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Powder-coated aluminium

A baked organic coating over metal. Strong solvents and abrasives attack the coating, and the rule of thumb for what is mild enough is unusually memorable.

In detail

Powder coating covers aluminium with a thermoplastic or thermosetting organic film, baked on, and it is what most modern window frames, garden furniture, radiators and appliance panels are finished with. Because the finish is a polymer rather than an oxide, its failure mode is different from anodising's: strong solvents and abrasive cleaners damage painted surfaces, and excessive abrasive rubbing produces an appearance change even where nothing is visibly scratched. A standards body's escalation for it is deliberately low and worth following in order — flush with water at moderate pressure to dislodge soil; if soil still adheres use a mild detergent with brushing or sponging under uniform pressure; rinse thoroughly; and dry with a chamois, squeegee or lint-free cloth rather than leaving it to air dry in place. Its rule of thumb for what counts as mild is the most quotable line in the document: a soap or detergent judged safe for bare hands should be safe for coated aluminium, and anything stronger must be spot tested carefully. Two standing instructions apply as much here as on anodising: identify the finish before choosing a method, and never clean a hot, sun-heated surface.

Properties

Sensitivity

Acids
Recorded
Alkalis
Recorded
Chlorine bleach
Not known
Heat
Recorded
Abrasion
Recorded
Porous
Not applicable

“Not known” means CleaningHQ has not established this, not that the material is unaffected.

What works

    Soap is safe on, in specific conditions, Powder-coated aluminium

    Safe only in specific conditions

    This is only appropriate within specific limits. Outside those limits, CleaningHQ makes no claim.

    Only within these limits:

    • Mild dish soap, or a fifty-fifty water and vinegar solution
    • No abrasive cleaners and no solvents
    • Blot dry with a dabbing action rather than rubbing

    The one finish in this manufacturer's document where vinegar is affirmatively permitted. Allowing water to evaporate on a metal finish forms deposits, which is why the drying instruction is a technique rather than a step.

    Precautions

    • Test on an inconspicuous area first

    Why we say this

    Supported

    Manufacturer finish-by-finish guidance, and the permission is carried only for the finish it is given for.

    Sources

    1. Care & Cleaning Instructions

      KALLISTA (Kohler Co.) · Manufacturer documentation

      Relied on for: That matte black and other powder coats may be cleaned with mild dish soap or a fifty-fifty water and vinegar solution, that abrasive cleaners and solvents are excluded across finishes, and that allowing water to evaporate on metal forms deposits so the surface should be blotted dry with a dabbing action. (states this directly)

      Verification: a person has read the passage relied on.

      Read on — The sections on nickel silver and chrome; brushed nickel, gunmetal and matte black; PVD finishes; acrylic, cast mineral and cast stone; acrylic baths with airjets; and cast-iron baths. Supports the claim as stated.

    Last reviewed by a person on .

    Why

    Related

    Hacks and claims involving this

    Sources for this page

    Sources

    1. AAMA 609 & 610-02: Cleaning and Maintenance Guide for Architecturally Finished Aluminum

      American Architectural Manufacturers Association (AAMA), 2002 · Standards body

      Relied on for: That the guide covers thermoplastic and thermosetting organic coatings on aluminium, that strong solvents and abrasive cleaners can damage painted surfaces, that excessive abrasive rubbing adversely affects the finish, that the escalation is water then mild detergent then rinse and dry, and that detergents safe for bare hands should be safe for coated aluminium. (states this directly)

      Verification: a person has read the passage relied on.

      Read on — Read in full. Sections 3 General, 4.1 light surface soil, 4.3 organic coatings, and 5 Cleaning Precautions. Supports the claim as stated.

    Last reviewed by a person on .

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