News_Novista Chemicals - The pioneer of Flame retardant

19 2025-5
How to Improve the Surface Gloss of PVC-U Pipes and Profiles?-2 2.2 Mold Cavity Surface Precision The surface finish of the mold cavity directly determines product gloss: - Polishing to a roughness ≤Ra 0.2 μm is standard. - Electroplating the cavity improves gloss and extends mold lifespan.
19 2025-5
How to Improve the Surface Gloss of PVC-U Pipes and Profiles?-1 The surface gloss of UPVC products is influenced by factors such as formulation, raw materials, molds, and processing during production. To achieve superior surface gloss, it is essential to comprehensively address these constraints through rational control of all aspects.1. Factors Affecting Surface Gloss 1.1 Formulation and Raw Materials
15 2025-5
Comparison of PVC Resin Production Processes OverviewAmong the two main raw-material routes for PVC resin production—the ethylene route and the calcium carbide route—each has its own strengths and weaknesses.
14 2025-5
Common Issues and Solutions in Pipe Production Using Calcium-Zinc Heat Stabilizers A. Raised Blotch-Like Protrusions on the Pipe Wall (Bubble-Like)Possible Causes
29 2025-4
Brief introduction of PVC-DWV foam core pipes-5 6.Precautions(1) The inner and outer skin layers and the foamed core layer materials of the PVC core foamed pipe should be mixed in two high-speed mixers respectively.(2) Before production, the uniformity of the assembly gap between the die and the core rod in the molding mold should be carefully adjusted. When the gap is uneven during production and affects the wall thickness, …
29 2025-4
Brief introduction of PVC-DWV foam core pipes-4 3.2 Reference formula based on Ca Zn stabilizer:‌A. Inner/outer layer formula (SG-5 resin) - PVC resin: 100PHR - Ca zn stabilizer: 6.5PHR
29 2025-4
Brief introduction of PVC-DWV foam core pipes-3 (6) Since the density of the middle foam layer is only 0.7-0.9g/cm3, which is 10%-35% lower than that of ordinary solid wall pipes, the larger the diameter of the pipe, the greater the proportion of the foam core layer to the wall thickness, and the more material is saved. On average, PVC-U core foam drainage pipes with the same wall thickness save about 25% of materials compare…
29 2025-4
Brief introduction of PVC-DWV foam core pipes-2 According to the China national standard GB/T 16800-1997 "Unplasticized polyvinyl chloride (PVC-U) pipes with a cellular core for drainage", the inner and outer solid wall layers must have good mechanical properties, such as tensile strength of not less than 43MPa, and good processing performance. Generally, SG-4 and SG-5 PVC resins are selected.When producing PVC-U co…