How To Passivate Stainless Steel (Citric vs Nitric + Tests)
Passivation is one of those processes that sounds optional—until you see a “stainless” part develop rust-colored spots around a machined edge, a tapped hole, or a weld seam. In most cases, the stainless alloy isn’t the problem. The problem is what happened on the surface during manufacturing: trace free iron, shop dust, smeared metal, or […]
Silver Melting Point: Does Silver Melt Before Gold?
If you’re asking “what melts first, silver or gold,” you might be coming from one of two places: You’re doing something practical—casting, soldering, brazing, heat-treat adjacent work, or reclaiming scrap—and you need a reliable temperature target. You’re comparing materials for a part that might see heat spikes and you’re using melting point as a quick […]
PMMA Vs Acrylic: What’s The Difference (And When It Matters)
If you’re reading quotes that say PMMA, drawings that say ACRYLIC, and a supplier who casually says “Plexiglass”, it can feel like you’re choosing between different plastics. In most purchasing and engineering contexts, you’re not. PMMA = polymethyl methacrylate (the polymer’s chemical name) Acrylic = the common industry name for PMMA So PMMA and acrylic are usually the same material. […]
Best Metal Cutters: 12 Tools Ranked by Speed & Precision
Cutting metal isn’t about finding one “best” tool—it’s about matching metal type, thickness, cut geometry, tolerance, and edge-quality requirements to the right process. Choose wrong and you’ll burn through discs, overheat and warp sheet, harden stainless at the cut line, or spend longer deburring than cutting. I’m Clive at Rapid Manufacturing, and in production we […]
5 Composite Materials You Use More Than You Think
Composite materials are engineered combinations of two or more distinct materials that stay physically different inside the final part—so the structure can achieve property mixes a single material rarely can. In most engineering composites, you’ll see two key roles: Reinforcement (fibers/particles): carries most of the load and delivers stiffness/strength Matrix (polymer/metal/ceramic): binds the reinforcement, transfers load, and […]
The 10 Real Properties of Metals: An Engineer’s Guide
Yo, Clive here, grinding as lead engineer at Rapid Manufacturing (RM) for 16 brutal years. We’ve locked down ISO 9001 for quality, run 80+ CNC beasts, and forged metal parts for aerospace and heavy machinery titans. RM’s a monster – churning 20,000 components weekly, fueled by our in-house lab blasts and client rants that we […]
What Is Zinc？
When the majority of procurement officers or junior engineers listen to the word “Zinc,” they frequently visualize two things: a bottle of cold pills, or a cheap coating on a fence. However, when I walk via a foundry, and I listen to “Zinc,” I visualize the backbone of the modern infrastructure. I think of the […]
Which Is Harder,A 70 Or 90 Durometer?
When the majority of engineers listen to the word “rubber,” they think of a single material. They visualize a rubber band or a car tire. Yet when I listen to “rubber,” I do not think about the material. I think about the Hardness. In the industrial sealing and manufacturing globe, asking for “an O-ring” without […]
How Toxic Is Polyethylene Terephthalate?
When the majority of individuals listen to the name “Polyethylene Terephthalate,” they panic. They visualize a bubbling chemical lab and assume the container is poisoning their water. They are incorrect. As somebody who has actually engineered polymer supply chains for thirty years, I can inform you that PET is arguably the safest plastic on the […]
Is Polymer Plastic? The Truth
If you walk right into a meeting with a product scientist or a process designer and utilize words “polymer” and “plastic” reciprocally, you will see a subtle twitch in their eye. It’s a tell-tale indication that you could not understand the basic physics of the product you will acquire. In the general public creativity, “polymer” […]
