What is Polypropylene Resin? Properties, Function, History, Types, Advantages & Disadvantages

by | Resin

Polypropylene (PP) also is a thermoplastic polymer. It is used in a large variety of usage. It is generated via chain-growth polymerization from the monomer propylene. 

Its functions are similar to polyethylene. But it is harder and more heat resistant. It is a white, mechanically rugged material. Polypropylene is the second-most broadly good electrical insulator.

Let’s learn what is Polypropylene Resin, its Definition, Properties, Function, History, Types, Advantages, Disadvantages, and the difference between Epoxy Resin and Polypropylene Resin.

What is Polypropylene Resin? 

Polypropylene is a category of thermoplastic polymer resin. In short, it is a very beneficial type of application with many commercial, industries applications.

The main good of polypropylene is also the main reason why manufacturers above industries prefer it to other types of plastic. It can usually resist higher temperatures. It is used to create lunch boxes, margarine containers, yogurt pots, syrup bottles, prescription bottles. Plastic bottle caps are generally made from PP.

Properties of Polypropylene Resin

Some of the properties of Polypropylene are semi-rigid, translucent, good chemical resistance, tough, good fatigue resistance, and so on.

The methyl groups have better mechanical properties and thermal resistance. Although the chemical resistance reduces. 

The properties of polypropylene depend on a few factors, especially molecular weight and molecular weight distribution.  

Polypropylene is generally tough and adaptable, especially when copolymerized with ethylene. This makes polypropylene be used as an engineering plastic and as competing with materials, for example,  acrylonitrile butadiene.  Polypropylene is reasonably cheap Polypropylene has good resistance to chores.

The melting point of polypropylene occurs in a range, so the melting point is set on by finding the highest temperature of a differential scanning calorimetry chart. The thermal expansion of PP is very large.

Polypropylene is resistant to fats. It is resistant to almost all organics solvents at room temperature. Most commercial polypropylene is isotactic. 

The Function of Polypropylene Resin 

  • Polypropylene is used in household and industrial applications. Its unique properties and ability to adapt to different fabrication techniques make it stand out as a crucial material for a wide range of uses. 
  • Polypropylene has the ability to function as plastic material as well as a fiber.
  • Polypropylene has a unique capability to be manufactured through different methods and into different applications. Its development has been sustained over the years.
  • At Creative Mechanisms, we have used polypropylene in several applications across a scale of industries. 
  • One of the most interesting examples is the capability of CNC machine polypropylene to include a living hinge for prototype living hinge development.
  • Polypropylene is a very malleable, soft material with a relatively low fluxing point.

History of Polypropylene Resin  

Isotactic polypropylene was invented in 1954. Italian chemist Giulio Natta and his assistant Paolo Chini invented it by working in alliance with the Montecatini Company, now known as Montedison SpA. They employed catalysts of a type recently founded by the German chemist Karl Ziegler for synthesizing polyethylene.

Types of Polypropylene Resin 

There are two main types of polypropylene available: 

  • Homopolymers and 
  • Copolymers. 
  1. Copolymers  

The copolymers are further split up into block copolymers and random copolymers. Each fits certain applications better than the others. Polypropylene is generally called the “steel” of the plastic industry. Because of the different ways in which it can be modified or customized to best serve a specific purpose. 

  1. Homopolymer  

Homopolymer polypropylene is a normal grade. You can think of this as the default state of the polypropylene material. Unplanned copolymer polypropylene – as opposed to blocking copolymer polypropylene – has the co-monomer units Ordered in irregular or random patterns including anywhere between 1% to 7% ethylene and are selected for applications where a more flexible, clearer product is desired.

Polypropylene Resin Advantages 

Despite its defect, polypropylene is a great material overall. Some plastics, like those that contain BPA harm bodies or the world we live in. Polypropylene, a complex plastic, is normally considered safe for humans.

Polypropylene Resin Disadvantages 

Polypropylene has an excessive thermal expansion coefficient which limits its high-temperature applications.

Polypropylene has deficient resistance to chlorinated solvents and aromatics.

Polypropylene is known to be difficult to paint as it has poor bonding things.

Polypropylene is highly burnable. 

Polypropylene is vulnerable to oxidation. 


Polypropylene is readily available and relatively Economical. Polypropylene has high flexural power due to its semi-was nature. Polypropylene has a relatively slippery plane. 

Polypropylene is very resistant to engrossing moisture. Polypropylene has good chemical resistance over a broad range of bases and acids. 

Polypropylene possesses strength, drudger resistance, and polypropylene has a good impact strength. Polypropylene is a good electrical insulator.

I believe you have got a clear concept about the Polypropylene Resin Definition, Properties, Function, History, Types, Advantages, Disadvantages, and the difference between Epoxy Resin and Polypropylene Resin.


  1. www.polymeracademy.com
  2. www.wikipedia.org
  3. www.creativemechanisms.com

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