Sink marks

From Plastics Wiki, free encyclopedia

Sink mark A shallow depression or dimple on the surface of the plastic article due to shrinkage. Sink marks often are caused by thick wall sections in the part design. Sink marks are also caused by insufficient packing pressure/time and from localized hot spots in the mold.

See also

• Anisotropic shrinkage
• Shrinkage allowance
• Sink mark