{"id":616,"date":"2026-10-22T02:22:28","date_gmt":"2026-10-21T18:22:28","guid":{"rendered":"http:\/\/www.frphilo.com\/blog\/?p=616"},"modified":"2026-10-22T02:22:28","modified_gmt":"2026-10-21T18:22:28","slug":"what-are-the-particle-sizes-of-different-raw-powders-432e-4c9472","status":"publish","type":"post","link":"http:\/\/www.frphilo.com\/blog\/2026\/10\/22\/what-are-the-particle-sizes-of-different-raw-powders-432e-4c9472\/","title":{"rendered":"What are the particle sizes of different raw powders?"},"content":{"rendered":"

What\u2019s Up With Raw Powder Particle Sizes? A Vendor\u2019s Breakdown You Actually Need Raw Powder<\/a><\/p>\n

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When a customer hits me up asking, \u201cWait, what particle size do you stock for aluminum powder again?\u201d I don\u2019t just rattle off a number\u2014because size makes or breaks whether their job works. I\u2019m not a lab coat-clad textbook guy, just a raw powder supplier who\u2019s seen 100 projects go sideways because someone grabbed the wrong micron rating. Let\u2019s cut the jargon, no \u201cthis is standardized by ISO\u201d garbage that makes your eyes glaze over. I\u2019ll break down the common powders we deal with daily, their actual particle sizes, and why you shouldn\u2019t sleep on this stuff.<\/p>\n

First, let\u2019s get one thing straight: \u201cparticle size\u201d isn\u2019t a random number. It\u2019s measured in microns (1 micron = 0.001 mm, so tiny\u2014you can\u2019t see most of this with your naked eye) and sometimes written as D50, which is the midpoint: half the powder is bigger, half is smaller. For the new folks, that\u2019s your go-to number. For regulars, we\u2019ve got finer and coarser stuff too. I\u2019ve seen guys order 15-micron aluminum thinking it\u2019s \u201csmall\u201d for metal spray, only to clog their nozzle so bad they wasted a whole shift. Don\u2019t be that person.<\/p>\n

Let\u2019s start with the heavy hitters\u2014powders that get used all the time in industrial, hobby, and even consumer stuff. First up: aluminum powder. This is our bread and butter, honestly. We stock three main grades here, because people use it for everything from fireworks to 3D printing to metal coating. The fine stuff (for things like metallic paint or pyrotechnic stars) runs around 1 to 5 microns. Wait, that\u2019s super tiny\u2014like, if you held a grain of sand, 40 of those fit in a single 1-micron particle. That fine aluminum lights up fast, which is why pyrotech guys swear by it. Then mid-grade is 10 to 20 microns\u2014this one\u2019s perfect for thermal spray coatings, the kind that makes bike frames rust-proof. Coarse aluminum? We\u2019ve got 45 to 100 microns, which is for things like concrete additives (it keeps concrete from cracking when it gets cold) or decorative metal bits in resin art. I had a customer last year who used 60-micron aluminum to make glow-in-the-dark countertop resin\u2014said the bigger particles caught light longer than fine ones. Worked like a charm.<\/p>\n

Next, copper powder. Copper\u2019s got different vibes because it\u2019s conductive, so size matters a ton for electrical applications. The fine conductive copper we supply for printed circuit board (PCB) inks or electrodes is 2 to 10 microns\u2014any bigger, and it won\u2019t pack tight enough to carry electricity. We also stock coarser copper for metal injection molding (MIM) parts, which is 20 to 50 microns. Wait, here\u2019s a pro tip: if you\u2019re making copper parts for jewelry casting, go 30 to 75 microns. Why? Finer copper burns too fast in the cast mold, leaves bubbles. Coarser? It doesn\u2019t melt all the way. I\u2019ve had a custom jewelry maker tell me she tried 80-micron copper once, and her castings came out lumpy. Told her to swap to 40-micron, and her rejects dropped by 30%. That\u2019s the stuff you learn from actually talking to customers, not just reading a spec sheet.<\/p>\n

Stainless steel powder is another big one\u2014used for 3D printing, MIM, surgical parts, even kitchen utensils. Most people don\u2019t realize not all stainless powder is the same. We stock 316L (the food-safe, corrosion-resistant kind) in two main sizes: 15 to 45 microns for laser 3D printing, and 45 to 150 microns for cold spray coating. The 15-45 micron stuff is tiny enough to melt evenly in the 3D printer\u2019s laser, so your part doesn\u2019t have weak spots. The coarser 45-150 is for cold spray, where you blast powder onto a surface to build up a layer\u2014finer powder would blow away mid-blast. We also do 304 stainless, which is cheaper for non-food stuff, same size ranges. I once had a 3D printing student come in panicking because his printer kept failing\u2014turned out he ordered 100-micron stainless, which was way too big for his $500 printer. Swapped to 25-micron, and his first print came out perfect. Lesson learned: check your printer\u2019s specs, not just the price tag.<\/p>\n

