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Views: 100 Author: 深圳市博森威电气有限公司 Publish Time: 2026-10-21 Origin: BSUMWELL
In B2B procurement, choosing the wrong material can not only lead to budget overruns but also cause safety incidents due to premature casing failure. As a source manufacturer, we have summarized the following 5 most frequent material selection pitfalls through communication with EPC and procurement personnel worldwide. This article helps you avoid these mistakes:
Over-selection: Specifying stainless steel regardless of the environment
Cognitive bias: The belief that plastic casings are not weather-resistant.
Ignoring coatings: Using aluminum casings directly in chemical or coastal projects
Mismatched parts: The cabinet was selected correctly, but the fasteners were wrong.
Material fraud: Bulk goods are "switched" and lack material certification.
This article was written by the BSUMWELL technical team. We offer three material series: PC/ABS, stainless steel, and aluminum, with protection levels ranging from IP55 to IP68. We support no MOQ minimum order and OEM/ODM customization.
The phenomenon: When reviewing blueprints, many engineers, for the sake of "absolute safety," specify all indoor and outdoor exterior casings, regardless of the corrosiveness of the environment, as 304 or 316 stainless steel. As a result, project BOM costs are extremely high, and delivery times are extended due to metal processing delays.
Tips to avoid pitfalls:
According to internationally accepted ISO 9223:2012 According to atmospheric corrosion classification, if the project is in a C1-C3 environment (such as a dry indoor environment or a typical urban outdoor environment), using UV-resistant PC/ABS plastic can fully meet the protection requirements.
Comparison Dimensions | Stainless steel casing | PC/ABS plastic casing |
weight | Heavy (requires reinforced support) | Lightweight (reduces the load on the wall) |
Grounding | Grounding is required. | Insulation (no grounding required, saving labor time) |
Anti-corrosion | Extremely strong | Zero corrosion (no rust) |
Cost estimate (same size) | Benchmark (High) | Approximately one-third of the base price (estimated based on industry-standard cost models). |
Our solution: We don't blindly push expensive products. Our technical team will recommend the most cost-effective material based on the corrosion level of your project's location. If a typical outdoor environment is sufficient, we will never try to sell you stainless steel. [Read: 《Scenario-based shell material selection: coastal, chemical, solar, electric vehicle charging [Understand the detailed selection logic]
Phenomenon: Some buyers reject quotes for plastic casings outright, saying, "Plastic will break after two years in the sun; we need metal." This reflects a stereotype in the industry of "cheap ABS mixed materials."
Tips to avoid pitfalls:
The performance of industrial-grade plastic casings far surpasses that of ordinary consumer boxes.
Impact resistance: High-quality PC/ABS material, reinforced with structure, ensures the overall shell can achieve [impact resistance]. IK08 or even IK10 Impact resistance rating (protection against vehicle collisions or human damage).
UV resistance: Regular ABS is indeed prone to aging, but if you purchase engineering plastics with added UV stabilizers (through... UL 746C (f1) (UV aging test) It will not turn yellow or crack even after 10 years of outdoor exposure.
Our solution (directly addressing the pain point of "two separate systems"):
We promise that all our PC/ABS housings are made from 100% virgin materials, with absolutely no recycled materials mixed in. We welcome you to send a third party (such as SGS/TUV) to inspect the goods at our factory during mass production. You can retain our samples; if the materials of the mass-produced goods do not match the samples, we will assume full responsibility.
Phenomenon: Customers chose aluminum casings because they needed to dissipate heat or reduce weight, and used them directly in coastal or chemical projects, believing that "aluminum will not rust."
Tips to avoid pitfalls:
Aluminum forms an oxide film under normal conditions, but in high salt spray environments, this oxide film is easily destroyed by chloride ions, leading to severe pitting corrosion. Aluminum casings used outdoors must rely on coating protection.
Industry standard: For aluminum casings used in marine or nearshore environments, the polyester powder coating thickness must meet the following requirements. 80-120μm Furthermore, scratches must be carefully prevented during transportation and installation. Once the coating is damaged, pitting corrosion will spread rapidly.
Our solution:
Our aluminum hulls come standard with a marine-grade polyester powder coating. For C3-C4 level environments, we can provide test reports. If you are working on a C5 (offshore) or CX (offshore platform) project, we would strongly recommend switching to stainless steel to avoid future maintenance issues.
The phenomenon: the purchasing staff carefully selected and purchased a 316 stainless steel casing, but the installation workers casually provided galvanized carbon steel screws and hinges, or directly fixed the stainless steel box to the aluminum bracket.
Tips to avoid pitfalls:
In a salt spray environment (containing electrolytes), contact between metals with different potentials can trigger electrochemical corrosion. More reactive metals (such as galvanized carbon steel and aluminum) can act as sacrificial anodes, accelerating corrosion.
A painful lesson for the industry: The outer casing was intact, but the screws rusted and broke, causing the entire equipment box to fall from a great height.
Our solution (system-wide corrosion protection):
When you buy our stainless steel casings, you get more than just a steel shell. Our stainless steel series comes standard with 316 stainless steel fasteners, hinges, and lugs. During incoming quality control (IQC), we use a spectrometer to randomly inspect the material of the fasteners, ensuring consistency in the material of all metal fittings and preventing "screws breaking first" from ruining your project. [Read: 《Lifecycle cost analysis: 10-year total cost of plastic and metal casings [Let's settle this score]
The phenomenon: When inquiring about prices, customers come to us with extremely cheap quotes for "304 stainless steel" and ask if we can make it. In the steel market, using 201 stainless steel to impersonate 304, or using thin plates to replace thick plates, is a common trick used by unscrupulous suppliers.
Tips to avoid pitfalls:
Stainless steel's corrosion resistance comes from nickel (Ni) and chromium (Cr). Cheap products often have insufficient chromium and nickel content, causing them to rust quickly.
Verification method: Require suppliers to provide... MTC (Mill Test Certificate) Alternatively, you can take a small piece of scrap material, use a spectrometer to analyze it, and the composition will be revealed in a second.
Our solution:
We do not participate in this vicious price war. For every batch of stainless steel and aluminum, we verify the material composition upon arrival and provide an MTC material certificate with each shipment. We only use genuine materials.
A: If it's ordinary ABS without UV protection, it will powder in 1-2 years. But our PC/ABS shell uses a UV-resistant formula, and its design lifespan in direct outdoor sunlight is [not specified]. 10-15 years For extreme desert or coastal exposure, we recommend choosing stainless steel.
A: Its corrosion resistance is indeed inferior. Aluminum requires heavy-duty coatings for protection in coastal areas and is prone to corrosion after scratches. However, it has good heat dissipation and is lightweight. If your equipment generates a lot of heat (such as a photovoltaic inverter) and must use aluminum, we recommend that you apply a protective coating and conduct regular inspections.
A: In environments with strong acids, alkalis, or organic solvents, PC/ABS plastic may experience stress cracking, and even ordinary 304 stainless steel may corrode. We will recommend 316 stainless steel or a special anti-corrosion coating solution based on the chemical media in your environment.
Don't over-select.— For dry indoor and general outdoor use, the UV-resistant plastic shell is sufficient and offers excellent value for money.
The lifespan of plastic depends on the formula.— Look for pure new materials and UV-resistant certification, and it will last for 10 years.
For aluminum casings, the coating must be examined.— Damage is the beginning of corrosion protection failure.
Screws and lugs cannot be ignored.—Using the same material throughout the entire system is the only way to achieve true corrosion resistance.
Material Certificate (MTC) is mandatory.—The most effective weapon to prevent deception and substitution.
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