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Thermoplastics - ABS


Plastic injection molding with ABS plastic

Rebling Plastics has vast experience in plastic injection molding the many different grades of ABS plasic available today including high-impact, glass-filled, transparent and high luster formulations. We have molded ABS plastic components in a wide range of colors for applications that include office machines, electronics and consumer related products. 

Properties of ABS plastic

ABS is an amorphous thermoplastic copolymer blended from Acrylonitrile, Butadiene and Styrene.  Being an amorphous thermoplastic, it is easily plastic injection molded, and it provides uniform shrinkage in both the flow and transverse-to-flow directions, enabling Rebling Plastics to accurately predict mold shrinkage from the outset.  This uniformity in shrinkage can be maintained over a wide processing range so precise dimensional control is easier to achieve when compared to a crystalline thermoplastic.  Uniformity in shrinkage also results in minimal warpage after plastic injection molding. 

Secondary Operations for ABS plastic parts

Rebling Plastics can supply ABS plastic injection molding components that require post molding operations such as: ultrasonic welding to form an assembly; secondary machining operations; installation of metal inserts via ultrasonic insertion; and decorated moldings using hot stamping, pad printing, and laser marking processes.  A unique characteristic of ABS is the ability to chrome plate the material, thus lending itself to applications such as decorative trim, automotive parts, medical devices and toys.

ABS plastic injection molding design

Rebling Plastics design engineers have extensive experience in optimizing ABS plastic part designs for functionality, cosmetics, cost and processing.  Since plastic injection molding of ABS readily shows evidence of sink marks, maintaining uniform wall thickness throughout the part is essential in producing an aesthetically pleasing molding.  Ribs and gussets should be used to core out thick sections.  The rib thickness should not exceed 50% of the intersecting wall thickness.  Bosses incorporated in the design can also result in sink marks if not properly designed.  Sharp corners result in stress concentrations and should be avoided.  To minimize and eliminate these issues, Rebling Plastics engineering staff should be consulted prior to issuing a final design.  This design assistance is provided free of charge.