Probe examples, not acceptance limits
Elcometer’s matrix gives ferrous-probe directions for paint on steel and zinc on steel, and non-ferrous-probe directions for paint or anodizing on aluminum. Confirm the exact probe range and suitability on the instrument data and a representative sample.
Wet film and dry film
For an unthinned coating with 60% solids by volume, a specified dry-film target of 100 µm corresponds to an estimated wet film of 100 / 0.60 = 166.7 µm. This is an assumed arithmetic example, not a thickness recommendation. Measure the cured film under the required procedure.
Dimensional growth has geometric assumptions
If a purely deposited layer adds 10 µm outward on every side of an ideal cylinder, its diameter grows by 20 µm; a uniformly coated bore loses 20 µm. Total coating thickness need not equal outward growth for conversion coatings or anodizing.
Record enough to interpret the result
Record coating and substrate, wet/dry state, probe and adjustment/reference method, locations/readings and the contract limits. Roughness, curvature, masking and subsequent finishing may affect the result.
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Sources and review scope
Reviewed 23 October 2026. Arithmetic examples are labelled separately from source-table facts and standard scope.
ISO 2808:2019
Public scope distinguishes wet, dry and uncured powder-film thickness methods; no universal thickness limits inferred.
Open the original source ↗Elcometer coating/substrate probe matrix
Manufacturer probe-selection examples; verify suitability and adjustment for the actual instrument and sample.
Open the original source ↗DeFelsko wet-film thickness guide
Solids by volume, wet/dry film relation and limits of the process estimate.
Open the original source ↗