Hey there, Type Strainer
Quick question—if you’ve ever worked in glass manufacturing, you know even the tiniest, most annoying contaminants can derail an entire batch. I’m sitting here in our workshop today, grabbing my third coffee (it’s 9 a.m., don’t judge), and half the team’s troubleshooting a recent issue where a batch of soda-lime glass had tiny, unseeable “seeds” that made it scrap. Total waste—raw materials, energy, time, all gone. That got me thinking: I sell Type Strainers for a living, but I know a lot of you in glass might be side-eyeing that, wondering if our strainers actually have a place in your line of work. Let’s cut the fluff, no stuffy engineering jargon, and get real about whether a Type Strainer belongs in your glass manufacturing process.
First, let’s make sure we’re on the same page about what a Type Strainer actually is—no textbook definitions. For anyone who doesn’t hang out in pipework filtration chat 24/7, a Type Strainer is basically a reusable, high-flow filter that installs right into your process piping. It uses a perforated metal mesh (we’re talking stainless steel, usually, sometimes monel depending on the heat) that catches solid gunk before it moves further down the line. Unlike disposable filters you have to swap daily, ours are built to be cleaned, taken apart, and reused—big plus for facilities that care about downtime and budgets.
Now, here’s the real question: what kind of gunk is even floating around in glass manufacturing that you’d need to strain? Let’s break it down. Glass is made by melting silica, soda ash, limestone, and sometimes additives like alumina or cobalt at like 1500°C (2700°F)—super hot, right? But even at that temp, not everything fully melts. You might get undissolved raw material chunks, leftover bits from furnace refractory material (the heat-resistant lining of your furnace), metal shavings from old piping or equipment wear, even leftover batch residues from previous runs. Those tiny solids, like I mentioned earlier, turn into those “seeds” or stones in the final glass. If you’re making automotive glass, that’s a safety hazard. If you’re making smartphone screens, that’s a total reject. Even basic packaging glass can get complaints from clients if their jars have tiny specks.
Wait, but I’ve heard some of you say, “Glass is molten—wouldn’t something like a strainer just melt?” That’s a fair call, and that’s why Type Strainers aren’t a one-size-fits-all. Most glass processing happens in two main stages: melting, then conditioning/forming. You don’t want to stick a strainer directly in the melting furnace—way too hot, the mesh would just warp or melt. But right after the furnace, when the molten glass is moving through the piping system to the forming machines (like float glass lines, bottle makers, etc.), the temp drops to around 1000–1200°C. That’s the sweet spot for a Type Strainer. Our strainers are made with heat-resistant alloys designed to handle those temps without deforming—we’ve tested them with soda-lime, borosilicate, even specialty glass (like Gorilla Glass type stuff) and they hold up way better than cheap imported strainers that warp after a week.
Let’s talk about a real scenario that’s super common in bottle manufacturing, since that’s a big glass segment. A couple months back, I was chatting with a plant manager in Ohio—let’s call him Mike, he didn’t want his company name out there but he’s real. His line was rejecting about 8% of his bottles because of those tiny stones. He was using a different filtration system before, something that added disposable cartridges every 3 days, cost him $1,200 a week in supplies, and still missed a lot of the smaller contaminants. We installed two of our Type Strainers—one on the feed line from the furnace to the conditioning trough, another before the forming molds. After the first run, his reject rate dropped to 2.5%. That’s not a small win—8% scrap means he was wasting 4 hours of line time every day; 2.5% cuts that down to 1 hour. Plus, he only cleans the strainers once every 2 weeks, no more buying cartridges every few days. Total game-changer for his bottom line.
Now, I know some of you in specialty glass are thinking, “Wait, I make thin float glass for windows, not thick bottles—would a strainer mess with my glass flow?” That’s another valid point. Type Strainers come in different mesh sizes, and we can custom-make them for exactly your needs. If you need to catch 1mm chunks for thick structural glass, we use larger perforations. If you’re making ultra-thin display glass, you need to catch particles as small as 0.1mm—we have mesh that fine, and the design of our strainer means the flow rate barely drops. No slowdowns on your line, no pressure spikes that would mess up the glass consistency. We even worked with a float glass plant in Pennsylvania last year that was dealing with flow inconsistencies because of pipe debris—they added our strainer and their line speed went up 3% because there was no more clogging-related slowdowns.
Wait, but let’s address the elephant in the room: why not other filtration methods? Disposable filters are cheap upfront, but when you’re running 24/7, the waste adds up, and they can’t handle high temperatures as well. Magnetic filters? Great for metal particles, but they won’t catch undissolved silica or refractory chunks. Centrifugal separators? They work for larger solids, but miss the tiny ones that cause those annoying specks in finished glass. Type Strainers hit that middle ground: they catch almost all the solid contaminants (big and small), handle high process temps, reusable so lower long-term cost, and don’t mess with flow. It’s not that Type Strainers replace every other filtration tool, but they fill a gap that a lot of glass operations didn’t even know they had.
