Special Applications Injection Molding

Special Applications

Liquid Silicone Rubber (LSR) components offer high thermal stability and UV resistance, and long-term, non-aging mechanical properties in many challenging environmental conditions. Fully automated injection molding technology is ideal for tight tolerances, whether the part has simple, complex, or unique geometries.

For specific information regarding material and application alternatives, we recommend visiting our technical information page or contact us directly.

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Low Presure Sensing Switch Membranes

With its superior flexibility, LSR allows for elongation without permanent deformation. One-way valves, dual valves, and exit nozzles are generally designed in such a way that they open when a certain amount of pressure is applied, and they revert to their original sealed position when the pressure is removed. LSR is an ideal material for these applications.

LSR allows manufacturing extremely thin membranes down to thicknesses of 0.15 mm for applications such as pressure switches for gas forced-air furnaces. Even minimal errors in thickness distributions throughout the part or distortions during assembly can lead to incorrect gauge readings. Minimizing assembly steps and errors is critical for high precision gauges where the membrane tension directly controls gauge behavior. Even minimal errors in thickness distributions throughout the part or distortions during assembly can lead to incorrect gauge readings. With multi-component molding, precise tolerances and uniform thicknesses throughout the part are possible, thereby eliminating related assembly errors.

Customized Seals and Gaskets


In most industrial applications, parts are subjected to harsh environmental conditions where the life time of a component may depend on its seal or gasket. Whether the reason for the seal is to provide water resistance, alignment, dampening, or to withstand high pressures, LSR will excel in maintaining the lifetime requirements of your equipment or parts. With fully automated injection molding processes, improved quality and tight tolerances are achieved, especially when compared to HCRs. Depending on the design of the part, LSR overmolding or LSR 2-Shot (LSR/Thermoplastic) injection molding can provide the precision and quality required while reducing assembly costs.

Key Pads

LSR allows for perfectly transparent buttons and/or any degree of semi-transparency with an enormous range or color possibilities. The tactile feel and the amount of force required when pressing a button may be easily altered by modifying part geometries and/or by selecting alternative LSR materials. There is a vast range of LSR materials available, each with slightly different material characteristics, including look and feel.

Sealed Housings


For complicated assemblies that require precise placement of a seal, gasket, or delicate rubber component, or when part performance is critical and errors in assembly cannot be tolerated, LSR 2 shot molding or LSR overmolding can provide a cost effective option that eliminates assembly challenges and errors. Reductions in assembly costs and improved part performance can be made possible with LSR overmolding. LSR can be chemically and mechanically bonded onto thermoplastics without the need for primers. Direct bonding onto metals using an integrated adhesive and/or mechanical bonding is also possible and creates a strong, lasting bond.

Is Silicone Rubber Right for Your Application?

Silicone rubber is a highly dynamic material. Its durable characteristics and extreme versatility make it the ideal choice for a wide range of applications beyond those described on this page. Choose silicone rubber for your project if you need a material that can deliver superior resistance to extreme temperatures, high dielectric strength, and strong overall mechanical properties. Silicone rubber can also be sterilized for use in medical and food/beverage applications. For more information, keep browsing our website to check out other Markets pages, or contact our office directly.

Working With SIMTEC

SIMTEC is a leading manufacturer of custom liquid silicone parts. Offering unmatched expertise and production capabilities, we can quickly turn around high volume orders. We are a partner to demanding, forward-thinking customers in many industries, including automotive and medical device manufacturing, consumer products and more.

With one of the lowest defect rates in the industry, and a proactive approach to quality management that’s been certified to ISO 9001:2015, ISO 13485:2016 and IATF 16949:2016 standards, there’s no better partner for any LSR manufacturing project than SIMTEC.
We’d be happy to discuss your specific requirements and explain in detail how we can help with your large quantity product needs. — call or email our office to speak with an engineer today.