Liquid silicone rubber is a high purity, two-component platinum cured silicone that is suitable for the manufacture of technical parts that require strength, resistance and high quality.
LSRs are viscous, pumpable products that are primarily manufactured using liquid injection molding. Liquid Silicone rubber is used in a wide range of applications in the elastomer industry, from consumer goods to medical devices and anything in between.
Firstly, if you don’t know what is silicon rubber then please check the article related to it, and get knowledge of it. So, you can easily understand LSR.
HOW IS LIQUID SILICONE RUBBER MANUFACTURED?
Sand or silicon dioxide is the most common raw material for liquid silicone rubber. Sand is refined into pure silicon metal, which is then reacted with methyl chloride, followed by a series of additional steps to manufacture a range of silicone products, ranging from fluids and polymers to rubber bases and compounds in finished form Silicones, unlike most plastics, have a backbone made up of alternating silicon and carbon atoms, as well as organic side chains that confer curability.
LSR shares some processing features with thermoplastics but also has some distinct variations that are unique to thermosets. The LSRs are crosslinked using a platinum-catalyzed reaction with no byproducts. LSR cannot be reshaped, reused or recycled once it has been cured.
LIQUID SILICONE RUBBER PROPERTIES
Silicone rubber comes in a variety of grades, each with its own set of material properties. One of the reasons LSR is used in so many different applications is because of its flexibility.
Liquid silicone’s mechanical properties make it a great place to start if you need a medical or food-grade product with superior bacteria resistance or an automotive part that can withstand extreme heat.
The quick curing and low compression collection of silicone and its resistance to tearing, heat, water and oil and electrical conductivity, and overall strength are all essential material properties.
LSR can be used at temperatures ranging from -100 to 200 degrees Celsius, exposed to wind, rain and UV light for long periods of time and immersed in water, oil or solvents.
LSR comes in a range of grades with material properties that can withstand even the most challenging applications.
APPLICATIONS OF LSR
The manufacturing of LSR parts is the most common application for silicone rubber. LSR components are used in a variety of industries.
They are ideal for gaskets and hardware in consumer appliances like microwaves because of steam resistance and low compression set. They are suitable for electronic interfaces on keyboards and touchpads because of their conductivity and fatigue resistance.
Their oil resistance ensures that automotive components last long. Liquid silicone rubber is a highly adaptable material, with new uses being found and tested regularly.
It’s used in a variety of industries, including healthcare, automobile parts manufacturing, electronics and consumer goods, gaskets and other hardware and many others.
CHEMICAL STRUCTURE OF LSR
Long polysiloxane chains are reinforced with specially treated silica in a two-component method known as liquid silicone rubber.
Component A contains a platinum catalyst, while Component B contains the crosslinker and alcohol inhibitor methyl hydrogen siloxane.
The primary difference between liquid silicone rubber and high consistency rubber is that LSR materials are flowable or liquid. Although HCR can cure with either peroxide or platinum.
LSR can only cure with platinum additively. Liquid silicone rubber injection moulding needs special care due to the thermosetting nature of the content, such as intense distributive mixing when keeping the material at a low temperature until being forced into the heated cavity and vulcanized.
ADVANTAGES AND DISADVANTAGES OF LSR
ADVANTAGES OF LSR
- Increased resistance to extreme heat
- Flexible design options, such as thick to thin wall constructions
- Tear resistance is high
- Biocompatibility is a significant aspect to consider
- Chemical resistance is high
- Set of superior compression
DISADVANTAGES OF LSR
- There is no way to recycle it
- The appearance is bulky or heavy
- Early cure can cause production delays because equipment must be disassembled
- Liquid plastic can be tricky to work with
- Curing time is long, which adds to the production time and expense
- If heated after curing, the possibility of burning exists.
- After healing, the power to remould
We hope you can use this knowledge to source more efficiently for your needs, now that we have covered the basics of Liquid Silicone Rubber, such as what it is, its properties and its applications.
However, Liquid Silicone is only one of the several common types of rubbers, each with its own set of characteristics and applications.
Check out our types of rubber guide if you want to learn more about how different rubbers compare to one another or follow us on social media to stay updated