Injection Molding Blog

One of our tray molds was cut in 1996. It has been rebuilt once. It is still running today, and it has never left the building. A tray costs a few cents. The tool that makes it outlives the people who ordered it.
A dental impression tray is a

“Custom tray” means two completely different things depending on who says it. One of them takes an afternoon. The other takes about six weeks. Buyers ask us how much volume it takes before a dedicated mould makes sense.

Tray catalogues are confusing because they mix three different classifications at once. Arch coverage. Perforation. Brand names for proprietary rim designs. A buyer ends up comparing a “medium upper” against a “quadrant” against a trademarked product line, as if those were the same kind of choice.
They are not.

We run the same tray mold twice a month. Once it comes out green. Once it comes out clear. Same steel, same cavities, same 17-second cycle — and two parts that behave differently the moment they leave the press.
Most buyers pick a dental impression tray by shape and

You’ve perfected your design. Every dimension is right, the geometry flows, and your CAD model looks beautiful. Then you choose the wrong plastic, and suddenly you’re staring at warped parts, stress cracks, or a material that costs 10× more than necessary. Great design with the wrong material is a failed

A CAD model can look finished and still be difficult to mold. Uneven walls cool at different rates. Vertical faces without draft drag during ejection. A poorly placed gate can leave a weld line exactly where the part carries load. These problems are easier to correct in the model than

A brand recently came to us with an unusual brief: make a tongue scraper from recycled PP, ship it in a recyclable bag — no mixed-material laminate — and leave room to print “made with recycled plastic” on the pack.

It’s a good brief, and a telling one. More brands

For 17 years we have molded acetal valve components for a European medical-gas brand — plugs, stem guides, and check-valve seats, some so small they weigh just five milligrams — and POM is the one resin that holds the seal every time.

This is what nearly two decades of molding

Half the nylon enquiries that land in our inbox just say “nylon.” But PA6 and PA66 aren’t interchangeable — pick the wrong one and you get a part that warps, drifts in humidity, or fails at temperature.
This guide is how we choose between them in our factory: the

When a customer asks me ‘how many cavities should this tool have,’ my answer always starts with the same question back: ‘how many shots will you run a year?’

For small-volume programs, lean toward family molds to keep tooling cost down — group parts that share the same resin, the

ABS is the single most-used injection molding material on our shop floor. Most of our parts run on it, and we mold tens of millions of ABS pieces every year — so the advantages, the failure modes, and what to design around are things we know from running the machines,

If you’re sourcing an injection-molded part right now, the runner system question probably came up in your last RFQ — and there’s a decent chance it was answered wrong. Most OEM buyers either over-spec hot runner on a program that won’t pay it back, or take cold runner on faith