Ceramic Coating Basics2 min read

Water Absorption and Water Beading: Measure the Property You Intend to Claim

Water beading describes surface behaviour, while water absorption concerns uptake into a material or system. A photograph of droplets cannot, by itself, quantify how much water the underlying specimen absorbs during an exposure.

Updated · NANOLAB Knowledge

The key distinction

ASTM's public description of D570 discusses water absorption in plastics and the importance of specimen and exposure conditions. For coating buyers, the broader lesson is to separate the surface observation from the uptake question. The appropriate method must match the substrate and the intended claim.

Practical checks

  1. State whether the question concerns wetting, absorption or another water-related property.
  2. Ask the laboratory to select an applicable method and specimen arrangement.
  3. Retain exposure time, specimen dimensions and preparation details in the report.

Example

Illustrative example: a treated sample shows rounded droplets during a short demonstration. That observation does not establish its water uptake after prolonged immersion or its suitability as a waterproofing system. A separate, relevant evaluation is needed for those claims.

Scope and limits

Do not apply a plastics test automatically to every coated building material or vehicle surface. This guide does not claim that any NANOLAB coating prevents water penetration. Product selection must follow the documented substrate and use approvals, with evidence appropriate to the requested outcome.

Related guidance

Technical references: ASTM D570: water absorption of plastics. These sources describe their stated methods or products; they do not certify NANOLAB products or establish compatibility with an unlisted surface.

Ask NANOLAB about the exact product and intended use. Use the current product documentation for formulation-specific instructions.