In the PVC plastic coloring industry,  currently more common plastic colorant used is pigment powder, masterbatch and PVC pigment paste. Pigment powder and masterbatch are solid form, PVC pigment paste is liquid paste.  They have their own strengths and weaknesses in PVC plastic coloring.

When pigment powder is used for PVC plastic coloring, it is lower cost, good dispersion and easily operation controlling, it also can reduce the aging of plastic products,  extend the PVC service life. But it is easy to cause the dust pollution during the transporting, storage and plastic processing.  Some of pigment powder that has poor heat resistance and not conducive cutted would be reduce the coloring ability during the PVC coloring process, moreover, some traces will stay on the surface of PVC finished products, can't be remove.

Masterbatch is that takes pigment (or dyestuffs) stay into carrier with the function of resin additives, then makes pigment powder molecules and resin molecules sufficiently combined,  to produce pigment particles having a size similar to resin particles. This process will be through the heating, plasticizing, stirring and cutting.  When masterbatch is used for PVC plastic coloring, it can improve dust pollution problems, more targeted colors, and the compatibility is better than pigment powder.  However, masterbatch needs more processing steps compared to pigment powders, the PVC coloring cost is higher than pigment powder.  When masterbatch carrier has difference with resin colored on performance, plastic products surface appear scatter, stain and pattern. So in the practical application, masterbatch has also been a certain limit due to its compatibility and dispersion.

PVC pigment paste can solve some problems in the using of pigment powder and masterbatch. First, PVC pigment paste is easy to put into the PVC molding and coloring process; second, it has better high temperature resistance, storage convenience, no precipitation; third, PVC pigment paste can reduce the dust pollution,  and make up for the masterbatch lack of compatibility and dispersibility in coloring process; fourth, input of PVC pigment paste is easily controlled during the production, it can reduce color difference, and improve color strength and color brightness; fifth, it meets EU REACH environmental regulatory and requirment. However, for the PVC pigment paste producing, its cost is relative higher than pigment powder and masterbatch, because PVC pigment paste has a higher requirement on process and material quality.

When we choose and use PVC plastic colorant, we would consider the application requirements and process conditions, the preferred choice for using. And in practical applications,  PVC pigment paste will be more in line with double requirements of modern industrial manufacturing and product quality.