Quality control in compression molding is critical to ensure consistent product performance, dimensional accuracy, and structural integrity. The process begins with the inspection of raw materials, such as thermosetting resins or rubber compounds, to verify their conformity with required specifications, including viscosity, moisture content, and curing properties.

During molding, process parameters such as temperature, pressure, and curing time must be precisely controlled. Variations in these parameters can lead to defects like flash, voids, warping, or incomplete filling. To maintain uniformity, machines are calibrated regularly, and molds are inspected for wear or damage.

In-process inspections are conducted using visual checks, dimensional measurements, and non-destructive testing methods such as ultrasonic or X-ray analysis to detect internal flaws. Post-molding quality checks include mechanical testing (e.g., tensile, flexural, and impact tests), surface finish inspection, and dimensional verification using tools like calipers or coordinate measuring machines (CMM).

Statistical Process Control (SPC) is often implemented to monitor trends and detect deviations early. Documentation and traceability are maintained throughout production to ensure compliance with industry standards and customer requirements.

Effective quality control in compression molding minimizes waste, reduces rework, and enhances product reliability, making it essential for applications in automotive, aerospace, electrical, and consumer goods industries.