Degree of blistering
Assess formation, size, and density of blisters on coated surfaces.
Overview
Condensation humidity to reveal coating weaknesses
A temperature differential inside the exposure chamber creates a uniform condensate over the coated surface. Continuous 100% RH exposure accelerates moisture-related degradation to screen resistance, validate processing, and compare coatings. Large components can be tested whole.
Applicable to flat panels, large parts, and 3D objects; ISO/IEC 17025:2017 accredited
procedures.
Method
Water-fog / 100% RH exposure
Specimens are placed in a water-fog apparatus where controlled humidity and temperature produce uniform condensation. The method is suitable for benchmarking water resistance of paints and coatings across diverse substrates and geometries.
Preparation
Specimen preparation & panels
Standard reference coupons (rectangular geometry) are prepared using simultaneous application techniques—e.g., dipping—followed by controlled drying at specified time/temperature. Standard steel panels and aluminium/aluminium-alloy surfaces can be prepared per method to ensure uniformity and reliable comparisons.
Evaluation
What we examine post-exposure
Degree of rusting
Visual grading of rust on painted/coated steel using a standardized scale.
Scribed creepage & adhesion
Panels may be scribed per standard methods; creepage along the cut evaluates adhesion.
Uniform film thickness
Produce and verify uniform coating films on test panels for consistent results.
Scope
Our services (Paints & Coatings)
- Preparation of standard steel test panels before applying paint/coatings.
- Evaluating degree of blistering of paints after water-fog exposure.
- Evaluating degree of rusting on painted steel surfaces post-exposure.
- Producing films of uniform thickness on test panels.
- Evaluation of scribed specimens (creep at cut/scratch).
- Preparation of aluminium & aluminium-alloy surfaces for painting.
- Testing water resistance of coatings in a water-fog environment.
Reporting
What you receive
- Exposure conditions (time, humidity, temperature) and chamber controls.
- Photographic records at scheduled intervals and visual grading notes.
- Summary of coating performance including blistering, rusting, and creepage observations.
Get in touch
Talk to an expert
Share substrate, coating stack, target exposure duration, and acceptance criteria. We’ll confirm chamber setup, inspection cadence, and reporting format.