In terms of building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, and fibers, PVC was the world`s largest production of general-purpose plastics, and its applications are very widely. Widely used in all aspects.
PVC is a white powder with an amorphous structure. The degree of branching is relatively small. The relative density is about 1.4. The glass transition temperature is 77~90°C. It begins to decompose at about 170°C. It has poor stability to light and heat. After prolonged exposure to sunlight, it will decompose to produce hydrogen chloride, and further automatically catalyze the decomposition, causing discoloration, and the physical and mechanical properties also rapidly decline. In actual applications, stabilizers must be added to improve the stability of heat and light.
the Degree of polymerization of SG5 is 1000. usually we also call PVC Resin S1000. Its K-value is K67.
PVC RESIN SG5,Polyvinyl Chloride,Polyvinyl Chloride SG5,PVC Resin K67 Henan Shunbang Chemical Industry CO.,Ltd , https://www.pvcresinchemical.com
Shanxi Metrology Institute's scientific and technological research project won the third prize of Shanxi Science and Technology Progress Award
China Instrument Network Instrument R&D Recently, the Shanxi Provincial People's Government announced its decision on the 2017 Shanxi Science and Technology Award (Jin Zheng Fa [2019] No. 5). The project titled "Application Research on Calibration Method of Chemical Oxygen Demand (COD) Online Monitoring Equipment" was awarded the Third Prize in the Shanxi Science and Technology Progress Award. This achievement was led by the Shanxi Science and Technology Department and carried out under the supervision of the Shanxi Metrology Institute.
The research focused on developing a practical calibration method for COD online monitoring equipment, based on national metrology standards and real-world application scenarios. By using high-purity glucose as a reference material, the project successfully established traceability for low-range COD monitors. The method was tested across multiple industries to ensure its reliability, leading to the creation of a systematic and standardized technical guideline.
The results have been widely adopted as local metrology specifications in Shanxi Province, enabling full coverage of on-site calibrations for COD online monitoring devices. This not only supports the improvement of national metrological standards but also provides essential technical support for the legal management of environmental monitoring. The project has great potential for broader application and has reached a level of excellence within China.
(Original title: The research project on the calibration method of chemical oxygen demand (COD) online monitoring equipment in our research project won the third prize of Shanxi Science and Technology Progress Award)