Performance Standard for Protective Coatings - 90 % of DFT readings ≥ nominal, and no reading < 0.9 × nominal.
Formula
$$ \text{Pass} = (% \text{below NDFT} \leq 10) \land (\min \geq 0.9 \cdot \text{NDFT}) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $NDFT$ | Nominal dry film thickness | µm | coating spec |
| $Readings$ | DFT measurements per ISO 19840 | - | coating inspector |
Sources
- IMO MSC.215(82) - PSPC.
- ISO 19840 - Coating thickness measurement.