Category Archives: Cast Polyurethane

All about color variances in natural polyurethanes

If you’re considering a natural urethane for your next manufacturing project, here’s what you need to know about possible color variances. The color of natural polyurethane can vary from supplier to supplier, and is impacted by a variety of environmental factors. Typically, they vary between a light tan (almost yellow) to medium-dark amber (almost green). No...
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What you need to know about Standard Urethane Products

Cast Urethane is known for its roughness, durability, and quality. Here’s what you need to know about our standard urethane products.
  1. Cast urethane products improve service life. Our MP Series product line, for example, can improve service life 10-20x when compared to conventional rubber or plastics. Urethanes also outlast hardened steel by 5-1!
  2. Stock shapes...
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Guide to Machining Cast Polyurethane Elastomers (Part 2): Knifing, Milling, Drilling, & Grinding

This month, we continue our guide to machining cast polyurethane elastomers and will be taking a closer look at knifing, milling, drilling, and grinding: Knifing: It’s important that the knife tool be as thin and sharp as possible to get the most precise cuts when close tolerances are present. For metals with hardnesses between 70A and...
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Homerun for Harkness!

  We wanted to share an interesting, successful project we worked on recently with our client, ProBatter Sports. ProBatter Sports has been designing and supplying state-of-the-art pitching systems since 1999. Mike Suba, VP of Engineering came to Harkness with two goals in mind: 1) Improving the performance of the urethane in ProBatter’s current pitching system and 2)...
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The difference between cast urethane and injection molding

    At Harkness Industries, we offer both injection molding and cast urethane. Understanding the difference between these two types of products can make a big difference in your bottom line.         Injection Molding Injection molding starts with the creation of what is called a hard tool. Think of this like a mold, a hard mold. The...
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New Gaskets for Old Equipment

Finding parts for old equipment can be difficult or even impossible depending upon the age. So when a machine is still capable of years of performance yet a gasket goes that can't be found the answer is to get a new one custom made to continues the life of the equipment. At Harkness Industries,...
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Prototype? Cast Urethane is Ideal

Injection molding is great for high volumes, but when it comes to small runs, what you really need is a cast urethane process. That's what makes it ideal for prototypes. Cast urethane processes are fast and cost-effective so whether it's the medical equipment industry or robotics, a durable plastic component can be made quickly at a...
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Altering Cast Polyurethane

  While casting provides the products you need, sometimes secondary machining activities are required in order to get the polyurethane elements into just the right place and in the right working order. Hard urethanes (90 Shore A and up) are fairly easy to machine.   The key is to rely on a plastics expert who understands the machinability...
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Molding – Understanding the Difference Between Injection and Cast

Your project is unique to your needs and determining which process to use comes down to a few key differences in the production processes between urethane cast molding and injection molding. First, let's consider the similarities: Both processes allow for a multitude of colors, soft or rigid durometeres and the ability to "wrap" or cast around...
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Polyurethane = Ultimate Versatility

One of the properties of polyurethane that makes it so incredibly popular and versatile is the range of hardness it exhibits. Whether hard as rock or eraser soft, this material can be formed and molded into nearly limitless shapes while delivering the right amount of hardness for the application. While rubber can be...
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