Wood Plastic Composite (WPC) wall panels have become one of the most widely used decorative materials in modern residential, commercial, and engineering projects. Their stability, waterproof performance, durability, and aesthetic effect make them a preferred alternative to traditional wood, PVC panels, and gypsum boards.
For international distributors, construction contractors, wholesalers, and project buyers, understanding what raw materials are used to produce WPC wall panels is crucial. Raw materials determine the panel’s mechanical strength, lifespan, fire resistance, environmental performance, and overall cost.
This article provides a comprehensive and deeply professional explanation of the raw materials for WPC wall panels, including material composition, performance roles, ratios, sourcing standards, and how different formulations influence the final product quality. As a China-based WPC wall panel manufacturer, we also share our internal factory insights to help you evaluate suppliers more accurately.
Introduction: Why Material Composition is Key to WPC Wall Panel Quality
WPC is a composite material combining wood fibers そして plastic polymers, reinforced with stabilizers, colorants, lubricantsそして functional additives.
The performance of WPC panels depends heavily on:
The purity of raw materials
The ratio of wood powder to plastic
The type of plastic resin
The quality of additives
The production process
Different factories use different grades of materials, which directly affect:
Performance Factor
Low-Grade Materials
High-Grade Materials
Stability
Easy to deform
Durable & stable
Color fastness
Fades quickly
10–15 years no fading
Density & strength
Brittle
Impact-resistant
Waterproof rating
Poor sealing
100% waterproof
Formaldehyde level
高い
Eco-friendly E0 level
Price
Cheap
Better long-term value
This is why understanding raw materials is essential before importing WPC wall panels from China or other markets.
Core Raw Materials of WPC Wall Panels
WPC wall panels are mainly composed of the following:
Wood Powder (Wood Fiber / Bamboo Fiber)
Plastic Resin (PVC / PE / PP, most commonly PVC for indoor wall panels)
Below is a detailed breakdown of each raw material, its role, quality grades, and how it affects the final product.
Wood Powder: The Main Structural Component of WPC
1.What is Wood Powder?
Wood powder (or wood fiber) comes from natural wood, bamboo, or agricultural waste such as sawdust.
It is typically ground into:
20 mesh
40 mesh
80 mesh
100+ mesh
The finer the powder, the smoother the finished surface.
2.Functions of Wood Powder
Enhances rigidity and structural strength
Provides natural wood grain feel
Improves panel stability
Reduces shrinkage and deformation
Enhances screw-holding ability (important for ceiling/wall installations)
3.Quality Levels
Grade
Description
Panels Effect
A-Grade Natural Wood Fiber
Clean, no impurities
High strength, stable
B-Grade Mixed Wood Fiber
Some impurities
Average performance
Recycled Wood Powder
Low cost, low quality
Easy cracking, brittle
4.Recommended Wood Content Ratio
For indoor WPC wall panels: 40%–60% wood fiber For outdoor decking/cladding: 55%–70% wood fiber
As a manufacturer, we only use A-grade dried wood/bamboo fiber, moisture controlled below 1.5% to ensure stable extrusion quality.
Plastic Resin: Determines Waterproof and Durability Levels
Plastic resin is the second key component.
Common resins include:
PVC (Polyvinyl Chloride) → Most used for interior wall panels
PE (Polyethylene) → Mostly for decking and outdoor cladding
PP (Polypropylene) → High strength but more expensive
1.Why PVC is the Best for WPC Wall Panels?
PVC provides:
Excellent waterproof performance
Strong flame retardancy
High dimensional stability
Good bonding with wood fiber
High extrusion strength
Long service life
WPC wall panels for interior decoration are almost always PVC-based WPC.
2.Types of PVC Resin
Type
Description
Virgin PVC
Pure, highest stability, best for premium WPC panels
Recycled PVC
Lower cost, lower strength, used by cheap manufacturers
Mixed PVC
Mid-level option
3.PVC Purity Directly Affects Quality
High-purity PVC ensures:
No odor
Smooth surface
Excellent waterproof performance
Stable extrusion
Low-quality PVC leads to:
Bubbles in the panel
Poor density
Deformation at high temperature
Faster aging
4.Recommended PVC Ratio
For premium interior WPC wall panels:
PVC 25%–35%
Other Key Raw Materials: CaCO₃, Stabilizers, Lubricants & Colorants
WPC wall panels also contain several functional additives to improve performance.
