-soft combinations, are possible. By using multiple materials, products with varying hardness levels and functionalities can be produced.

Up to four additives can be introduced to improve or customize specific properties of the LSR silicone.

Cold runner technology is employed to optimize the flow paths of LSR silicone in the molds and reduce material consumption.

With these technical capabilities and an efficient machinery setup, K&L ensures the high-quality production of LSR silicone products that meet the most demanding requirements.


Mike Radenbach
Mike Radenbach
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