Blog

The Pros and Cons of Cold vs. Hot Runner Molds

Every plastic part starts in a mold.   Molds are classified into two main types, cold runner and hot runner.  Each has its advantages and disadvantages.   Your plastic injection molder will be able to give you the costs and benefits of using these different systems.  However, by understanding the key differences of these technologies, you...
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The Harkness Standard For Urethane Shapes

Harkness Industries’ cast urethane shapes (sheet, tube, rod and bar) are well known for their extraordinary toughness, durability, and consistent quality. Our MP Series product line will improve service life by 10 to 20 times versus that of conventional rubbers and plastics. In the toughest abrasion environments, urethanes will outlast hardened steel by...
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A Guide To Machining Polyeurethane

Cast polyurethane can be readily turned, sawed, drilled, ground or milled. These and other secondary operations present many similarities to the machining of metal, but there are also some important differences. This following information is intended to provide some general guidelines for machining urethanes. See Also: The advantages of injection molding It is important to note that the material...
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The Advantages of Custom Injection Molding

The injection molding process has several advantages over other molding processes. It allows for the fast production of plastic parts with reduced waste and at low cost. The following is a short list of what you can expect from utilizing Injection Molding as your form of production.
  • Injection molding allows for high production output...
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Rethinking Mass Production: How 3D Printing Is Changing Manufacturing

How can 3D printing help change the way we think about mass production and injection molding? How is helping change the way we think about prototyping and creating new ideas? Here we look at the basic tenets of mass production and how technology is changing the marketplace. It’s a basic tenet of mass production: Making things...
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Why Does Colour Vary in Natural Polyurethanes?

Natural polyurethanes vary from a light tan (almost yellow) to a medium-dark amber (almost greenish). This variation is noticed from supplier to supplier, and even within a given supplier’s production. Black or other colored (pigmented) polyurethanes do not typically exhibit this variability in color. It is important to note that these color variations...

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Guide To Machining Cast Polyurethane

Cast polyurethane can be readily turned, sawed, drilled, ground or milled. These and other secondary operations present many similarities to the machining of metal, but there are also some important differences. This following information is intended to provide some general guidelines for machining urethanes. See our complete guide to machining cast polyurethane here. It is important to note that...
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Harkness Industries Custom Urethane Capabilities

Castable urethane has many unique properties, allowing it to be molded into thousands of custom parts. Some of it's properties include:
  • Outstanding Abrasion Resistance
  • Excellent Cut & Tear Strength
  • High Load Bearing Capability
  • Resistance to Oils & Solvents
  • Long Flex Life
  • Wide Range of Hardness (10A – 80D)
  • Superior Dynamic Properties
  • High or Low Resilience
  • Good Hydrolytic Stability
  • High Impact Strength
Harkness Industries’ unparalleled knowledge of...
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Low Hardness Urethanes — Harkness Industries’ Softer Side

When looking for ultra-low hardness in urethanes, it’s tough to find materials that perform without “sweating.” Since 2003, Harkness Industries has used a unique process to produce more than 55,000 urethane sheets, tubes and rods at hardnesses from 10A to 50A. What’s does 10A to 50A indicate? And what is wrong with “sweating?” Urethane hardness...
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Urethane Mixing Machine Adds Flexibility to Harkness’ Production

One of the many ways Harkness Industries has become one of the plastic industry’s most customer-responsive suppliers is through versatility in production including prototyping, tool design, plastic and urethane molding. Production has moved to the forefront of technology with urethane mixing machine capability that can produce six different components simultaneously. An onboard computer...
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