PVC Additives: Why Are They Used, What Do They Provide?

Although PVC (Polyvinyl Chloride) is a versatile polymer, in its raw form it is difficult to process, heat-sensitive, and brittle. For this reason, in industrial production, PVC is not used alone but in combination with various additives. These additives increase the material's workability, improve its performance, and give it properties suitable for its intended use.

One of the most critical additives are stabilizers. Since PVC is prone to degradation under heat and light, it requires thermal and UV stabilizers during production and use. Lead-free, calcium-zinc, or organotin-based stabilizers preserve the color of PVC, delay degradation, and extend the product's life. Stabilizers are indispensable, especially in applications with long life expectancy, such as window profiles, pipes, and cables.

Another important group of additives is fillers. The most commonly used is titanium dioxide (TiO₂), which gives PVC whiteness, opacity, and UV resistance. Thanks to titanium dioxide, PVC profiles yellow less when exposed to sunlight and maintain their aesthetic appearance. It also improves surface quality, providing a smoother and more homogeneous appearance.

Impact modifiers are used to reduce the brittleness of PVC. They reduce the risk of cracking, especially in rigid PVC applications, and increase impact resistance. These additives play a critical role in safety and durability in door and window profiles and technical plastics.