As someone who’s spent over a decade supplying aluminium alloy platforms to construction, logistics, and industrial operations across North America, I get asked the same question at least twice a week: “Why does every platform manufacturer swear by a specific aluminium alloy, and what makes it better than the others?” For too long, the general public (and even some in the trade) write aluminium off as a single, generic metal—light, maybe a little soft, not as strong as steel for heavy lifting. But if you’ve ever worked on a scissor lift, walked across a warehouse loading dock platform, or climbed a mobile access platform at a manufacturing plant, you’ve felt the difference the right alloy makes. This post isn’t going to bore you with aerospace-grade metallurgy jargon, but it will break down the four most common aluminium alloys we specify for platforms, what makes each ideal for their intended use, and why choosing the wrong one can lead to costly downtime, safety risks, or unexpected replacements. Aluminium Alloy Platform
First, let’s ground this in why aluminium is even the go-to for platform applications in the first place. Unlike steel, which is heavy and prone to corrosion if not painted or galvanized, aluminium has an inherent oxide layer that forms almost instantly when exposed to air—think of that dull silver sheen that never really scratches bare metal the way steel does. That layer makes it way more corrosion-resistant, which is non-negotiable for platforms that sit outside in rain, snow, or constant warehouse humidity. It’s also 1/3 the weight of steel, so a platform built with aluminium is easier to move, install, and modify without needing a 2-ton forklift just to reposition it. But not all aluminium alloys are created equal; the 6000 and 5000 series make up over 90% of the aluminium we use for platform work, with a few specialty 7000-series alloys reserved for ultra-heavy-duty applications. Let’s start with the workhorse that’s in 70% of the platforms we ship: 6061 aluminium alloy.
I love 6061, and that’s not just because it’s the most widely requested alloy in our order books. For context, it’s a heat-treatable alloy made up of primarily magnesium and silicon—those two elements are what give it a balance of strength, formability, and corrosion resistance that’s hard to beat for general-purpose platforms. Let’s break down its sweet spots. First, it has a tensile strength of around 45,000 psi, which is strong enough to support heavy foot traffic, standard warehouse equipment, and small to medium mobile access platforms. But here’s the kicker: it’s incredibly easy to machine and weld. When we get an order for a custom platform for a small manufacturing line that needs to fit around existing machinery, 6061 is our first pick because our fabricators can cut, bend, and weld it on-site without needing specialized, expensive equipment. That saves our clients time and money on installation. Corrosion-wise, it’s perfect for indoor use, and if we add a powder coat (a common optional finish for 6061), it even holds up to light outdoor use—think backyard work platforms, small loading docks for light delivery vans, or temporary access platforms for construction sites that only need to last a season. The only downside? It’s not ideal for constant heavy loads over 2,000 lbs per square foot, and it can warp if exposed to extreme heat (like near industrial furnaces or welding stations). We always note that in our product specs, so clients don’t try to push it beyond its limits.
Next up is the workhorse’s tougher cousin: 6063 aluminium alloy. A lot of people mix up 6061 and 6063, but they’re two very different beasts, and each has its own role. 6063 is also a heat-treatable magnesium-silicon alloy, but it has a lower magnesium content and a higher silicon content, which gives it a smoother finish and slightly lower tensile strength—around 35,000 psi—wait, that makes it sound weaker, right? No, wait, that lower tensile strength is actually a feature for a specific type of platform: stationary walkway platforms and step platforms that are meant to be aesthetic, not just functional. 6063 extrudes way more smoothly than 6061, which means we can make the rails, edges, and even the decking without rough spots or seams. That’s why it’s the go-to for retail warehouse platforms, office mezzanine platforms, and access platforms for walkways in shopping centers—places where you don’t just need a platform that holds weight; you need one that looks clean and polished, since it’s part of the interior of a building. It’s also more ductile, so it won’t crack if a forklift lightly bumps into it (something that matters a lot in high-traffic office warehouses). We don’t use 6063 for heavy-duty loading docks, though—its lower tensile strength means it can’t handle constant heavy rolling loads from pallet jacks or forklifts without wearing down. For that, we turn to the 5000 series.
