Humidity Chamber Test


Condensation can often becomes a cause for corrosion and other coating defects as it permeates into the coating layer and comes into contact with the bare substrate. Humidity chamber testing evaluates the water resistance properties of a coating by placing it in an enclosed chamber containing a heated, saturated mixture of air and water vapor, maintained at 100% relative humidity. This 100% relative humidity environment makes it very conducive for the formation of condensation to develop on the coating when a surface and atmospheric temperature difference is detected. At regular intervals and after a specified period of time, the coated panels are examined for any detrimental effects caused by the condensation, such as color change, blistering, loss of adhesion, softening, or brittling.

Water condensation resistance test for coatings

ASTM Specifications

ASTM D2247
ASTM Title
Standard Practice for Testing Water Resistance of Coatings in 100 % Relative Humidity
This practice covers the basic principles and operating procedures for testing water resistance of coatings by exposing coated specimens in an atmosphere maintained at 100 % relative humidity so that condensation forms on all surfaces of test specimens.

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