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Liquid Silicone Products

Liquid Silicone Rubber (LSR) Injection Molding

JESilicone offers complete turnkey solutions for all business in need of high quality liquid silicone rubber injection molded parts (LSR molded parts) . Our team of experts has decades of knowledge and experience LSR injection molding. We provide greater value to our partners by providing a full customization services from early design and prototype, and deliver high-precision, high-volume, and high-quality Liquid Silicone Rubber Molded Parts.

We can help you choose the best raw material, and provide you with tooling solutions that are best for your upcoming project’s needs.

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Customized Liquid Silicone Rubber Products

How Does Liquid Silicone Rubber Molding Work?

First, a liquid silicone rubber molding tool is created using CNC machining. This tool must be a high-temperature tool in order to withstand the LSR injection molding process. The tool may then be polished to allow for different finish options.

Next, the finished tool is loaded into an LSR-specific injection molding press that is precision geared for accurate control of shot size to produce the most consistent LSR parts. Materials used include standard silicones and specific grades to fit different part applications. Because LSR is a thermosetting polymer, its molded state is permanent. Unlike thermoplastics, they can’t be melted again. Once the LSR injection mold parts are ready, they are removed from the mold and then put to use as prototypes or production parts.

LSR Molded Parts Used for Wide Industries

JESilicone supplies a wide range of custom Liquid Silicone Rubber (LSR) molded parts. These components can be found in products used in a wide array of industries, including medical, healthcare, consumer goods, food & beverage, automotive, industrial and special applications.

Let a JESilicone expert offer you solutions that will help optimize your design, meet your high quality, high volume demand for precision LSR injection molded components, and add value every step of the way.

Frequently Asked Questions

LSR is a high-purity, two-part platinum-cured silicone with exceptional properties. It is known for its flexibility, biocompatibility, and resistance to extreme temperatures, UV light, and chemicals. These characteristics make LSR an ideal material for a multitude of applications, particularly where precision and reliability are paramount.

Here are the primary steps involved in the liquid silicone rubber injection molding process:

1. The uncured liquid silicone is contained in two containers, Compound A and Compound B, which connect to the pumping system. container A holds the base-forming material, and container B contains a catalyst. A metering unit automatically releases the two substances at a constant one-to-one ratio, as well as an additional color pigment for color parts.

2. The molder programs and customizes the automated injection-molding machine to control the injection settings for delivery of the appropriate shot size for each job. The platens and pistons align and close the mold and have settings for the temperature, pressure, injection rate, and cycle time adjusted to meet the customer part designs.

3. After the completion of the setup, the molding machine heats the mold’s cavities to the appropriate temperature and applies the appropriate clamping force. The mold closes in coordination with the machine’s injector, pump, and supply. The injection mechanism then pushes the material into the mold cavities.

4. A combination of heat and pressure applied to the liquid silicone rubber cures the material until it solidifies. Upon completion of the cycle, the mold opens for the demolding of the parts. The parts are removed and separated with an automated robotic parts removal system. In less sophisticated manual molding operations with smaller production runs, a worker removes the parts.

5. After the demolding and parts removal process, if post-molding secondary operations are required, these processes are performed after the molding is complete. Secondary operations could include slitting, printing, marking, assembly, or post-curing. Some advanced molders automate these steps and perform the value-added secondary processes immediately upon the parts removal from the mold. The molded parts are robotically removed from the molding machines and delivered to a designated station for completion of the secondary process, within the same manufacturing cell.

Precision and Consistency: LSR molding produces parts with tight tolerances and consistent quality, making it ideal for applications requiring high precision.

Complex Geometries: The low viscosity of LSR allows it to flow into complex mold designs, enabling the production of intricate shapes and fine details.

Durability: LSR parts are durable and resistant to extreme temperatures, chemicals, UV light, and other harsh conditions.

Biocompatibility: LSR is biocompatible and hypoallergenic, making it suitable for medical devices, baby care products, and food contact applications.

High Production Efficiency: The automated nature of LSR molding allows for high production rates and scalability.

Solid Silicone Rubber
The difference between solid and liquid silicone rubber is due to its makeup at a chemical level. Solid silicone contains polymers with a high molecular weight and relatively long polymer chains. Typically, solid silicone is produced in bars and other solid shapes. These bars are then able to be molded into the desired product. Solid silicone is a simple solution for many basic products, but it is limited compared to the versatility and customization of liquid silicone.

Liquid Silicone Rubber
On the other hand, Liquid silicone rubber contains polymers of lower molecular weight and shorter chains. One of the main advantages of liquid silicone is its versatility. In liquid form, this silicone is a blank canvas that can be customized with color options and additives.

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