This 7.5 inch plaque was developed by the MGS Mfg. Group and is an educational tool used
to support the design, engineering, and manufacture of plastic injection molded parts. Mouse
and click the above plaque or buttons below to read detailed descriptions of each feature.

Sink
An indentation on the surface of the part as a result of significant local change in wall section. Caused by the shrinking action of cooling plastic, sink will occur in thicker areas of part geometry; typically round ribs or bosses. If a part was sectioned, a "void" can be found within the wall.

Sinks can range in depth. Notice the locations of sink on this demonstration plaque.