(231) 267-5221 5780 Moore Road Williamsburg, MI 49690
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Injection Molding

Scientific Molding

GTP employs scientific injection molding which is a disciplined approach to determine and control the optimum injection molding parameters, to produce consistent quality molded parts at a lower overall cost. Using scientific molding techniques, GTP establishes consistent, repeatable plastic injection molding process parameters based on predictable facts and data.  Focusing on part design, mold design, material selection, and measurement of plastic injection molding parameters, GTP systematically eliminates variables that would result in defective or out-of-spec parts.

GTP applies the latest in scientific injection molding technology, coupled with the experience of our highly trained team and innovative engineering, to ensure the optimal plastic injection molding process controls, repeatability and part quality.  

Some benefits of scientific injection molding include:
  • Higher Yield and lower material consumption
  • Optimized process and cycle times
  • Consistent repeatability and part quality-every set-up and part run
  • Improved flow control with no weld lines or surface flaws
  • Reliable process documentation

Engineered Resins

Since its inception in 1981, GTP has utilized literally hundreds of different materials to effectively meet our customers price and performance specification. This includes high performance polymers which are critical for our metal-to-plastic part conversions, engineered polymers filled and un-filled commodity and custom formulations known for their UL flame retardancy/heat resistance and enhanced/commodity resins filled, high impact, anti-static, scratch resistant PP and TPO’s along with injection mold grade HDPE, LDPE, PVS & PPS.
GTP has a deep-rooted material supply base and has been working with a core set of specialty suppliers for over 20 years. This has allowed GTP to develop trusting relationships with these suppliers. As a result, GTP collaboratively works with these suppliers and customers in developing, testing and analyzing material formulations that meet or exceed customer requirements for new and metal-to-plastic applications.

With this broad resin exposure and experience, GTP has been able to hone its manufacturing capabilities to produce plastic injection molded components and assemblies across a full range of materials from high performance polymers to commodity resins.

RJG Technology (eDART System™)

RJG Technology (eDART System™) is a comprehensive process monitoring system resulting in improvement of molding quality, productivity, and profitability.


Maintaining dimensional tolerances of +/- 0.025mm

GTP’s lights out, high precision, tight-tolerance injection molding capabilities allows us to meet tolerances of up to +/- 0.025mm. Manufacturing tight tolerance parts does not “just happen”.  It takes collaborative efforts with our customers during the design phase along with a number of factors that influence tolerances.  GTP is able to achieve tight tolerances by attention to numerous factors including:

  • Machinery: machinery used in tight tolerance injection molding must be in optimal working order, carefully calibrated and properly maintained.
  • Processes: GTP utilizes Scientific injection molding and also maintains a well-controlled injection molding process which includes using RJG Technology and matching pressure curves to help yield the best results for tight tolerances.
  • Mold Design: Injection molds used for tight tolerance molding need to be designed to yield the best consistency of part dimensions.  GTP takes many factors into consideration during the mold design phase including; cooling rates, number of cavities, mold balancing, etc.
  • Part Design: Overall part size, part geometry and wall thicknesses all have an impact on tolerances. GTP works up front with our customer’s engineers on part design features which influence meeting tight tolerances.
  • Material Selection: Injection molding resins all have different shrink, warp, flow rates and shrinkage factors which all influence tolerances. GTP’s extensive resin experience helps in choosing the right material for tight tolerance applications.

GTP is capable of meeting tight tolerances on injection molded components and assemblies because we understand all of the elements needed to produce a good part capable of meeting tight tolerances.  Along with our expertise and experience, we invest in new, world-class technology and have machinery and equipment that is well maintained and calibrated. We also work with tool suppliers capable of building high-quality molds and we add secondary automated operations (for post-mold assembly)  if needed.