PP: The chemical-resistant all-rounder
We offer a wide range of plastic materials at PlastShop.se, but one of the most versatile and chemical-resistant is polypropylene (PP). This material is often used in environments where chemicals are present, but what makes PP so special? In this article, we’ll look at the properties and applications of PP, and we’ll explore the differences between PP-H, PP-C and PP-R.
What is polypropylene?
PP is a thermoplastic that is lightweight, chemical-resistant and has low absorbency. This makes it suitable for use where chemicals and liquids are present. But which type of PP should you choose? There are various variants, such as PP-H, PP-C and PP-R, each with its own properties.
PP-H, PP-C, and PP-R: What's the difference?
PP-H is a homopolymer variant of PP, meaning it consists of a single type of monomer. This gives PP-H high chemical resistance and low absorbency. PP-C is a copolymer variant consisting of a mixture of monomers. This gives PP-C a slightly lower chemical resistance, but it is still highly resistant to many chemicals. PP-R is a block copolymer variant consisting of a combination of PP-H and PP-C. This gives PP-R high chemical resistance and low absorbency, as well as high mechanical strength.
The type of PP you should choose depends on the intended application. If you require high chemical resistance and low water absorption, PP-H may be the best choice. If you require slightly lower chemical resistance but still high mechanical strength, PP-C may be a better choice. If you require both high chemical resistance and high mechanical strength, PP-R may be the best option.
Chemical Resistance
One of the most important properties of PP is its chemical resistance. PP is resistant to many chemicals, such as acids, bases and solvents. However, it is important to remember that if PP is exposed to a chemical to which it is not resistant, the material may degrade. This can cause the material to lose its strength and chemical resistance. It is therefore important to always check the chemical resistance of PP before using it.
Weldability
Another important property of PP is that it is weldable. PP can be welded using methods such as hot-air welding and ultrasonic welding. This makes it possible to create complex shapes and structures. When welding PP, it is important to bear in mind that the material can become brittle if exposed to high temperatures. You should therefore always follow the recommendations for welding PP and use the correct equipment and techniques.
Applications
PP is used in many different areas, such as tanks, ventilation and chemical processing. This is due to its high chemical resistance and low absorbency, making it a suitable choice where chemicals and liquids are present. But why is PP the first choice in chemical environments?
One reason is that PP is highly chemical-resistant, meaning it can withstand many different chemicals without breaking down. Another reason is that PP is lightweight and has low absorbency, making it suitable where weight and absorbency are important factors. Finally, PP is also good value for money.
PP is also used in the food industry for packaging and containers, as well as in the healthcare sector for medical instruments and equipment. One reason for this is that PP is hygienic and easy to clean. Furthermore, PP is chemical-resistant and good value for money.
Temperature Limits
PP can be used at temperatures up to 65° Shore D, which means it can be used in applications where high temperatures are present. However, if PP is exposed to higher temperatures, it can degrade and lose its strength and chemical resistance. You should therefore always check the temperature limits before using PP.
Are you wondering if PP is the right material for your project? Feel free to contact us, and we'll help you find the right one!
PP: Den kemikalieresistenta allroundern