What are PolyProp Bottles?

When it comes to plastic bottles, there are a wide array of materials to select from. As a proudly South African Plastics Bottle Manufacturer, B&I Polycontainers typically offers our clients a selection of five different types of material to choose from:

  • PVC
  • Polyprop
  • PET
  • HDPE
  • LDPE

Today, we will be talking about Polyprop, one of the more rigid, yet stable materials you can use to make a plastic bottle.

What is Polyprop?

Discovered by Italian scientists in the mid-1950s, polypropylene, or commonly referred to as polyprop, is surpassed in production volume only by polyethylene, discovered a couple decades earlier. Polypropylene’s unique chemical makeup reveals itself in its various superpowers (OK, characteristics):

  • It has a high melting point, so it’s used for many microwave containers;
  • It doesn’t react with water, detergents, acids, or bases, so it won’t break down easily;
  • It’s resistant to cracking and stress, even when flexed, so it’s used in lots of hinges;
  • It’s quite durable, so it withstands daily wear and tear.

Polypropylene’s characteristics make it ideal for tough, robust products ranging from protective car bumpers to life-saving medical tools to cold-weather gear. Plus it also can be engineered into a wide range of packaging that helps protect products we rely on every day, from medicine to yogurt to baby food.

In terms of plastic bottles, many chemical companies choose polyprop bottles to store their products. This is because it doesn’t break down easily or react with water, detergents, acids, or other bases.


How are Polyprop bottles made?

Polypropylene is a very useful plastic for injection molding as it is easy to mold despite its semi-crystalline nature, and flows very well because of its low melt viscosity. This property significantly enhances the rate at which you can fill up a mould with the material. Shrinkage in polypropylene is about 1-2% but can vary based on a number of factors, including holding pressure, holding time, melt temperature, mould wall thickness, mould temperature, and the percentage and type of additives.


What are the Advantages of Polypropylene?

  1. Polyprop bottles are readily available and relatively inexpensive.
  2. Polyprop bottles have high flexural strength.
  3. Polyprop bottles are very resistant to absorbing moisture.
  4. Polyprop bottles have a good chemical resistance over a wide range of bases and acids.
  5. Polyprop bottles have great impact strength.

What are the Disadvantages of Polypropylene?

  1. Polyprop bottles are susceptible to UV degradation.
  2. Polyprop bottles have poor resistance to chlorinated solvents and aromatics.
  3. Polyprop bottles are known to be difficult to paint as Polypropylene has poor bonding properties.
  4. Polyprop bottles are highly flammable.
  5. Polyprop bottles are susceptible to oxidation.


Order your own Polyprop Plastic Bottles

So there you have it – everything you need to know about Polyprop bottles and Polypropylene. If you have any questions or comments, feel free to contact us and let us know what you’re thinking. We’d love to hear from you.

B&I Polycontainers is a plastic bottle and packaging manufacturer in South Africa, and is able to provide high quality Polyprop plastic bottles for any industry. If you would like to know more about Polyprop bottles, see production of the Polyprop bottles in action or order your own plastic Polyprop bottles, contact B&I Polycontainers today.


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