Why Use Liquid Silicone Rubber in Injection Molding
By Nice Rapid | Nov 30 , 2020

The most common material used in the injection molding process in different industries is plastics. Some of the reasons why plastics are widely used are because they are lightweight, durable, and can be molded easily in various shapes and sizes.


However, materials such as thermoplastic elastomers are not strong enough to withstand the extreme heat. It could lead to distortion and losing the shape upon exposure to high temperatures. And because of this, the use of liquid silicone rubber is getting popular these days.


Mechanical Properties of Liquid Silicone Rubber

The properties of liquid silicone rubber differ depending on their grades. Because of its versatility, it is used in several applications. Regardless of what industry you will use it, the material provides superior resistance to bacteria.

If you use it in automotive parts that can withstand too much heat and vibration, the liquid material mechanical properties can make an excellent starting point.

The critical property of silicone rubber includes low compression set fast curing, resistant to heat, oil, water, and tear, electrical conductivity, and transparency. It is also used because of its strength and durability.

As recommended by experts, you can use LSR at a temperature that ranges from -1000C to 2000C, under UV light for an extended number of hours, immerse in water, solvents, or oil and when exposed to wind and rain. The different grades of liquid silicone rubber have properties that can withstand even the most challenging conditions.



The Benefits of Using Liquid Silicone Rubber, some of the benefits of LSR include:


[1] Superior Heat Stability

As mentioned earlier, LSR can withstand up to 2000C without melting or creeping. It is highly recommended for heavy-duty and automotive applications such as gaskets and seals.

[2] Low-Temperature Flexibility

If subjected to extreme temperature, thermoplastic elastomers can lose their flexibility. At low temperatures, they become brittle and harder until they finally crack while the LSR remains flexible at temperatures below -50 degrees Centigrade. The liquid silicone rubber is an excellent material for products that require to operate in a low-temperature environment.

[3] Resist Aging

Its ability to resist aging is an essential factor when it comes to the injection molding process. Cured liquid silicone rubber materials provide optimum resistance to UV rays, aging, and weathering. It is the best material to use if the procedure involves prolonged exposure to elements.

[4] Chemical Resistance

Unlike thermoplastic elastomers that offer only chemical resistance to moderate temperature, the LSR provides low water absorption and can resist common chemicals even when exposed to extreme cold and heat.

[5] Low-Compression Set

A low compression set pertains to the material that is deformation free under a continuous strain. The LSR has low compression, which is typically 15 to 29%. The material was able to maintain its elasticity even if compressed for a longer time and subjected to different temperatures.

[6] Great Shelf-Life Reliability

Shelf-life is the main factor that contributes to the ease of use of the material in the manufacturing industry. The majority of the LSR products are available with a shelf life of at least one year.


If you have some silicone rubber parts need to make, warmly to contact us via enquiry@nice-rapidtooling.com. We have advanced equipment and expert team that allows us to provide high quality products. 

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