closeup top view of white plastic polypropylene granules, masterbatch polymer grain. hdpe or pvc resin pellets. 3d

polymer masterbatch plastic white raw resin pellets chemistry dye granules extrusion polyethylene grain compound plant petrochemicals industry material thermoplastic factory technology polypropylene polystyrene background science petrochemical injection recycling pattern hdpe production element pigment molding heap grained pet pvc coloring laboratory chemical research lab industrial color granulate closeup top