5 Amazing Properties Of Polypropylene

Polypropylene is a highly versatile thermoplastic polymer commonly used in plastic injection moulding. It is a semi-crystalline polymer that is very popular across many industry sectors. It can be made into fibre for fabric, ropes etc. Or it can be produced in film or sheet form for packaging, medical devices and lots more. Different unique properties of polypropylene make it the second most widely produced plastic after polyethene.

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5 Facts You Need to Know About Polypropylene

All the above is pretty common knowledge, but there are plenty more impressive pieces of information about the properties of polypropylene, where it is so widely used and why.

1. How Versatile Is Polypropylene?

Polypropylene comes in several different grades, allowing it to be produced differently. For example, it can be created to look transparent or opaque, woven into fibres or shaped by plastic injection moulding. It can form solid shapes, rigid tubes and flexible sheeting and films. It is easily recyclable too. This is because the polymer chains that it contains do not degrade when they are melted down for plastic injection moulding. Instead, they retain their integrity so that polypropylene can be melted back down, reshaped and cooled for re-use. This makes polypropylene extremely versatile and more environmentally friendly than other types of plastic polymers too.

2. Properties of Polypropylene

Polypropylene is often chosen for plastic injection moulded manufacturing projects due to its many useful properties. For example, it is resistant to fatigue, which is essential for applications reliant on a hinge mechanism, such as bottle caps or lids attached to plastic boxes. It is also resistant to chemical leaching and corrosion. This makes the material ideal for medical and construction applications. More essential properties of polypropylene include resilience against most forms of physical damage, including impact and freezing.

This enables the material to be used in more demanding applications like pipes, construction tools and plastic components for industrial machines. It is perfect for manufacturing plastic tubing for plumbing, heating and cooling systems. Not to mention for food and beverage containers that are designed to be heated up in the microwave or kept in the fridge or freezer.

3. Medical Miracle Material

Polypropylene offers extremely high hygiene protection and heat resistance, enabling it for various medical and scientific applications. Common examples include synthetic sutures and medical meshes. Polypropylene is also a vital component of the raw materials used to make medical-grade face masks. Polypropylene can also be used to make medical diagnostic equipment, science equipment and even the chairs that patients sit on while waiting for medical appointments. The COVID-19 pandemic saw a massive increase in demand for the material worldwide.

4. Clothes, Fashion, Textiles and More

Polypropylene may not immediately spring to mind when thinking about which textiles are the most fashionable, but it is, nonetheless, a common component of clothing and accessories. It can be formed into fibres that are then woven together to create shopping bags and clothing straps. It is sometimes used in base layer clothing for its insulating properties and wick sweat away from the skin.

However, polyester is also a common choice for this type of clothing. Polypropylene is highly colourfast, which means that it can absorb dyes very well without causing them to reach out again in the wash. Other textile uses for polypropylene include carpets and mats, which benefit from their durable strength and resistance to chemical damage, heat and general wear and tear.

5. Unusual Applications

As well as all of the above examples of how polypropylene is used, it can be found in rather more niche areas. For example, it is used as a foam in radio-controlled model aircraft, where its lighter weight and higher density make it an essential ingredient. Polypropylene ropes are also used in the fishing industry, as they are often longer-lasting than other natural materials and can better withstand a repeated wetting and drying out cycle.

Polypropylene is great for kids&#; toys and things you touch a lot because it doesn&#;t get dirty easily. For example, the colorful stickers on a Rubik&#;s cube are made from polypropylene so they stay clean and can be moved easily. Also, polypropylene is used for making banknotes because it can have clear areas in the ink to help with security checks.

Commercial and household project managers know that with any remodel or design project, specifying with the right material in the beginning saves time and headaches down the road. In this post, you will learn about the pros and cons of synthetic carpet materials like nylon, polyester and polypropylene so you can make the best choice for your application.

Common Materials for Synthetic Rugs

The majority of synthetic rugs and carpet are made from nylon, polyester, or polypropylene: three materials known for their durability, cleanability, and versatility. These same materials comprise the majority of commercially rated carpet in the market today. 

Nylon

SynSisal® Astoria in Honey | @ The Bull Charlbury

What is it?

Nylon is a synthetic fiber or yarn used in both residential and commercial carpets. It is strong, abrasion resistant, and resilient, and therefore most commercial carpet face fibers (the top pile) are nylon.

