ASTM D870 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
ASTM D870 evaluates coating water resistance through immersion in distilled or deionized water at various temperatures. This practice focuses on the immersion process itself rather than specimen preparation or specific evaluation criteria. This test provides a standardized methodology to observe physical changes or failures in the coating system over time.
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ASTM D870 Introduction
ASTM D870 (Standard for Testing Water Resistance of Coatings Using Water Immersion) is a widely accepted method, as water immersion can damage coatings and affect their service life. It predicts failures due to coating deficiencies, substrate contamination, or inadequate surface preparation. Water immersion tests aid in coatings and substrate treatment research, specification acceptance, and manufacturing quality control. It is used for research and quality control, and it determines pass/fail based on damage resistance over time. Accelerating corrosion processes like pitting, it helps engineers predict coating effectiveness before service.
Other test methods to evaluate water resistance include ASTM D1735 (water fog), ASTM D2247 (100% humidity), and ASTM D4585 (controlled condensation
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Get Certified ASTM D870 for Uncompromising Quality and Project Success
ASTM D870 certification proves a laboratory can accurately measure coating water resistance through controlled immersion. It guarantees compliance with global standards, ensuring consistent results across manufacturers. By using this certified method, companies assess durability, identify weaknesses, and verify specifications. This certification boosts product reliability, market acceptance, and quality assurance.
Water Immersion Testing Equipment
What are the Testing Procedures and Requirements?
In the ASTM D870 testing procedure, coated specimens are immersed in water (distilled or saline) under controlled temperature conditions for a specified duration. Defects such as blistering, peeling, or corrosion are periodically inspected to assess coating performance.
Preparation of Coated Panels
Apply coating uniformly on clean substrates; allow full curing; ensure consistent film thickness and defect-free surfaces.
Water Immersion Setup
Immerse panels fully in distilled/deionised water; maintain controlled temperature (25–38°C); ensure no trapped air bubbles.
Exposure Duration
Keep specimens submerged for the specified time (24 hours to several weeks), depending on coating performance requirements.
What is the Scope of ASTM D870?
Guides testing protocols to evaluate how well coatings withstand continuous water immersion.
Ensures reliable and uniform assessment of water-induced coating degradation.
Suited for both experimental research and industrial quality assurance applications.
Compatible with both manual and computerized environmental testing equipment.
What is the equipment requirement and Sample Preparation for ASTM D870
Specimen Details
A control specimen of paint with known durability is used in each test. Such control specimens reflect variations in test severity between several apparatuses and can signal changes in test severity in a specific apparatus. To account for variations among specimens and test conditions within the apparatus, at least two replicated specimens of each coating type are used.
Substrate Material
Metal (steel, aluminum), wood, or plastic panels, depending on coating type. Substrate must be compatible with the coating system.
Specimen Dimensions
Common dimensions range from 75 × 150 mm to 100 × 150 mm, or as specified by the coating manufacturer. Panels must fit without touching tank walls or other specimens.
What are the uses of ASTM D870
• Testing of marine, industrial, and architectural protective coating.
• Confirmation of the performance of corrosion protection.
• Clear coat, primer, and topcoat testing in the automotive and aerospace market.
• Studies of waterborne finishes and new protection compositions.
• Coating performance measurement under the humid, wet, or submerged conditions.
What are the Common Challenges and Troubleshooting
Uneven curing, temperature fluctuations, contaminated water, and incorrect exposure times often cause problems. Mishandling specimens after immersion can also distort results. To reduce variability, laboratories control the pre-test environment and prevent air bubbles. Using automated immersion tanks with temperature control, adhering to strict curing protocols, and replacing water regularly increases testing reliability. Calibrated heaters and gauges maintain a consistent 35 °C in the salt spray chamber to ensure steady corrosion rates and reliable rust development. Standardized evaluation criteria and trained inspectors ensure consistent assessments of coating performance.
Testing Technique, Process, and Data Collection
Data collection involves documenting the frequency and intensity of defects using standardized rating scales. Photographic documentation and measurements of mass or dimensional shifts are recorded for comparison in evaluation. This data is essential for categorizing the performance of coatings and establishing a link between test results and anticipated environmental durability.
Analysis Results and Interpretation
ASTM D870 test shows how coatings respond to prolonged exposure to water immersion, identifying specific failures such as film softening, loss of adhesion, and osmotic blistering. Adequate interpretation depends on proper assessment of the severity of defects against established rating standards. These results serve as a critical justification for determining whether a coating is suitable for use in wet or submerged environments.
Factors to Consider for ASTM D870 Testing
Speed Automated immersion systems are used to speed up the diagnosis of large volumes of samples, which ensures a stable temperature and minimizes human interference.
Expert The technologists with the necessary skills who follow ASTM D870 provide proper preparation of the panel, immersion, and evaluation after exposure.
Cost ASTM D870 testing services are affordable, provide control of quality, reduce the risk of the project, and ensure compliance of the coating without reducing standards.
You can share your astm d870 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 d870 test to various testing techniques.
How much do I need to pay for the astm d870 test?
Please contact us for a detailed quote for your astm d870 testing needs. Cost incurred to carry out different astm d870 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm d870?
The required number of samples or specimens should comply with the procedure given in the astm d870 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm d870 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm d870 test?
The turnaround time for astm d870 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 d870 tested?
You can share your astm d870 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 d870 test to various testing techniques.
MaTestLab Inc. offers accessible, quick, and affordable material testing, product testing, and failure analysis services. We support your on-demand testing and expert consultation needs with the help of our extensive network of material testing laboratories situated in the US and other parts of the world.
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