Liquid Molding Monthly

A Helpful Guide to Processing High Viscosity Resins

There are many specialty materials, such as, Hapco’s Steralloy™, Filter-bond™ and Hapflex™ resins that are formulated for highly-engineered applications, and because of their unique chemistries, they have a thicker viscosity than other products, making them a bit trickier to process. This article offers helpful advice to those who need to process a thicker viscosity resin in order to meet a wider range of requirements for their parts.

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A Helpful Guide to Casting Clear Resins

Achieving optically clear parts using thermoset liquid molding is not impossible. But as anyone with experience will tell you it’s not a slam dunk either, especially if the cast possesses complex detail. So unlike the days of old, today’s materials and methods allow...

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RoHS Compliance

What is RoHS Compliance? The European Union set forth the RoHS (Restriction of Hazardous Substances) Directive to establish environmental guidelines and legislation to reduce the presence of six (6) materials deemed hazardous to the environment. To comply, products...

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Toxics Use Reduction Act

Enacted in 1989 and amended most recently in 2006, The Toxics Use Reduction Act(TURA) requires Massachusetts companies that use large quantities of specific toxic chemicals to evaluate and plan for pollution prevention opportunities, implement them if practical, and...

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Vacuum Vs. Pressure When Resin Casting

Q. What is the difference between vacuum degassing and pressurizing? A. Vacuum de-gassing expands the air trapped during mixing or pouring, causing the bubbles to grow, rise to the surface, and in most cases, release. After a period of time the amount of trapped air...

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Choosing The Best Static Mixer

"There are so many different static mixers, which one is right for my application?", is a common question asked by our customers. The answer, as with many aspects to liquid molding, is complicated and should ultimately involve testing by the user within their...

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Post Curing Thermoset Resins

In the past, we've discussed the importance of temperature control when casting with thermoset resins. In this article, we will focus on the post cure process for molds or parts made with thermoset resins. What is post-curing? Post curing is the process of exposing a...

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3D Printing is Hitting the Mainstream

The world's first 3D printed gun was successfully fired a few weeks ago and besides sparking numerous debates about gun laws and regulation of this technology, it also introduced 3D printing itself to mainstream America. In this article, I will discuss where this...

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Choosing The Best Mold Material

A few months back, we discussed the differences between Liquid Molding and Injection Molding and described when each method is appropriate. As a follow up, we thought it would be important to focus on Liquid Molding and to discuss some of the tooling options as well...

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Surface Coating Method for Molds

Learn an advanced molding technique that can be used for parts or molds. This technique results in a high performance surface coat with a lower cost structural back-up. Products used in this tutorial are the Hapcoat 3721, Haprez 3744/63, Grease-It Wax LT and...

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Surface Casting Method for Molds

This video will teach you how to create a mold with a high performance surface material and a machinable, low cost backup, which in this case is Hapco's Fill-Its/Haprez combo. The reason for creating a mold like this is to cut down on the thickness of the Hapflex 668,...

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Casting a 2-Part Mold in 1 Day

8:00AM - 10:30AM Use some clay to raise the part from the parting board and orient the part to maximize the flow of material and minimize the amount of air that could get trapped. Build up a mound of clay underneath the part, leaving room for the gate and vent. The...

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T-Minus 30 Minutes and Casting

“It ain’t rocket science” as they say, however, the resin-casting/liquid molding process does require “the right stuff” in order to ensure positive results. Whether you’re producing one or two prototypes, or manufacturing a low-volume production run of a few hundred,...

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Liquid Molding Vs. Injection Molding

Outside of its design, precisely how your product or part is molded has the greatest bearing on its cost and capabilities. Great ideas can founder taking the wrong course. So it is prudent to consider your options early in design. How do you know when liquid molding...

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