Also Known As

Polyamide, PA6 (polyamide 6), Nylon 6, Nylon 6,6 and ECONYL®. 

• Nylon is a synthetic thermoplastic comprised of a polymer chain with recurring amide groups, hence &#;polyamide.&#;
• The numbers refer to the different carbon structures&#;nylon 6&#;s molecular structure has one monomer and 6,6 has two monomers. Although it is debated, there is little difference in performance between them.
• ECONYL® is a regenerated virgin-quality nylon product made from recovered and repurposed materials. The SynSisal collection is crafted from ECONYL® yarns, which can be recycled and regenerated into nylon fiber for reuse. A cradle-to-cradle cycle with positive environmental impacts.

Pros

• Contract Grade: nylon carpet is widely available with contract ratings for commercial settings
• Cleanable: unlike natural fibers, a nylon carpet is cleanable and resists stains
• Durable & Resilient: tough nylon fibers bounce back after compression
• Abrasion Resistant: high quality nylon is tough and handles heavy foot traffic and regular cleaning
• Colorfastness: thanks to solution-dyed yarns, colors stay true
• Hypoallergenic: nylon is moisture and mildew resistant
• Wide range of styles and qualities available

Cons

• Cost, more expensive than a polyester and polypropylene carpet of comparable quality
• Static electricity can build up unless treated with anti-static material
• Not as soft as polyester, although technological advances are improving the feel of all synthetic carpet fibers
• Not inherently stain-resistant unless treated; nylon is very absorbent but can be manufactured with a stain-resistant treatment

Polyester

Strata from spain&#;s rols carpets | 100% recycled PET polyester

What is it?

A synthetic fiber family used in the manufacture of both residential and commercial carpets. Sometimes made from recycled materials, polyester fibers are soft and hold vibrant color well.

Also Known As

PET, rPET, poly silk

• PET, or polyethylene terephthalate, is a polyester fiber made from recycled plastics (e.g., water bottles).
• rPET is specifically designated when the PET fibers are 100% made from recycled plastics.
• Poly silk is a manmade polyester fiber with a soft texture and a silk-like sheen. It does not absorb moisture and is mold and mildew-resistant.

Pros

• Contract Grade: polyester carpets are becoming increasingly more durable and appropriate for busy commercial settings
• Colorfastness: excellent color clarity and retention
• Stain-resistance: resists water soluble stains
• Outdoor friendly: some recycled PET polyesters are approved for outdoor use. Check specifications to be sure that the backing and/or the border (on a rug) is appropriate for outdoor-use.
• Feel: softer touch than nylon and polypropylene, although technological advances are improving the feel of all synthetic carpet fibers
• Affordable
• Wide range of styles and qualities available

Cons

• Not all polyester carpets are rated for heavy commercial use
• Less resilient and fibers will compress over time 
• Not as durable as nylon and may have to be replaced more frequently in busy areas

Polypropylene

perth polypropylene dining room rug in driftwood from the terasa collection

What is it?

A synthetic fiber used in the manufacture of both residential and commercial carpets. It is a long chain polymer composed of ethylene, propylene or other olefin units, and accounts for about a third of carpet face fibers in commercial carpeting.

Also Known As

PP, Olefin

• PP is shorthand for polypropylene 
• Olefin is the generic name for polypropylene

Pros

• Contract Grade: not all polypropylene carpets are contract grade&#;it depends on the backing and the quality of the fibers. If the polypropylene carpet does not have a backing, then it is not contract grade. Unbacked polypropylene carpets are particularly great for outdoor residential settings. A backed polypropylene from the Terasa collection is commercially rated as well as outdoor friendly.
• UV-resistance: yarns are colorfast and resist fading, even in sunlight
• Outdoor friendly: polypropylenes are great for outdoor use. Check specifications to be sure that the backing and/or the border (on a rug) is appropriate for outdoor-use.
• Anti-static: generates low levels of static electricity
• Favorably priced
• Hydrophobic: polypropylene is impervious to moisture, making it mold, mildew, moisture and stain resistant 
• Solution dyed yarns mean polypropylene is very stain-resistant and fade-resistant

Cons

• Not all polypropylene carpets are rated for commercial use
• Not as durable as nylon and polyester. However, construction plays a major role in longevity&#;a tightly woven, flat weave polypropylene carpet like Brisbane is very durable compared to a loose textured polypropylene carpet. 
• Oleophilic: not soil resistant and attracts oil-based dirt
• Not as abrasion resistant as nylon

A Note on Sustainable Synthetic Fibers

Contact us to discuss your requirements of polypropylen fiber. Our experienced sales team can help you identify the options that best suit your needs.

