What is capped WPC and how it’s made

capped wpc offers enhanced water and moisture barrier
What is capped WPC and how it’s made

WPC manufacturing : what is capped wpc and how is it made?

Wood plastic composite manufacturing processes and technology have significantly evolved these last 30 years. The latest technological advance aims at fighting colonization by decay fungi, in a word, mold, and rot. It translates into a new but mature process called “capping”. In what capacity capped wpc is an improvement and how is it made are the subjects we cover today.
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What is “capping” in wood plastic composite manufacturing?

Capping is a general term that describes the outer layer extruded to enclose the wpc products in wood plastic composite manufacturing. Capping is usually polymeric in nature and protects the wood flour core of the wood plastic composite product.

capped wpc deck vs non capped wpc deck plank


Overall improvement


Increased water barrier


Better color resilience


Improved stain-proofing

Why is “capped wpc” now became the industry’s standard?

Capping technology of wpc products enables w.p.c manufacturers to cater more durable, less demanding and better-looking wood plastic composite products than before.

Capping prevents water to penetrate the core, and by that, prevents colonization of decay fungi. Which means that a capped w.p.c is theoretically going to last longer than an ordinary non-capped w.p.c product when exposed to elements. It is a great leap forward in wood plastic manufacturing since distributors and sellers insist on the durability of the product compared to wood.

Capping helps prevent color fading, by incorporating elements that protect the pigments from UV. Capping material can be mixed so its chemical properties evolve and lessen the impact of UV rays on the wood plastic composite product. It is the second biggest improvement for end users.

Capping increases stain-proof performances, because of its chemical composition. Capping materials are known to be of polymeric nature, which decreases the possibility of stains while maintaining a nice and easy-to-clean finish.

With capping comes embossing, which means that even a wood plastic composite deck or cladding plank can look like wood. Not only this allows for a new addition to the distributor’s range of finishes, but it most importantly helps to convert end users to wood plastic composite decks and cladding.

capped wpc machinery

How are wpc products “capped”?

The process of capping takes places on the same line as extrusion of the wpc profile. It is an added step that covers the various faces of the profile to form a protective layer. The substrate is fused with around the wood plastic composite product. It forms a durable outer layer, preventing water or humidity to penetrate the wood plastic composite core.

While capped wpc offers many perks, it comes with a price. Indeed, to each quality improvement, generally equals a rise in costs. Plus, improved decking planks and increase in prices have not been a obstacle to the growth of the industry. On the contrary, masses such as American end users are pushing for better, more versatile and especially maintenance-free solutions to their decks. Plus, it helps fight against deforestation and support recycling.