How does investment casting pricing work at Pennsylvania Precision Cast Parts? To provide as much clarity and predictability as possible, PPCP first establishes a cost for producing the desired castings. This cost would only change within the provisions of the quote and agreement. We then apply a material surcharge, which can widely differ depending on the selected alloy(s). The new material surcharge table is published on the PPCP website each month and can be viewed here. This enables customers to always know the costs they are incurring.