PVC is high molecular compounds polymerized by VCM with structural element as
CH2-CHCLn,degree of polymerization usually as 590-1500.In the process of re polymerization ,affected by kinds of factors such as the polymerization process, reaction conditions, reactant composition, additives etc.it can produce eight different types of PVC
resin performance is different. PVC resin is white powder or pellet.
TYPE | SG1 | SG2 | SG3 | SG4 | SG5 | SG6 | SG7 | SG8 |
K value | 77-75 | 74-73 | 72-71 | 70-69 | 68-66 | 65-63 | 62-60 | 59-55 |
Viscosity, ml/g | 156-144 | 143-136 | 135-127 | 126-119 | 118-107 | 106-96 | 95-87 | 86-73 |
Average polymerization | 1350-1250 | 1250-1150 | 1100-1000 | 950-850 | 950-850 | 750-650 | ||
Number of impurity particle max | 30 | 30 | 30 | 30 | 30 | 30 | 40 | 40 |
Volatiles content % max | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
Appearing density g/ml min | 0.42 | 0.42 | 0.42 | 0.42 | 0.42 | 0.45 | 0.45 | 0.45 |
Residual after sieve 0.25mm mesh max | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
0.063mm min | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 |
Number of grain/400cm2 max | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 |
Plasticizer absorbency value of 100g resin | 25 | 25 | 25 | 22 | 19 | 16 | 14 | 14 |
Whiteness % min | 74 | 74 | 74 | 74 | 74 | 74 | 70 | 70 |
Residual chlorethylenecontent mg/kg max | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
Ethvlidene chloride ma/ka max | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 |