The innovative online process control GZ US-Plus® enables non-contact process monitoring for curing control on cross-linking plastics such as composites (glass fibre and carbon fibre reinforced plastics), free-flowing granulates, casting resins, BMC/SMC, adhesives (epoxy resins), etc. The mode of operation of the online process control is based on ultrasonic measurements. GZ US-Plus® allows statements to be made about differences in curing properties and flow behaviour compared to reference values or other batches, as well as about deviations in production parameters. By analyzing the measurement data, the optimum process parameters can be determined. In this way, curing times can be minimized, rejects avoided and the quality of the production process documented.