In the manufacturing of plastic parts using injection moulding process, a myriad of parameters must be established and controlled. The parameters include temperature, time and pressure. While all the parameters are vital to the production of high-quality plastic moulded parts, the pressure is the most different attribute during the injection moulding process. Therefore, it is necessary to understand everything to do with injection moulding pressure. Unfortunately, most small-scale plastic products manufacturers get into the industry knowing only one type of pressure, that is, injection pressure.