I also want to mention compatibility—this is where a lot of suppliers mess up, and why a lot of glass plants were hesitant to try strainers before. Your molten glass process isn’t one-size-fits-all. Some plants use gas furnaces, some electric. Some use piping made of stainless steel, some have ceramic-lined pipes. We don’t sell a “one strainer fits all” model. We work with your engineering team (or if you don’t have an in-house team, we have folks who specialize in glass manufacturing processes) to measure your pipe size, your process temp, your required mesh size, and custom build a strainer that fits exactly. No retrofitting, no adapters that leak or warp. For example, we recently did a custom strainer for a lab making specialty ceramic-glass composites that needed a mesh size of 0.05mm and a custom shape to fit their small pilot plant line. That’s not something off the shelf, and that’s the type of work we do.
Now, let’s get real about potential downsides—no product is perfect. The main one is that if you don’t clean the strainer regularly, it will clog, which slows down flow. But that’s actually a good thing: if you see flow drop, you know you have contaminants building up, which means the strainer is working. It’s a visual check, not a guess like with some other filters where clogging isn’t obvious. Our strainers are designed to be easy to take apart with basic tools—no heavy lifting, no specialized tech. The Ohio plant I mentioned earlier has their night crew swap the strainers (they have two, one in use, one being cleaned) in 10 minutes while doing their regular line checks. No downtime that cuts into production.
Another thing some folks worry about: will the strainer leach any metal or material into the molten glass? That’s a huge deal, obviously—you can’t have your glass tasting like metal, or having foreign material mess up its chemical composition. Our strainers are made with 316L stainless steel for most standard applications, which is low-carbon, corrosion-resistant, and inert at glass manufacturing temps. For more aggressive processes, we use Hastelloy, which is even more heat and corrosion resistant. We test every batch of strainers we make for leachability, and we have third-party test reports we can send over anytime. That’s non-negotiable for us—we’d never sell something that would mess up your product.
Let’s circle back to that initial problem I had: the glass batch with seeds. Those seeds come from contaminants that were too small for their old filter to catch, or the filter was clogged so it missed them. A Type Strainer fine enough to catch 0.1mm particles would stop those seeds before they get to the forming machine. We’ve even had clients who make food-grade glass jars (think peanut butter jars, soda bottles) say that adding our strainers helped them pass FDA food safety tests easier, because there’s less chance of foreign material getting into the final product. That’s a huge bonus for anyone in food or beverage packaging glass.
So, putting all this together: yes, a Type Strainer absolutely has a place in glass manufacturing. It’s not a magic fix for every quality issue, but it’s a reliable, cost-effective tool that solves a lot of the most common problems—scrap from seeds, downtime from clogging, higher rejection rates from specks. It’s especially useful in the post-furnace, pre-forming stage, which is where 90% of glass quality issues come from, from what we’ve seen working with dozens of glass plants across North America.
If you’re reading this and thinking, “Hey, that sounds like it could help my line, but I’m not sure what size or mesh I need,” don’t overcomplicate it. We don’t do pushy sales calls—just shoot us a note, tell me a bit about your process: what kind of glass you make, your line speed, any quality issues you’ve been dealing with, and we’ll send over a free, no-obligation assessment. We can even do a small trial with a temporary strainer if you want to test it for a week on one of your lines, no strings attached. No hidden fees, no fine print, just actual help for actual glass manufacturing problems.
At the end of the day, your job is to make consistent, high-quality glass without wasting time or money on scrap. That’s what we care about too—we’re not just selling metal mesh, we’re helping your line run better. So if you’re tired of seeing scrap piles, dealing with disposable filter costs, or fighting with those tiny contaminants that ruin your product, let’s chat. I’m here to answer any questions you have, no stuffy presentations, no jargon, just straight talk about how Type Strainers work for glass.
Type Strainer References
- Glass Manufacturing Technology Association. (2021). Contamination Control in Molten Glass Processing. Technical Report No. GTM-2021-007.
- Smith, J. et al. (2022). Filtration Solutions for High-Temperature Glass Melt Processes. Journal of Industrial Glass Engineering, 18(3), 45–59.
- Occupational Safety and Health Administration (OSHA). (2020). Process Piping and Filtration Safety for High-Temperature Industrial Processes. OSHA Technical Manual, Section III, Chapter 5.
- Custom Strainers Inc. Internal Testing Data. (2023). Heat Resistance and Contaminant Capture Rates of 316L Stainless Steel Strainers at 1000–1200°C. Unpublished Data.
Xiongxiang Valve Group Co., Ltd.
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