Liquid Molding Monthly

Filters: A Key Tool in the Fight Against Covid-19

Filters: A Key Tool in the Fight Against Covid-19

Filters are an essential component to entire industries, manufacturing facilities, processes, and in some cases, the end products themselves. Filters are enabling the tools and devices that are essential to defeating this invisible enemy we are now facing: Covid-19.

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River Cribbage Board Using Hapco Resins

River Cribbage Board Using Hapco Resins

Over the past year, the wood and resin craft market has hit its stride. A quick search on Etsy or Youtube yields thousands of results. We've fielded numerous calls from artists, furniture makers, and entrepreneurs trying to find a good epoxy to use for casting river...

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A Helpful Guide to Processing High Viscosity Resins

A Helpful Guide to Processing High Viscosity Resins

There are many specialty 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

A Helpful Guide to Casting Clear Resins

Achieving clear, bubble-free parts using clear epoxy or urethane is not impossible, but as anyone with experience will tell you, it's not without its challenges either. The task can be even more daunting if the part possesses complex detail or undercuts, however with...

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RoHS Compliance

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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Using Polyurethanes in Medical Device Applications

Using Polyurethanes in Medical Device Applications

Medical Device Manufacture encompasses a wide range of health care products that are used to diagnose, monitor, or treat a disease or condition that affects humans. Medical technology extends and improves life. It can help alleviate pain, injury, and handicap. The...

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Toxics Use Reduction Act

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

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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Comparisons of Common Thermoplastics to Hapco Products

Comparisons of Common Thermoplastics to Hapco Products

Polypropylene (Impact, heat and flex) Polypropylene has a tensile strength of 4,500-6,000 psi, an elongation of 1-600% and an izod impact of 2.2-no break at all. For the best simulator of these properties, Hapco would recommend using Hapflex 666 or Hapflex 671. Both...

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Potting and Encapsulation Using Urethanes and Epoxies

Potting and Encapsulation Using Urethanes and Epoxies

Potting consists of immersing the part or assembly in a liquid resin, and then curing it. Although often confused for each other, potting is different from encapsulation in that it retains the shell that is used to contain the thermoset resin while it’s curing....

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Choosing The Best Static Mixer

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

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

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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A Better Understanding of Silicone Rubbers

A Better Understanding of Silicone Rubbers

Silicones are commonly used in the liquid molding process to make molds and parts. Understanding the differences between the different types of silicone can be helpful before deciding what to buy for your application.

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Why Silicone Molds Can Inhibit the Cure of Clear Resins

Why Silicone Molds Can Inhibit the Cure of Clear Resins

If I had to come up with a list of the most common issues our customers call us about, along with air bubbles, a sticky surface on their clear castings would be at the top. My first question to them is always: Are you using silicone? In 95% of tacky surface issues, I...

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Choosing The Best Mold Material

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

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

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

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

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

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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