PU Release Agents | Yunzhu | Yunzhu New Materials

Release Agent Solutions for Automotive PU Interior Parts

An overview of four key demolding challenges in automotive PU interior parts and the specialized release agent solutions to address them.

Industry & Applications

A complete guide to the application of PU sole release agent

In the mass production process of PU / EVA / rubber / PVC soles, demoulding efficiency, surface quality, environmental compliance and cost control have always been the core issues that shoe material manufacturing companies are most concerned about.

Troubleshooting & Solutions

Mold Fouling in PU Production: Causes and Fixes

In continuous polyurethane (PU) foam production, mold cleanliness is a critical factor that directly impacts product appearance, production efficiency, and overall manufacturing cost. Whether in shoe soles, automotive interior integral skin parts, seating cushions, or industrial components, manufacturers inevitably face a common challenge at scale — **mold fouling**. Once deposits accumulate on the mold surface, they lead to difficult demolding, increased defect rates, and more frequent downtime for cleaning. Over time, this disrupts production flow and affects delivery reliability. This article provides a systematic analysis of the root causes of mold fouling in PU production and offers practical, industry-proven solutions to help manufacturers achieve **stable demolding, lower defect rates, and extended mold life**.

Industry & Applications

PU Foaming Technology：Principles & Applications

With the continuous advancement of materials engineering and industrial manufacturing, lightweight, high-performance, and functionally integrated materials have become key development trends across industries. Polyurethane materials, known for their high design flexibility and wide performance adjustability, show outstanding value in foaming applications. Polyurethane foaming technology enables weight reduction and energy efficiency while maintaining excellent mechanical properties, and plays a critical role in industries such as automotive, construction, electronics, and sports equipment. This article provides a systematic overview of the basic principles, production processes, and typical applications of polyurethane foaming technology in composite materials, helping readers better understand its technical characteristics and industrial prospects.

Industry & Applications

High-Resilience PU Foam Defects & Solutions for Automotive Seats

High-resilience polyurethane (HR PU) foam has become the most widely used foaming material for automotive seats and headrests due to its excellent comfort performance and cost efficiency. However, in actual production, factors such as raw material quality, process parameters, mold condition, and release agent selection often lead to defects including shrinkage, collapse, surface defects, tearing, and delamination, directly affecting seat appearance and overall quality. This article analyzes the manufacturing process of automotive PU foam, summarizes common defects in high-resilience polyurethane foam production, and provides practical solutions focusing on process optimization and PU foam release agent selection.

Technical Guides & Know-How

PU Release Agent Guide: How to Prevent Sticking, Cracks, and Surface Defects in Shoe Sole Molding

Why PU Shoe Sole Molding Often Fails at Demolding Polyurethane (PU) shoe soles are widely used in the global footwear industry for their flexibility, durability, and comfort. However, many manufacturers face recurring production problems—especially during the demolding process. Issues such as sticking, cracks, surface whitening, and bubbles can significantly reduce product quality and increase scrap rates. In most cases, these defects are not caused by the mold or the PU formulation itself, but by incorrect release agent selection or improper application. This guide explains the most common demolding problems in PU shoe sole molding and provides practical advice on how to choose and apply the right PU release agent for stable, defect-free production.