Consumers who want the durability of synthetic but also care about sustainability look for cutting edge fibers like ECONYL® and PET instead of virgin nylon or polyester. As with all new and emerging technologies, the product cost can be a barrier. But as the industry moves toward greener carpet production, costs will decrease while the benefits for all increase.

In the meantime, if natural is your preference, there are options. Consider durable, natural fibers like sisal but be sure to check the backing&#;some natural carpets have a synthetic backing. For example, Sisal Tiles are tough, woven from natural sisal, but have a synthetic backing for added durability. Also, stain-resistant sisal rugs carry a contract-grade rating but the yarns are coated with a stain-resistant treatment. For completely natural options, look at our Pure Wool or Jacaranda collections&#;biodegradable and/or renewable fibers with contract-grade choices.

Interested in natural fibers like sisal, jute or seagrass?

Head over to What is the Difference between Sisal, Seagrass, Coir, Jute and Abaca? to learn about these fibers and where to use them.

Shop natural

Nylon vs. Polyester vs. Polypropylene Comparison Chart

Always check the specifications for the carpet or rug you are considering. Synthetic fibers are manufactured to meet different needs and end use applications&#;one nylon carpet might have UV-resistant yarns but only a residential use rating, while another may have also UV-resistant yarns but a contract grade rating.

The comparison table below primarily references high quality, contract grade versions of these fiber types and assumes the yarns are solution-dyed, UV-resistant, and have some level of stain-resistant treatment.

*  = Good, ** = Great, *** = Excellent

$ = least expensive, $$ = more expensive, $$$ = most expensive

NYLONPOLYESTERPOLYPROPYLENEDurability*******Resiliency******Ease of Cleaning********Stain Resistance********Soil Resistance******Anti-Static*******ColorfastYesYesYesUV-ResistantYesYesYesOK for Pets?YesYesYesOutdoor Use?NoMaybeYesAnti-Microbial**YesYesYesEco-Friendly Option?ECONYL®PET&#;Cost$$-$$$$-$$$-$$Range of Styles & QualitiesYesYesYesUse ApplicationHeavy Commercial, Hospitality, ResidentialCommercial, Hospitality, ResidentialCommercial, Hospitality, Residential** Synthetic carpet fibers are generally resistant to moisture and mold growth, making the growth of bacteria more difficult. High quality and/or commercially rated fibers are usually treated with an anti-microbial product. Check technical specifications.

Common Characteristics For Synthetic Rugs

synthetic synsisal® yarns ready for the loom

Tufted or woven, low pile or high pile&#;these are just a few examples of common attributes used to describe rugs and carpet. The construction or final pile height of a carpet often dictates its use&#;a hand-loomed carpet will not hold up well in a busy, commercial space and a carpet with a plush, high pile is best for residential settings. Let&#;s go over a few carpet basics:

Tufted

Tufting is the fastest method of carpet production and most carpet on the market today is tufted. A tufting machine is like a giant sewing machine, with hundreds of needles stitching or punching the pile yarn (or face yarn) through a primary backing. A tufted carpet can have a variety of finished pile styles, like loop, cut and loop, multilevel loop, or plush. 

Woven

A woven carpet is made on a loom, either machine or manually operated, and does not have knots. Instead, the stability of the weave depends on the interlacing warp and weft yarns. The pile yarns or face yarns and backing yarns are woven simultaneously. A woven carpet can have loops or cut piles, or be flat woven.

What is a flat weave rug or carpet?

A flat weave rug is made via the same process as a woven rug, with interlacing warp and weft yarns forming the dimensionality of the weave. But instead of loops or a pile height, the yarns are pulled tight and low, creating a flat surface. 

