Plastic Injection Molding with PVC Compound: Problems and Solutions

Plastic injection molding is a popular method of producing plastic parts and components, and PVC compounds are a common material used in this process. PVC compounds are known for their versatility, durability, and ease of processing, making them a popular choice for many applications. However, like any material, PVC compounds also have their own set of challenges that must be addressed in order to ensure the success of the injection molding process. In this article, we will discuss some of the common problems associated with plastic injection molding using PVC compounds, as well as the solutions to overcome these challenges.

Some injection molding products made from PVC compound

Problem 1: Warping and Shrinkage

One of the most common problems faced in plastic injection molding using PVC compounds is warping and shrinkage. This can occur due to uneven cooling rates or a mismatch between the thermal expansion coefficients of the material and the mold. As a result, the parts produced may have a distorted or irregular shape, leading to rejected parts and increased production costs.

Solution: To overcome this challenge, it is important to carefully control the mold temperature, mold filling pressure, and cooling time. Additionally, it may be necessary to modify the mold or use a different PVC compound with better shrinkage properties.

Problem 2: Poor Surface Finish

Another common challenge in plastic injection molding using PVC compounds is poor surface finish. This can occur due to a variety of factors, including improper mold design, poor material selection, and improper processing conditions. Poor surface finish can lead to increased production costs and reduced product quality.

Solution: To achieve a high-quality surface finish, it is important to optimize the mold design, select the appropriate PVC compound, and control the processing conditions. This may involve using a combination of different molding techniques, such as mold polishing or surface treatments, to achieve the desired finish.

Problem 3: Excessive Wear on Molds

Injection molding using PVC compounds can lead to excessive wear on molds, particularly in high-volume production environments. This can result in increased production costs, reduced production efficiency, and a decrease in product quality.

Solution: To minimize mold wear, it is important to select the appropriate PVC compound and processing conditions, and to optimize the mold design to minimize friction and wear. Additionally, it may be necessary to implement regular maintenance procedures to ensure that the molds are in good working condition.


Plastic injection molding using PVC compounds can be a challenging process, but with the right approach and attention to detail, it can be a highly effective and cost-efficient method of producing high-quality plastic parts and components. By addressing the common problems associated with this process, manufacturers can reduce production costs, increase production efficiency, and ensure that their products meet the high standards required for their specific applications.

At US Masterbatch JSC, we understand the importance of high-quality PVC compounds in the injection molding industry. That’s why we strive to provide the best possible solutions to meet the demanding requirements of our clients. Our company has invested in the latest technology and has built a state-of-the-art laboratory equipped with modern testing equipment. This allows us to thoroughly test our PVC compounds on various parameters such as surface hardness, specific gravity, melt index, tensile strength, color matching, and extrusion, ensuring that our products meet the highest standards of quality. Whether you are in need of PVC compounds for small or large-scale production, we are dedicated to providing the best solutions that meet your specific needs.

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