Molding of Liquid Silicone Rubber

Molding of Liquid Silicone Rubber

Liquid silicone rubber, or LSR, is an ideal choice for high-performance elastomer components that must be durable, flexible and fluid compatible across a broad range of temperatures.musensil lsr material factory LSR is also highly biocompatible and can be used for parts that come into contact with humans, including prosthetics. It is resistant to bacteria and other microbes, can withstand harsh chemicals, and can perform at extreme low and high temperatures without losing physical form.

As a liquid, LSR can be easily poured into a mold to create finished components.musensil lsr material factory The manufacturing process for LSR can be much faster than a thermoplastic injection molding, as there is no need to pre-heat the material or use any heat tools to melt it. This makes the entire process more efficient, allowing for a shorter cycle time, which means that more parts can be produced in less time.

The liquid nature of LSR also allows for better flow through thin-walled sections of the mold, which can make it easier to create tight tolerances and a precise part fit.musensil lsr material factory As with any molded plastic component, however, proper mold design is critical for producing consistent, quality parts. A number of factors influence how well a part molds, including the geometry of the design, the materials used, and the overall vulcanization characteristics of the curing LSR.

For example, a mold for an LSR window gasket must be carefully designed to ensure that the gasket fits the opening with minimal stress and distortion.musensil lsr material factory Additionally, it is important to consider how a finished part will be removed from the mold and transported to storage, as this can impact part quality and mold maintenance requirements in the future. Typically, a non-polished finish is preferred to avoid the risk of damaging LSR during demolding and handling. It is also important to ensure that wear items such as bushings and side locks are easy to access and can be replaced on a regular maintenance schedule.

LSR can be molded alone, or in combination with other technical plastics and composites, using what is known as 2C LSR technology. Trelleborg’s unique capabilities allow for simultaneous injection of two or more different material types into the same mold, which offers customers a wide range of possibilities for advanced technical components in high volume.

Injection of LSR begins with the liquid raw material, which is typically supplied in separate five gallon pails or 55-gallon drums. The two containers are connected to a process controlled pumping kit that presses down on the buckets to force the material into a static mixer and then onto the injection unit. The mixing and pumping system can be adjusted according to the project specifications. For instance, the ratio of raw material can be varied to control the amount of pigment added into the mixture. The two material streams then enter the injection mold at a set ratio, and the product is cured in a closed-loop system to maintain the molded shape. The process is very fast and reliable, with a typical cycle time averaging 30 seconds.

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