China PVC brand name is usually used polymerization degree or model annotation. For example, seven type PVC (brand S-800, SG-7) or eight type PVC (brand S-700, SG-8) with good quality will be marked differently by different manufacturers. Most of them are marked with SG and single digit to represent PVC models. The number of hundreds and thousands marks represent the degree of polymerization (the same number represents the same product, such as Qingdao Haijing HS1000, Shanghai chlor-alkali WS1000, Qilu Petrochemical S1000 all represent five-type PVC).
The COMPARISON THAT DOMESTIC AREA DOES TRANSPARENT SHEET MATERIAL USES MORE 7, 8 TYPES, WHAT USE COMMONLY IS QILU PETROCHEMICAL, Shanghai CHLOR-ALKALI, CANG HUA, Qingdao HAI JING, DAGU HUA’S PRODUCT.
Some new and interested partners may ask why the sheet manufacturers prefer to use Type 7 and type 8 instead of type 5. No other, but seven, eight type PVC polymerization degree is low, easy to process. Not only sheet, PVC pipe fittings, PVC valves are also suitable for use.
Pipe factories usually use type 5. A high proportion of calcium carbonate was also added to reduce costs, which should not be detailed here.
In those terrible years, PVC in our country was divided into eight types, namely type 1 to 8. The eight brothers were tested (ravaged) by the market, and only four remained:
Type 3 (polymerization degree 1300, mostly used for manufacturing wire and cable, calendering film), type 5 (polymerization degree 1000, mostly used for profiles, pipes), and type 7 eight.
Mainstream PVC manufacturing using suspension method, on the selection of different suspension dispersant, can be obtained particle structure and morphology of different two kinds of resin.
Post time: Aug-08-2022