How is PTFE Coating Done? The Complete Process
If you are sourcing components that require extreme non-stick properties, chemical inertness, or a near-zero coefficient of friction, you will eventually find Polytetrafluoroethylene (PTFE) on your Bill of Materials. However, specifying a “PTFE coating” on a purchase order without understanding how it is applied—or its critical thermal and chemical limitations—is a massive procurement risk. Many […]
Stop Sending Napkin Sketches: The Buyer’s Guide to Manufacturing Quotes
Let’s get something straight right out of the gate. In my 12 years managing supply chains, rapid tooling, and high-volume production at RAPMAF, I’ve seen thousands of RFQs (Requests for Quote) cross my desk. Some are from seasoned Procurement Managers at Fortune 500 companies who hand over a perfectly packaged ZIP file with 3D STEP […]
How Plastic Is Made: From Crude Oil to Polymer
Hello, I’m Clive Chen, an engineer with Rapmaf. Every day in our facility, we handle thousands of pounds of plastic materials. They arrive as small, uniform pellets, each grade precisely formulated for a specific application—some are crystal clear and destined for medical devices, others are jet black and reinforced with glass fibers for automotive components. […]
An Engineer’s Guide to Plastic Manufacturing Processes
Hello, I’m Clive Chen, an engineer here at Rapmaf. My team and I spend our days working with clients from the US, Europe, and all over the world, helping turn their designs into real, functional parts. A huge part of that work involves plastics. I often find that while a designer or procurement manager knows […]
Transparent vs Translucent: A Material Selection
Hello, I’m Clive Chen, an engineer with Rapmaf. One of the most common—and most critical—notes I see on engineering drawings is a simple one: “Material: Clear Plastic.” While I understand the intent, in the world of manufacturing, “clear” is a dangerously ambiguous term that can lead to costly mistakes, project delays, and parts that simply […]
How Much Does an Aluminum Sheet Cost? 4×8 Price Guide
If you’re buying aluminum sheet for fabrication or CNC machined parts, you’ve probably asked some version of this: “How much does a 4×8 sheet cost?” “Why did the price jump since last quarter?” “Is 6061 more expensive than 5052?” “Why does the same thickness cost more from one supplier?” Here’s the honest answer: there isn’t […]
How to Cut Acrylic Sheet (Without Cracking): Tools & Tips
If you’ve ever tried to cut acrylic sheet (PMMA) and ended up with a chipped edge, a white “stress” line, or a crack that runs past your cut… you’re not alone. Acrylic looks easy because it’s “just plastic,” but it behaves differently than wood, aluminum, or polycarbonate. I’m writing this as an engineer at a […]
Sheet Metal Fabrication Cost: Cut Our Client’s By 53%
You’ve got a design for a bracket, an enclosure, a chassis. It looks perfect in your CAD software. Now comes the hard part: getting it made without blowing your budget. You send out a request for quote (RFQ) to three different sheet metal fabrication shops and get back three wildly different numbers. One is bafflingly […]
SMAW Welder Pay in the US: What You’ll Really Earn
SMAW (Shielded Metal Arc Welding)—also called stick welding—is still one of the most valuable field welding skills in the US because it works when conditions aren’t ideal: outdoors, wind, dirty steel, remote sites, and awkward positions. That practicality shows up in pay, especially once you add overtime, per diem, and union scale. I’m Clive at […]
Who Makes Jet Aircraft Engines? A Buyer’s Field Guide
I’m Clive, an engineer at Rapid Manufacturing. When buyers search “jet aircraft engines” or “who makes jet engines for airplanes”, they usually aren’t looking for trivia. They’re trying to make a sourcing decision: Who are the real engine OEMs behind the aircraft programs? If I need parts, prototypes, repair spares, or short-run production, what kind of […]
