PVC melt stability relationship to impurity chemistry of carbon black

Principles of Thermal Degradation

“…387 Also, some grades of carbon black used in production of video disks caused melt instability. The only direct influence on thermal degradation is related to the effect of iron oxides which are known to increase PVC degradation rate.…”

Principles of Stabilization

“…Carbon black gives good protection to many polymeric materials including PVC. 371 Some products are routinely protected against effect of UV by carbon black and these include pipe 190 and wire and cable. It was mentioned in one application that carbon black was not used because it was incompatible.…”

PVC Additives

“…Figure 3.24 shows results of such an attempt in which magnesium oxide was used as a replacement pigment. 28 The greatest effect was caused by surface oxygen, which can make PVC containing carbon black unprocessable. 26 Information on pigments other than titanium dioxide is scarce.…”

“…It is clear that the attempt was not successful because material elongation was drastically decreased even by small additions of magnesium oxide. 28 However, it is quite well established that some iron pigments affect color stability of PVC.…”