| Powder-Coated Carbon Steel | Formed or welded steel with a baked powder-coat finish | Approximately 1.0–1.5 mm | 6–12 standard safety padlocks | Suitable for approximately 10–15 workers, depending on lock size | High Strong resistance to impact and forced entry | Medium Contents are not visible without opening | Moderate Requires intact coating and dry storage | Approximately 1.5–3.5 kg | Factories, workshops, utilities, and general indoor maintenance areas | May rust if the coating is scratched or exposed to persistent moisture |
| Stainless Steel | Corrosion-resistant stainless steel sheet, commonly with folded or welded seams | Approximately 0.8–1.5 mm | 6–12 standard safety padlocks | Suitable for approximately 10–15 workers, depending on lock size | Very High Rigid construction with strong tamper resistance | Medium Opaque body protects stored items from view | Very High Suitable for wet, washdown, and many outdoor environments | Approximately 2.0–4.0 kg | Food processing, chemical handling areas, marine locations, and outdoor service points | Higher purchase cost and weight than most polymer alternatives |
| Polycarbonate | Impact-resistant engineering plastic, often supplied with a transparent or translucent cover | Approximately 2.5–4.0 mm wall thickness | 6–12 standard safety padlocks | Suitable for approximately 10–15 workers, depending on lock size | High Good impact resistance with no conductive metal body | High Contents can often be checked without opening | High Does not rust and resists many common chemicals | Approximately 0.7–1.8 kg | Electrical maintenance, wet areas, laboratories, and sites requiring visual status checks | Can be scratched, and prolonged ultraviolet exposure may reduce appearance or service life |
| ABS Plastic | Rigid molded thermoplastic, normally opaque or fitted with a separate clear panel | Approximately 2.0–3.5 mm wall thickness | 4–8 standard safety padlocks | Suitable for approximately 6–10 workers, depending on lock size | Medium Good for routine control but less impact-resistant than steel | Medium Depends on cover design and label placement | High Rust-free with generally good indoor chemical resistance | Approximately 0.4–1.2 kg | Indoor facilities, offices, light industrial areas, and portable maintenance kits | Less suitable for severe impact, high heat, or prolonged outdoor exposure |
| Aluminum | Lightweight formed aluminum with anodized, painted, or powder-coated surfaces | Approximately 1.0–2.0 mm | 6–10 standard safety padlocks | Suitable for approximately 8–12 workers, depending on lock size | High Rigid and difficult to deform under normal use | Medium Usually opaque unless fitted with a viewing panel | High Good resistance to atmospheric corrosion | Approximately 0.8–2.0 kg | Portable maintenance teams, outdoor service work, and locations where low weight matters | Can dent more easily than steel and may be affected by certain alkaline chemicals |