Paneles murales de compuesto de madera y plástico (WPC) 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 fibras de madera y polímeros plásticos, reinforced with stabilizers, colorants, lubricantsy 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% impermeable
Formaldehyde level	Alta	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)

Calcium Carbonate (CaCO₃)

Stabilizers

Color Masterbatch

Lubricants

Functional Additives (Fire retardants, UV absorbers, impact modifiers, etc.)

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:

• Excelente impermeabilidad
• 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
• Excelente impermeabilidad
• 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	Aplicación
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:

• Densidad
• 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.

Conclusión

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

High-quality WPC wall panels are made from:

• A-grade wood/bamboo fiber
• Virgin PVC resin
• 1250-mesh CaCO₃
• Eco-friendly stabilizers
• Functional additives (UV, fire, waterproof)

As a China WPC wall panel manufacturer & exporter, we offer stable formulations, consistent quality, and full customization for B2B clients.