Sainuo - Polyethylene Wax Manufacturer and EBS Wax Supplier since 2005  

Polypropylene Wax for Wood Plastic Composites: Dosage and Effects

by:Sainuo     2023-11-18


Polypropylene wax is commonly used as an additive in wood plastic composites (WPC) to improve their properties. In this article, we will discuss the dosage and effects of polypropylene wax in WPCs. Five key aspects will be covered in this article to provide a comprehensive understanding of the subject matter.

1. The Role of Polypropylene Wax in WPCs

Polypropylene wax is an important component in the formulation of wood plastic composites. It is primarily used as a processing aid and a lubricant. The addition of polypropylene wax reduces friction between the polymer matrix and the wood fibers, which facilitates the blending and extrusion processes. Additionally, the wax improves the flow and dispersion of the composite during molding, resulting in better surface quality.

2. Dosage Optimization of Polypropylene Wax

Determining the optimal dosage of polypropylene wax in WPCs is crucial to achieve the desired properties without compromising cost-effectiveness. Several factors, such as the type of wood fibers, matrix polymer, and processing conditions, influence the ideal dosage. Careful consideration of these factors is necessary to maximize the benefits of using polypropylene wax while minimizing potential drawbacks.

3. Effects on Mechanical Properties

The addition of polypropylene wax affects the mechanical properties of wood plastic composites. By reducing friction between the components, it improves the flowability during processing and enhances the interfacial bonding between the wood fibers and the polymer matrix. This results in improved tensile strength, flexural strength, and impact resistance of the WPCs. However, an excessive amount of wax may negatively impact the mechanical properties, highlighting the importance of dosage optimization.

4. Influence on Thermal Properties

Polypropylene wax also influences the thermal properties of WPCs. Its addition improves the heat resistance of the composite, making it less prone to deformation or degradation at elevated temperatures. The wax forms a protective layer around the wood fibers, preventing them from oxidation or thermal decomposition. This property is particularly important for applications where WPCs are exposed to high temperature conditions.

5. Impact on Microstructure and Water Resistance

Polypropylene wax has a significant influence on the microstructure and water resistance of wood plastic composites. The wax facilitates better dispersion of the wood fibers within the polymer matrix, leading to a more homogeneous structure. This, in turn, improves the water resistance of the composite, reducing the likelihood of swelling, warping, or rotting. Additionally, the wax acts as a barrier against moisture penetration, further enhancing the durability of the WPCs.


Polypropylene wax plays a vital role in improving the properties of wood plastic composites. By acting as a processing aid and a lubricant, it enhances the blending, extrusion, and molding processes. Dosage optimization is crucial to ensure the desired mechanical, thermal, and water resistance properties of the WPCs. Careful consideration of the specific application, as well as the type of wood fibers and matrix polymer, will facilitate achieving the desired outcomes. Overall, the addition of polypropylene wax is an effective strategy to enhance the performance and durability of wood plastic composites.

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