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Guides in this topic
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Coating Trial Photographs: Keep Image Processing Consistent
Editing settings can change the apparent contrast, colour and clarity of a coating comparison. Preserve the original photographs and apply a consistent, disclosed processing approach when images are used as evidence.
Wash-Water Reuse Claims: Distinguish Collection from Actual Reuse
Collecting wash water and reusing it are different outcomes. A workshop should measure the quantity actually returned to an approved process before describing a reuse rate or estimating reduced fresh-water demand.
Working Solution or Concentrate: Label the Sample Sent for Cleaner Testing
A cleaner test report must identify whether the sample was tested as supplied or at a working dilution. Without that information, the result may be applied to a condition the laboratory never evaluated.
Cleaner Consumption per Accepted Result: Include Failed Attempts in the Trial Record
A consumption comparison should include material used in unsuccessful or repeated attempts, not only the final successful pass. Define the accepted cleaning result before calculating how efficiently a product or process achieved it.
Solvent-Rub Resistance Is Not a Universal Full-Cure Test
A solvent-rub result describes resistance under a specified test. It does not automatically prove that a coating has reached every property required for service or that the same result applies to another solvent.
Linear and Rotary Abrasion Tests: There Is No Universal Cycle Conversion
A cycle in a linear abrasion test is not automatically equivalent to a cycle in a rotary test. Report the actual apparatus and procedure rather than converting cycle counts through an assumed universal factor.
Abrasion Mass Loss and Volume Loss: Density Changes the Comparison
Equal mass loss does not necessarily mean equal volume loss when materials have different densities. A coating abrasion report should explain the chosen outcome and retain the information needed for a fair comparison.
Coating Test Method Revisions: Check What Changed Before Combining Historical Results
A revised test method may change details that matter to comparison. Keep the edition or revision in the record and review relevant changes before combining older and newer coating results into one trend.
Coating Test Deviations: Report What Actually Happened
A report should distinguish the planned method from the procedure actually performed. When a deviation occurs, document it and its potential effect before using the result to support a coating claim.
Below Detection Limit Does Not Mean a Coating Contains None
An analytical result reported below a detection limit does not establish absolute absence. Preserve the method limit and reporting language when summarizing a coating or ingredient analysis.
Quantification Limit in a Coating Report: Detection and Reliable Measurement Differ
A laboratory may detect a signal without being able to quantify it reliably at the level required for a decision. Keep detection and quantification terminology separate when reading a coating-analysis report.
Coating Laboratory Results in Different Units: Convert Before Comparing Limits
A result and an acceptance limit must use compatible units and the same quantity basis before comparison. A correct-looking number can produce the wrong decision when a unit prefix or concentration basis is overlooked.