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Foaming and quality grades of WPC vinyl core layer


For improving mechanical property, reducing density and costs of raw material, micro-cellular foaming technology becomes the first choice of improvement measures.

After foaming, the content of plastic resin can be cut in half, the cellular structure of WPC rigid core is successful in preventing crack growth, thus improving impact resistance and ductility dramatically. Besides, the density of composite by foaming was obviously reduced. With the 1.5% foaming agents added, the density was reduced by 17% and the impact strength was increased by 20%. And a more precise dimension can be achieved by foaming.

However, foaming performance of WPC vinyl floor is impacted by many factors, such as the choice of plant fibre, grain diameter and content of plant fibre, foaming temperature etc.. We’ve met several foam structures from different suppliers, which could be different in content of plant fibre, plastic resin and foaming agent:

wpc vinyl flooring inspection

1. 2. 3.

4. 5.

Pic.1 Different Foaming Results

These pieces of WPC vinyl flooring are a bit different in density, ductility, tensile strength, impact strength, shrinkage and water absorption. Surely that the flooring performance would not be the same either.

In WPC vinyl flooring, half the cost comes from plastic resin, that is, increasing plant fibre will result in reducing cost. But, it is not unlimited. In China, the plant fibre reaches to about 50-60%, and 80% is the highest value that accomplished as we known.

We know that, the added of chemical foaming agent results in an increase of voidage. However, this increase of voidage will cease when the amount of foaming agent reaches a specified level.

In addition to the above situation, we found a regrettable thing in our inspection that, a few WPC vinyl flooring suppliers use quite a little regrinding resin to replace virgin material, and the share of regrinding material is getting more and more. Here are some comparison pictures, which are showing the differences clearly.

Virgin vinyl material Regrinding PVC material

Pic. 2  Virgin Material (Left) and Regrinding Material (Right)

Pic. 3  Comparison Between WPC Vinyl Flooring Cores with

Regrinding Material and Virgin Material

In Picture 3. from left to right, there are WPC vinyl flooring cores that made from 100% virgin material, 50% virgin material and 50% regrinding material, and 20% virgin material and 80% regrinding material. We compared those and found that:

1. No matter how much the regrinding material is, it is definitely darker than virgin one cause there are many colors of reclaimed PVC inside.

2. Regrinding material is weak in buckling strength and tenacity. Conversely, Virgin material is quite flexible and much more excellent in compression resistance.

3. Unlike regrinding material, the fractured side of virgin core is clean without broken bits.

4. The foam structures of virgin material core and regrinding material core are nearly no difference.

About Us

Global ZX Floor Doctor Limited Professional China Floor Inspector We focus on floor inspection only! After high school, Peter Zhang (President of Global ZX Floor Doctor Limited) directly went into foreign trade for 5 years. This trade normally has nothing to do with the inspection work, but it led to his first connection with import/export business, and made him know clearly about the different desires of international buyer and seller. From 1995, Peter started to run flooring export business of his own in China, called “New Century company”. The export volume of this company was in the top three of local area since 2003. This experience also introduced many important friends with sparkling ideas to us. And in 2012, our factory “VGreen flooring” was first founded. In this capacity, our team not only saw how flooring was made but also many manufacturing defects, which are crucial to the flooring buyers and the final use of terminal consumer. With sense of responsibility, the thought of “find a way to help foreign buyers reduce import risks” was inspired among us. A reliable friend of Peter, whom own his flooring wholesale mall in Russia called Michael suggested, “a professional inspector or quality control manager in China locally is what I am looking forward to, that may ease burden and save my time.” This great idea is quite a proper answer and very specific to our long-time preoccupation----all clouds were dispelled, thus Global ZX Floor Doctor Limited Company (A.K.A. CFI) is ready to be born. As an independent third-party, we chose Hongkong, a neutral and open city, as our basement to offer the international flooring services. Over the past 20 years worked in flooring field, the crew  have learned deeply inside the China flooring Industry and maintained communications with hundreds of Chinese floor factories and suppliers that involving various kinds of flooring, such as bamboo, hardwood, laminate, engineered, WPC, SPC, etc. With advanced management system, professional training and long-term contact with Chinese flooring suppliers, the team of Global ZX Floor Doctor is mainly specialized in “flooring inspection of origin” and “flooring field advisor”. With efforts of more than 20 professional Project Managers, our services of inspection and advisor are available for flooring importers, distributors, contractors, architects all over the world; or anyone on the globe concerning a flooring import business with China. CFI SPECIALIZES IN FLOORING INSPECTION CFI inspectors will examine the floor factory, carry out your order specifications, inspect random units and identify defects. You are in control of the whole processes through our constantly updated reports on quality and producing progress. Onsite Monitoring CFI personnel are available to monitor production at your floor supplier factory to ensure all customer requests of quality are full satisfied. Customized floor Inspection Options CFI strictly assist in customized inspection criteria to meet your special requirements. Detailed Inspection Report CFI personnel will submit detailed flooring inspection report on specification and models, assembled appearance, T&G deformity, color variation, moisture content, coating adhesion etc.. Various floor styles inspection We can handle most types of flooring: Bamboo floor, Hardwood floor, Laminate floor, Engineered floor, Outdoor Decking, WPC floor, LVT, Cork and floor accessories.

Global ZX Floor Doctor China Floor Inspection
Along with the increasing global trade needs, and supply chains get more and more complex. Floor buyers of brands, retailers and importers are urgently need to strengthen the communication with their manufacturer around the globe. Our target on Flooring Inspection is to make this process much more easier for our clients to control over the quality and seize more latest information of China flooring industry by our services. CFI would like to be your eyes in China floor factories, we do hope to be your best valuable partner in Flooring Industry of China.


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