Standards and Testing
What each test measures, how to read the result and where it falls short.
- ASTM B117 Neutral Salt Spray: What the Hours MeanWhat an ASTM B117 salt spray result measures, how the test is run, and why the hours do not convert into years of service or compare across standards.
- ASTM G85 Acidified and SWAAT TestingWhat the ASTM G85 annexes test — acetic acid salt spray, cyclic acidified fog, SWAAT, SO₂ and dilute electrolyte — and why HVAC specifications use SWAAT.
- Salt Spray vs Cyclic Corrosion TestingWhy cyclic corrosion tests, which alternate salt, drying and humidity, rank coatings closer to field results than continuous salt spray — and what they cost.
- ISO 12944 and What It Means for HVAC CoilsISO 12944 specifies paint systems for steel structures. What carries over to HVAC coils — the corrosivity categories — and what does not.
- Measuring Dry Film Thickness on FinsHow dry film thickness is measured on thin coil fins — eddy-current gauges, witness panels, microscopy and film weight — and where to measure.
- How Coating Impact on Heat Transfer Is TestedHow the heat-transfer and pressure-drop effect of a coil coating is measured — before-and-after coil tests, what to ask for, and what a reasonable result is.
- ISO 9227 Salt Spray TestsThe three ISO 9227 salt spray tests — neutral, acetic acid and copper-accelerated — how they differ from ASTM B117, and how to read results.
- Cross-Hatch Adhesion Testing (ASTM D3359)How cross-hatch adhesion tests work, how ASTM D3359 and ISO 2409 grades are read — they run in opposite directions — and how they apply to coil coatings.
- Air-Side Pressure Drop Testing After CoatingHow the air-side pressure drop of a coil is measured before and after coating, what to ask for in the report, and how to judge the result.
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