Titanium powder is a wild card, especially for medical parts. We only supply medical-grade titanium (Ti6Al4V, in case you care) because sketchy titanium can have weird particles that cause issues in implants. The size here? For 3D printing medical devices (like hip replacements or skull plates), we use 15 to 45 microns. That\u2019s the sweet spot\u2014small enough to print intricate holes, big enough that it doesn\u2019t stick to the printer\u2019s chamber walls. We also have coarser titanium, 45 to 100 microns, for things like golf club heads or aircraft parts. Wait, people use titanium for golf? Yeah, because it\u2019s light and strong. A golf brand customer of ours told me their 45-micron titanium powder gives their club faces the right flex\u2014too fine, and the club feels too stiff. Dude knows his stuff, so I listened.<\/p>\n

Now, let\u2019s get to the more niche stuff that still gets asked a lot. Tungsten carbide powder\u2014used for drill bits, cutting tools, stuff that needs to be super hard. This is some of the finest powder we carry, 0.5 to 3 microns. No, that\u2019s not a typo\u2014half a micron. That\u2019s smaller than a red blood cell. You need that fine because when you press and sinter tungsten carbide, smaller particles melt together better, making the tool way less likely to chip. If you tried using 10-micron tungsten carbide for a drill bit, it would wear out in a week. I had a construction guy last year who tried that\u2014called me yelling, said his new drill bits were garbage. Swapped to 2-micron, and he said they lasted 3x longer. That\u2019s the difference size makes.<\/p>\n

Ceramic powder, like alumina or zirconia, is for things like dental crowns, heat-resistant tiles, or electronics. Alumina powder we carry is 1 to 10 microns for dental crowns\u2014you need tiny particles to get a smooth, natural-looking finish. Zirconia, which is stronger, is 5 to 20 microns for the same use. Wait, for high-temperature tiles (like in a furnace), we do coarser alumina, 20 to 50 microns. The bigger particles don\u2019t shrink as much when heated, so the tile stays intact. I worked with a tile manufacturer once who thought finer alumina would make better tiles\u2014they kept cracking after firing. Swapped to 30-micron, and their crack rate went from 25% to 2%. Again, size = outcome.<\/p>\n

Now, let\u2019s talk about the messy stuff that no one tells you: it\u2019s not just the average size. Sometimes you get \u201cfines\u201d (super tiny particles) or \u201ccoarse oversize\u201d that mess everything up. For example, if your aluminum powder has too many fines, it\u2019s prone to catching fire accidentally (ask me how I know\u2014small warehouse fire a few years back because a pile of fine aluminum got too hot from friction). If it has too many oversize particles, it clogs filters, nozzles, whatever you\u2019re using it for. That\u2019s why we test every batch\u2014we sift it multiple times to make sure the particle distribution is tight, not all over the place. I won\u2019t sell you a powder that\u2019s 10% 1-micron and 10% 200-micron\u2014you\u2019ll hate it, and I\u2019ll lose a customer.<\/p>\n

Here\u2019s the thing: most people email us asking for \u201caluminum powder\u201d and don\u2019t specify size, which is like asking for \u201cpaint\u201d and not saying if you want wall paint or spray paint. That\u2019s why we always follow up\u2014we ask what you\u2019re using it for, not just what powder. If you\u2019re a pyrotech, fine aluminum. If you\u2019re coating a metal fence, mid-grade. If you\u2019re making resin art, coarse. We don\u2019t just push a size because it\u2019s expensive\u2014we match it to your project.<\/p>\n

Wait, let\u2019s throw in a real example from last month: a guy reached out saying he needed copper powder for a custom electrode for a 3D printer he built. He said he tried a big online supplier, their 5-micron copper was too fine, burned out his printer. We sent him 15-micron copper, and his printer\u2019s running perfectly now. He left a 5-star review saying he\u2019d tried three other suppliers, and we were the only ones who asked what he was using it for. That\u2019s the difference between a good vendor and a good vendor who actually cares.<\/p>\n

Now, if you\u2019re reading this and going, \u201cOkay, but what size do I need for my project?\u201d here\u2019s a quick cheat sheet:<\/p>\n