Injection Moulding (IM) is a converting technique for the mass production of a wide variety of products and articles. Sizes can range from only a few millimeters up to several meters.
The molten polymer is injected under pressure into a cooled mold. Depending on the dimensions (size, wall thickness) of the final article different grades are being used. For bigger or thin-walled articles the injection-molded articles, grades with higher Melt Flow Rates (MFR) are needed (MFR is a measure for the viscosity of the molten polymer; the higher the MFR, the lower the viscosity).
Polyethylene (PE), polypropylene (PP), polystyrene (PS), and ABS are widely used resins for Injection Moulding