PVC molding brings a different set of problems than PP or ABS. Gas, temperature sensitivity and corrosive byproducts all affect how the steel performs over time, especially in fitting molds with deep ribs and multiple sealing areas.
When a customer asks whether stainless steel is necessary, we review the resin formulation, production rhythm and maintenance discipline at the target plant. Some molds only need corrosion-resistant inserts in critical areas, while others justify a broader stainless strategy from the start.
The goal is not to overspecify the tool. The goal is to avoid a cheap first decision that leads to flash, rust or unplanned shutdowns once production scales up.