Some flat weave rugs do not have a backing. For example, many polypropylene rugs are flat woven and not backed and ideal for residential outdoor use. Natural fiber rugs like sisal or seagrass are flat woven and have a latex or jute backing. Lastly, there are many synthetic flat weave rugs that have a durable backing and a tight, flat surface, making them a great choice for busy households or commercial settings with heavy traffic.

comparison of construction: image on the left shows a tight, flat weave carpet with low pile height & the image on the right shows a tufted, cut pile carpet with high pile height

Pile Height

Pile height refers to how tall the carpet fiber or face yarns are and is an important consideration in commercial settings or residential settings. For example, a higher or more plush pile is great for a luxurious vibe, but may not comply with ADA regulations or may block clearance in a doorway. In general, contract environments require low-pile carpets that are easy to navigate over and keep clean.

High Pile vs. Low Pile

No matter the construction, all carpets have a pile height. A low or short pile carpet has very short fibers or tufted low level loops. High pile carpets have larger loops, multi-level loops, or cut fibers that are kept long for a more dense cushion. Since pile or face yarns represent the majority of the material cost of carpet, be sure you are specifying the right height for your project. The higher the pile, the more difficult it can be to clean.

A Word About Carpet Padding

The under pad or underlayment for any wall-to-wall carpet installation or area rug makes a positive impact on comfort level, sound absorption, and the overall lifespan of your floor covering. 

• For area rugs, a carpet pad stabilizes the rug in place while adding a cushioned layer. Keep in mind the thickness of the pad&#;the thicker it is, the more likely it creates a tripping hazard.
• For wall-to-wall installations, rely on the expertise of your professional carpet installer.
  • When installing flat weave carpeting, the underlayment or carpet padding should be dense and not too cushy or thick which can compromise seams.

Installing a Flat Weave Carpet?

From planning the project to handling seams properly, we have all you need to know about flat weave carpet installation, including tips, tricks, and hands-on videos.

learn more

Final Words

In conclusion, synthetic fibers like nylon, polyester, and polypropylene are great options for contract settings or if you are looking for a cleanable, durable floor covering. Nylon reigns supreme in regards to overall performance: heavy contract ratings, high resiliency, cleanability, and longevity. But a polyester or polypropylene carpet carries many of the same credentials, like contract ratings, durability, and cleanability, potentially at a lower price point. And with the advent of regenerated yarns, a greener story is possible for all synthetic rugs.

FAQ

When would I not use a synthetic flat weave carpet?

If you are considering a flat weave carpet for an inset, extra consideration is required. Flat weave carpet construction requires all open or cut edges to be sealed with a seam sealer to prevent fraying. Additionally, in an inset application, the use of a transition or schluter strip further protects a flat weave carpet&#;s edges and helps prevent the risk of sprouting or fraying. If the inset application does not use transitions or schluter strips, a flat weave carpet may not perform well.

Can a synthetic flat weave be used outdoors?

Always check the technical specifications for the carpet you are considering. With the proper backing, polypropylene and poly silk fibers can be used outdoors. Unbacked polypropylenes, the Rols Collection or Terasa rugs are particularly great for residential outdoor settings. 

What are the common commercial classifications for synthetic rugs?

Whether it is a retail shop or a hotel lobby, it is important to understand commercial carpet classifications so you can select the best carpet for the project. Our helpful Carpet Classifications Guide talks about durability ratings, fire ratings, and some of the organizations that establish the ratings.

Are synthetic carpets considered low VOC?

VOC stands for &#;volatile organic compound&#; and in this context, it refers to a rug or carpet&#;s off-gassing&#;how much VOC is released from the product? A carpet made from virgin synthetic (i.e., petroleum) materials will off-gas more than a natural product. Comparatively, regenerated synthetic fibers like ECONYL® and PET have lower VOCs.  For those looking for low VOCs in a commercial carpet, we recommend SynSisal® or our selection of synthetic sisals woven from nylon. For a completely natural option, our Pure Wool or Jacaranda collections have no to low VOC contract-grade options.

Could I use synthetic carpet tiles instead of carpet?

It depends on the end use and your preferences. Carpet tiles offer many benefits over broadloom carpet and may be easier to install. Carpet tiles, whether synthetic or natural, are versatile and often budget friendly. To learn more about carpet tiles vs. carpet, head over to Carpet vs. Carpet Tiles: Choosing the Right Flooring Option.

How do I clean my polypropylene or nylon carpet?

You want to protect your investment and routine care and maintenance is a must. Most important is regular vacuuming, but for more information on caring for your synthetic rug, check out our High Traffic Area Rug Guide for tips on treating stains and more.

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