News_Novista Chemicals - The pioneer of Flame retardant

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…
29 2025-4
Brief introduction of PVC-DWV foam core pipes-1 PVC-DWV foam core pipes, in some places, are also called as PVC-U pipes with a cellular core for drainage.1. Introduction
29 2024-11
Influence of main indexes of chlorinated polyethylene (CPE) on modification of rigid PVC pr… Effect of CPE with different tensile strength and elongation at break on PVC modification:Tensile property is also the key performance index of CPE materials, and the tensile property of materials is characterized by tensile strength and elongation at break. The tensile properties of CPE are closely related to the raw material HDPE, chlorine content, chlorine atom distribution, …
29 2024-11
Influence of main indexes of chlorinated polyethylene (CPE) on modification of rigid PVC pr… Effect of CPE with different impurity particle number on PVC modification:Impurities in CPE usually refer to particles in CPE that are not plasticized or difficult to plasticize, such as hyperchlorinated CPE, yellow discolored particles, mixed with other material impurities, etc., which can usually be found by CPE spot pressure film test. This impurity particles exist in every m…
28 2024-11
What is ASA (Acrylonitrile styrene acrylate)? Acrylonitrile styrene acrylate (ASA), also called acrylic styrene acrylonitrile, is an amorphous thermoplastic developed as an alternative to acrylonitrile butadiene styrene (ABS), that has improved weather resistance.It is an acrylate rubber-modified styrene acrylonitrile copolymer, and can be used for general prototyping in 3D printing, where its UV resistance and mechanical p…