If you need a platform that can stand up to years of constant abuse—heavy rolling loads, exposure to salt, extreme temperatures, and harsh chemicals—5083 aluminium alloy is the answer. This is the heavyweight of the aluminium platform world, and it’s what we use for industrial loading docks, permanent outdoor access platforms for ports, and platforms for chemical processing plants. Unlike the 6000 series, 5083 is a non-heat-treatable alloy, made with magnesium as its primary alloying element, with small amounts of manganese and chromium added for extra strength and corrosion resistance. Its tensile strength is around 45,000 psi, same as 6061, but where it blows 6061 out of the water is its durability in harsh conditions. For example, if you’re a port in Florida where the air is thick with salt spray, or a chemical plant that needs platforms to resist spills of acids or bases, 5083 won’t corrode the way 6061 will—its oxide layer is much more resistant to chemical degradation, so it can last 20+ years with minimal maintenance, compared to 10-15 years for a 6061 platform in the same conditions. It’s also incredibly tough: it can handle heavy rolling loads of up to 5,000 lbs per square foot, which is why it’s used for truck loading docks where forklifts are moving pallets 12 hours a day. The only tradeoff? It’s harder to machine and weld than the 6000 series, so custom parts for 5083 platforms take a little longer to fabricate, but for clients who need long-term reliability, that extra time is worth it.
Now, the special guest: 7075 aluminium alloy. You might recognize 7075 from aerospace parts and race car frames, where strength-to-weight ratio is king. We only recommend 7075 for ultra-heavy-duty, low-weight applications where every pound counts. For example, mobile access platforms for construction cranes, or platforms used in aerospace manufacturing plants where the platform needs to support 10,000 lbs or more but still be light enough to move with a small crane. 7075 is made with zinc as its primary alloying element, and it has a tensile strength of up to 83,000 psi—almost twice as strong as 6061. That’s impressive, but it also has downsides: it’s way more expensive than the other alloys, it’s more prone to corrosion unless it’s coated with a special anodized finish, and it’s much more brittle, so it can crack if dropped or hit with a heavy object. We almost never use 7075 for standard or even heavy-duty loading docks; it’s for niche applications where maximum strength and minimum weight are non-negotiable, and the client is willing to pay a premium for that. I remember a project a few years back for a company that builds crane platforms for offshore oil rigs—they needed a platform that could support 15,000 lbs, but also be light enough to hoist up to the crane’s platform without requiring a huge lifting crew, so we went with 7075, and it’s still in use 8 years later.
Now, I get it—most clients don’t want to overpay for a stronger alloy than they need. That’s why our team’s first step when you reach out is to assess your specific use case, not just push the most expensive alloy we have. For example, if you need a temporary access platform for a construction site that will only be used for 6 months, 6061 is more than enough, and it’s cheaper than 5083. If you need a stationary walkway platform inside a clean manufacturing facility, 6063’s smooth finish will fit your needs perfectly. If you need a loading dock that will be exposed to salt and heavy forklift traffic for the next two decades, 5083 is the only way to go.
I’ve seen firsthand what happens when people pick the wrong alloy for their platform. A few years back, we had a client who ordered a 6061 loading dock for their port, thinking “all aluminium is the same.” Within a year, the decking started corroding from the salt spray, and the welds on the railings cracked from the constant bumping of forklifts. They ended up having to replace the entire platform 3 years early, costing them twice as much as if they’d ordered 5083 in the first place. That’s why transparency is non-negotiable for us—we don’t sell you an alloy that’s overkill, and we won’t sell you one that’s going to fail in 12 months.
At the end of the day, aluminium platforms are all about matching the alloy to the job. The 6000 series is the workhorse for general use, the 5000 series is the heavy-duty workhorse for harsh environments, and the 7000 series is the niche workhorse for when you need maximum strength in a lightweight package. If you’re not sure which alloy is right for your next platform, or if you have questions about custom fabrication, finishes, or load requirements, our team is here to help. We’ve worked with everyone from small warehouse owners to large industrial construction firms, and we can help you find the perfect solution for your needs. Don’t waste time and money on a platform that’s not built for your use—reach out to our team today to discuss your project.
Electric Articulated Boom Lift References
- ASM International. (2019). Aluminium Alloys for Structural Applications. ASM Handbook, Volume 19: Fatigue and Fracture.
- Metals Service Center Institute. (2021). Aluminium Alloy Specifications for Industrial Platforms and Structures. MSCI Technical Report.
- Davis, J. R. (Ed.). (2001). Aluminium and Aluminium Alloys. ASM International.
- International Organization for Standardization. (2018). ISO 6361: Wrought aluminium and aluminium alloys for general engineering purposes — Extruded bars, rods, profiles and tubes.
Mantall Heavy Industry Co., Ltd.
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