News_Novista Chemicals - The pioneer of Flame retardant

19 2026-3
Yellowing of PVC in Construction Applications: Causes and Mechanisms PVC materials are widely used in the construction industry. However, yellowing remains a persistent issue. To effectively address this problem, it is essential to understand its causes, which can generally be divided into internal and external factors.I. Internal Factors
24 2026-2
The Influence of Different Lubricants on PVC Plasticization and Processing Performance I. Comparison of Different Lubricants on PVC Plasticization SpeedBased on practical experience, the plasticization speed of commonly used lubricants can be ranked as follows (from fastest to slowest):
16 2025-12
The Influence of PVC Additives on the Plasticization Process I. Concept of PVC PlasticizationPolyvinyl Chloride (PVC) resin is a thermoplastic amorphous polymer material that undergoes a transition from the glassy state → highly elastic state → viscous flow state under the combined action of temperature and shear force. From a rheological perspective, the plasticization of PVC precisely refers to this state transition process.
4 2025-12
Discussion on PVC Processing and Gelation (Plasticization) Impact of Gelation Degree on Product PerformanceThe performance of PVC products is closely related to the degree of gelation during processing. Insufficient gelation results in brittle products with inadequate mechanical properties, while excessive gelation may cause yellow lines and also lead to poor mechanical performance. Therefore, gelation degree is one of the most critical…
1 2025-12
Formula and Process Design for High-Rigidity, Low-Density PVC Wood-Plastic Foam Boards Polyvinyl Chloride (PVC)-based foam boards were initially used primarily in fields such as advertising cabinets and bathroom vanities.However, traditional PVC foam boards suffer from two major drawbacks: high density, which leads to excessive weight, and insufficient rigidity (low flexural modulus) coupled with a low heat deflection temperature (HDT). These limitations prevent t…
14 2025-10
Why Too Much Ca-Zn Stabilizer Can Cause PVC “Burning” Instead of Protection In PVC processing, it is often assumed that more stabilizer means better stability. However, overdosing Ca-Zn stabilizer can actually trigger thermal degradation and blackening, also known as “zinc burn.”There are four key mechanisms behind this phenomenon:
26 2025-9
How will internal and external lubricants determine product quality in PVC-U processing? Have you ever encountered problems such as rough surfaces of PVC pipes, frequent jamming during extrusion? or oil spots on food-grade PVC packaging films and substandard mechanical properties? 80% of these seemingly unsolvable production problems are rooted in the balance of the lubrication system. I. Core Functions of Internal Lubricants
8 2025-9
Classification, Mechanisms, and Applications of ACR Processing Aids In PVC processing, ACR (acrylic processing aids) are multifunctional additives that improve melt rheology, promote fusion/plasticization, and enhance melt strength.This article summarizes their classification, mechanisms of action, applications, and representative case studies.