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Agrack surface treatment guide | Outdoor glass storage rack selection
For indoor glass fabrication, powder coating is a practical finish. For outdoor yards, construction sites, wet stone-storage areas, and ocean export, specify hot-dip galvanizing. The finish decision should follow the exposure, not the color sample.
Choosing between powder coating and hot-dip galvanizing for a glass storage transport rack is not primarily an appearance decision. It is an exposure decision. A rack used inside a dry glass-processing plant has a different corrosion load from one left in a stone yard, moved through a rainy construction site, or shipped through a humid marine environment.
Agrack is a collapsible glass storage transport rack built around a welded Q235 carbon-steel frame. Its value is the complete handling cycle: vertical storage, forklift movement, loaded stacking, and empty-rack return. Because the rack is repeatedly handled and may leave the factory, the surface treatment must match the whole route.
Indoor glass plants: when powder coating is the sensible choice
Choose the blue powder-coated Agrack version when the rack stays mainly inside a dry production hall, warehouse, or protected MRO area. In this environment, powder coating gives the frame a clean, visible finish and can be a cost-conscious option where the main requirements are identification, routine handling, and protection from normal indoor abrasion. It suits indoor glass storage, WIP buffering, and factory transport when water, salt, and persistent condensation are controlled.
Do not extend that decision to an exposed yard simply because the coating looks intact at delivery. Outdoor rain, standing water, damaged edges, trapped moisture, and repeated loading impacts can break the coating barrier. Once moisture reaches exposed carbon steel, corrosion can develop beneath or around the damaged area. For an outdoor rack, powder coating should not be presented as the corrosion-control specification.
Outdoor, construction, and ocean export: specify hot-dip galvanizing
For a stone yard, open construction site, coastal location, or sea-and-land transport route, choose hot-dip galvanizing. The zinc coating provides a more appropriate corrosion-protection basis for a welded steel transport frame exposed to rain, humidity, and handling across multiple locations. This is the correct direction for outdoor glass storage racks and marine logistics—not a claim that every galvanized rack can ignore site drainage, chemical exposure, or maintenance.
Case 15065 provides a clear project reference: an outdoor Agrack configuration with 1600 × 1150 × 1300 mm external dimensions, 2000 kg capacity, and hot-dip galvanized treatment. That project-specific combination shows why finish, load, and dimensions should be confirmed together. It should not be copied as a universal specification. The same platform can be configured for different loads, internal clearances, forklift access, stacking requirements, and return-shipping plans.
The protection of the glass itself remains a separate requirement. Agrack uses 10 mm EPDM protective strips with an internal steel plate, mechanically secured with countersunk self-tapping screws rather than relying on adhesive alone. The surface finish protects the steel frame; the mechanically fixed rubber protects glass edges and coatings during repeated loading.
Why a hot-dip galvanized rack needs vent and drainage holes
A vent and drainage hole is not a cosmetic defect and should not be sealed or removed from a hollow steel section without engineering review. During hot-dip galvanizing, a closed tube or sealed cavity can trap air, moisture, and expanding gases. Properly positioned vent holes allow pressure to equalize, while drainage holes let molten zinc flow through the section and excess zinc drain out. This reduces the risk of a dangerous pressure event and helps the galvanizing bath reach the steel surfaces inside the designed hollow members.
For procurement, the practical instruction is simple: confirm the vent-and-drainage-hole plan before fabrication, especially around capped tube ends and welded assemblies. The hole location must support galvanizing flow without weakening the load path or interfering with folding pins, safety locks, forklift pockets, lashing hooks, or stacking cup feet. A clean, planned opening is part of the galvanizing design; it is not an invitation for site personnel to drill random holes after delivery.
Environment checklist: mark the condition before ordering
- Indoor, dry, controlled plant: select powder coating when the rack is protected from rain, salt, persistent condensation, and aggressive chemicals; confirm color and impact-protection expectations.
- Outdoor yard or construction site: select hot-dip galvanizing; do not treat outdoor powder coating as the corrosion specification. Confirm drainage, stacking, and exposure details.
- Ocean export or coastal route: select hot-dip galvanizing and confirm vent/drainage holes, lashing points, forklift entry, and the intended loaded and folded transport states.
- Glass protection and capacity: separately confirm internal dimensions, glass type, load, stacking height, and EPDM protection. Standard references include 1500 kg dynamic load and 4500 kg static load, while project configurations vary.