closeup top view on white plastic polypropylene granules heap centered on white backdrop, masterbatch polymer grain pile

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