Shamrock Plastics was founded in 1968 for the purpose of manufacturing and supplying custom vacuum formed parts to the local market.  Since that time Shamrock Plastics has expanded and grown to include pressure forming (an economic alternative to injection molding). This has allowed us to service international OEMs in the off-road, building, environmental industries, develop our own line of holiday yard lamp decorations (Lamplighters by Shamrock) and pursue diversification into the food and medical fields.

We have distinguished ourselves as top in the industry by our performance, namely: on time delivery of 98% or above and a quality rating of below 150 PPM.

We ship products all over the world from our central location in Illinois. Shamrock is close to several large Midwestern metro areas including Chicago.  

We possess the flexibility to serve small companies as well as large international corporations.  Regardless of your size or needs, our dedicated, experienced and courteous staff is ready to serve you.  Shamrock Plastics sets itself apart from other molders by offering you personalized service, competitive pricing, prompt delivery and superior quality products.  Our staff combines over 150 years of experience, knowledge and applications expertise to meet the special requirements of each of our customers.