MaTestLab > Test Standards > ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100 % Relative Humidity
Last updated 12th March 2025
ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100 % Relative Humidity
ASTM D2247 outlines the fundamental principles and procedures for testing the water resistance of coatings. It involves exposing coated specimens to an atmosphere with 100% relative humidity, causing condensation on the test specimens. Understanding how coatings resist water is crucial for predicting their service life, as water can degrade coatings over time. Test failures under 100% relative humidity may result from various factors, such as coating deficiencies, substrate contamination, or inadequate surface preparation. Thus, ASTM D2247 is valuable for evaluating coatings individually or as part of complete coating systems.
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ASTM D2247 Introduction
ASTM D2247 mentions the basic principles and procedures for testing the water resistance of coatings by exposing coated specimens to an atmosphere maintained at 100% relative humidity, causing condensation to form on the test specimens. It’s valuable for evaluating both individual coatings and complete coating systems. Tests conducted at 100% relative humidity are commonly used for specification acceptance, quality control, and research and development of coatings and substrate treatments. The ASTM D2247 test typically results in a pass or fail determination, although the degree of failure may also be measured. A coating system is deemed to pass if there is no evidence of water-related failure after a certain period.
ASTM D2247 Test Method
Placing Specimens in a Heat Chamber
Coated specimens are placed inside a sealed chamber filled with a heated, saturated air and water vapor mixture. The temperature inside the chamber is typically maintained at 38°C (100°F).
Condensation
At 100% relative humidity (RH), even a slight temperature difference between the specimen and the surrounding vapor leads to the formation of condensation on the specimens. The duration of the test can be adjusted to vary the exposure condition.
Reporting Changes in Specimen Characteristics
Water permeates the coating at rates determined by the coating’s characteristics. Any effects, such as color change, blistering, loss of adhesion, softening, or embrittlement, are observed and reported.
D2247 Equipment and Sample Preparation
Specimen Detail
Each test includes a control specimen of paint with known durability. These control specimens help detect any changes in test severity within a specific apparatus and can also reveal variations in test severity among different apparatuses.
Specimen Size
At least two replicate specimens of each coating are used to account for variations between specimens and in test conditions with the apparatus.
D2247 Test Result and Interpretation
Tests at 100% relative humidity are commonly used for specification acceptance, quality control, and research and development of coatings and substrate treatments. They usually result in a pass-or-fail outcome, although the extent of failure may also be measured. A coating system passes if there’s no evidence of water-related failure within a specified timeframe. However, it’s important to only equate results from these tests with exposure to water in natural environments once a quantitative correlation for the specific coating or system has been established.
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Tests Related to ASTM D2247
ASTM D2247 is related to tests including ASTM D609 for cold-rolled steel panel preparation, ASTM D610 for determining the degree of rusting on painted surfaces, and ASTM D714 for determining the extent of blister formation on painted surface.
Use of D2247 in Various Industries
It is used in several industries to determine water resistance of coatings under 100% relative humidity. It ensures vehicle paints can resist humid environments, checks structural integrity in construction, and verifies the reliability of electronics coatings.
Materials Commonly Tested with D2247
The standard is used for delamination, blistering or loss of adhesion of high-humidity resistance testing in metal substrates, paints, and polymeric finishes. It also includes weather-resistant wood and composite materials in humid or coastal exposure conditions.
Importance of D2247
The exposure of coated materials to a high-humidity environment means that this standard is a critical tool to ensure reliability and longevity of the coated materials. 100% relative humidity simulation will identify potential failures and enhance product quality, thus reducing maintenance costs and maintaining industry standards for safety and durability.
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The required number of samples or specimens should comply with the procedure given in the astm d2247 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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The turnaround time for astm d2247 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm d2247 tested?
You can share your astm d2247 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d2247 test to various testing techniques.
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