Low Molecular Weight PE Wax: Improving Flow and Demolding in PVC Extrusion

PVC processing requires precise control over lubrication and melt behavior. Low molecular weight polyethylene (PE) wax plays a crucial role as both an internal and external lubricant, improving melt flow, surface quality, and demolding performance in extrusion and injection processes.

During PVC extrusion, friction between polymer chains and metal surfaces generates excessive heat and pressure, leading to poor flow and surface defects. The addition of low molecular weight PE wax reduces internal friction by improving polymer chain mobility. At the same time, its external lubrication effect minimizes adhesion between molten PVC and metal surfaces, ensuring smooth release during demolding.

Unlike paraffin waxes or stearates, PE wax exhibits higher thermal stability and a consistent melting point, making it suitable for high-temperature extrusion of rigid PVC profiles, pipes, and sheets. It enhances flow uniformity and prevents die build-up, which improves both production efficiency and product appearance. The wax also contributes to better gloss and surface smoothness, key factors in aesthetic and mechanical quality.

In rigid PVC formulations, the recommended dosage typically ranges from 0.5% to 1.5%, depending on the system. It can be combined with calcium stearate or ester wax to achieve a balanced lubrication profile. The synergy between internal and external lubrication improves not only extrusion speed but also dimensional stability and mold release.

Low molecular weight PE wax also helps optimize energy consumption by reducing torque and processing temperature. This contributes to more stable operations, less wear on processing equipment, and consistent product quality across batches. Its performance advantage has made it a preferred choice among PVC compounders and processors seeking both productivity and quality enhancement.

As PVC processors pursue higher productivity and smoother extrusion, low molecular weight PE wax stands out as a key additive for stable and efficient operation.
Reach out to us today to discuss your PVC formulation needs — our technical specialists can help you select the right wax grade to enhance your process stability, reduce costs, and improve end-product quality.