1.Calcium Carbonate (CaCO₃)
Role:
Increases density
Enhances hardness
Reduces cost
Improves UV resistance
Quality Grades:
Grade
Mesh
Color
申し込み
Ultra-fine CaCO₃
1250–2000
Pure white
Premium WPC wall panels
Medium CaCO₃
800–1000
Off-white
Standard WPC panels
Low-grade CaCO₃
<400
Yellowish
Low-cost WPC products
Recommended Ratio:
15%–25% for premium panels
Factories using >40% CaCO₃ are cutting corners (panels will be brittle)
2.Stabilizers
PVC needs thermal stabilizers to prevent:
Degradation during heating
Yellowing
Surface burning
Types of stabilizers:
Calcium-zinc (Ca-Zn) — eco-friendly
Lead stabilizers — cheaper but non-environmental
Organic stabilizers — high-end option
B2B Tip:
For export to Europe, US, or Middle East markets, ensure your supplier uses Ca-Zn stabilizers to meet RoHS/REACH standards.
3.Lubricants
Lubricants ensure smooth extrusion and surface quality.
Types:
Internal lubricants
External lubricants
Composite lubricants
Their role:
Improve melt flow
Prevent machine sticking
Increase panel smoothness
Reduce friction
Low-quality lubricants cause:
Uneven color
Rough surface
Extrusion cracks
4.Color Masterbatch
Color masterbatch determines:
Panel color
Wood grain tone
UV resistance
Anti-fading performance
Premium masterbatch includes UV absorbers, improving outdoor stability.
For interior WPC wall panels, color consistency is extremely important. We use high-temperature resistant colorants to prevent discoloration during extrusion.
5.Functional Additives
Depending on product type, manufacturers may add:
Fire Retardants (B1-grade)
Improve fire resistance—important for hotels and commercial buildings.
UV Absorbers
Prevent yellowing and fading.
Impact Modifiers
Increase toughness and bend strength.
Waterproof Enhancers
Improve long-term waterproof stability.
Anti-Mildew Agents
Used for humid environments like kitchens & bathrooms.
Different WPC formulations lead to different performance levels, which wholesalers and project buyers must evaluate carefully.
How Material Ratios Influence WPC Wall Panel Performance
Different applications require different material ratios. Below is a table comparing typical formulations:
Application Type
Wood Fiber
PVC Resin
CaCO₃
Additives
Interior WPC Wall Panel
50%
30%
15%
5%
Luxury WPC Fluted Panel
55%
30%
10%
5%
Outdoor WPC Cladding
60%
20%
10%
10%
Low-End WPC Panels
30%
15%
50%
5%
Warning:
Low-cost factories increase CaCO₃ to reduce cost. Though panels look similar, the performance is far worse:
Cracking
Brittle feel
Easy to deform
Poor screw holding
Fading within 6–12 months
As a China WPC wall panel manufacturer, we always follow stable formulations to guarantee long-term durability.
How We Source and Control Raw Materials (Factory Strength Highlight)
As a professional WPC wall panel manufacturer, we control raw materials with strict standards.
1.Wood Fiber Control
Sourced from certified forestry suppliers
Moisture controlled under 1.5%
Mesh size adjusted by panel type
No recycled wood, no waste wood
2.PVC Resin Quality
100% pure PVC for premium panels
No low-grade recycled PVC
Complies with EU RoHS, REACH
3.CaCO₃ Quality
Uses 1250 mesh ultra-fine grade
Ensures high-density extrusion
No yellow low-grade fillers
4.Additives
Ca-Zn stabilizers
High-temperature resistance pigment
Japan-grade lubricants
UV absorbers for anti-fading
5.Testing & Quality Control
Every batch is tested for:
密度
Impact resistance
Color uniformity
Waterproof rate
Screw holding strength
Formaldehyde emission (E0-E1 Grade)
This ensures long-term stability for distributors, wholesalers, and project buyers.
How to Evaluate a Supplier’s Material Quality
Before importing WPC wall panels from China, ask the supplier:
✓ 1. What is the wood-fiber percentage?
Must be above 40%.
✓ 2. Do you use virgin PVC or recycled PVC?
High-end products = virgin PVC.
✓ 3. What CaCO₃ mesh size do you use?
Premium = 1250 mesh.
✓ 4. Do you use Ca-Zn stabilizers?
Required for EU/US markets.
✓ 5. Is formaldehyde emission E0/E1 level?
Eco-friendly for indoor use.
✓ 6. Do you provide raw material test reports?
Helps verify authenticity.
✓ 7. Can you provide samples from different batches?
Ensures consistency.
結論
Understanding the raw materials of WPC wall panels helps you:
Select high-quality suppliers
Avoid low-cost low-quality products
Improve your project durability
Reduce after-sales problems
Build a more reliable product line for your market
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