Plastic in the Wild – Sink marks

Plastic sink marks are depressions or indentations that can appear on the surface of plastic-molded products due to uneven cooling during the manufacturing process. These marks occur when thicker sections of the plastic part cool and solidify at a slower rate than thinner sections. As a result, the surface can become concave or show signs of shrinkage, affecting the overall aesthetic quality of the product. Effective mold design and proper material selection are crucial in minimizing the occurrence of sink marks and ensuring the final product meets desired visual and functional standards. 

Using Moldflow we can predict and eliminate sink marks during the design phase.