ASTM D870 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion

ASTM D870 tests the water resistance of coatings by partially or fully immersing specimens in distilled or de-mineralized water at ambient or elevated temperatures, focusing on water-only immersion tests. The ASTM D870 practice focuses on water immersion tests, without specifying specimen preparation or results evaluation. Results of ASTM D870 are stated in SI units as they are considered standard units.


Introduction to ASTM D870

ASTM D870 is a widely accepted method as water immersion can damage coatings, affecting their service life. It helps to predict 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, determining pass or fail, with no water-related failure after a specified time.

The testing apparatus used for the ASTM D870 test is relatively inexpensive and can be as simple as a glass beaker with a stirrer available in a testing lab. It is also possible to use very large tanks for testing coated pipe or other large coated products to carry out the ASTM D870 test.

Test Procedure of ASTM D870

ASTM D870 specifies the withstanding ability of coatings by using the water immersion method.

Test Setup and ExecutionASTM D870 specifies that a tank is filled with water, test specimens are immersed for three-quarters of their length, and then heated to the desired temperature. Specimens are parallel to the water flow, and water is replaced if it becomes cloudy or colored. The original water level is maintained if needed.

ASTM D870 Test Specimens 

Specimen DetailsASTM D870 specifies that 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.
LimitationsASTM D870 doesn’t cover specimen preparation. The composition and surface preparation of the substrate, the number of specimens, and specimen preparation is decided before testing.

Results of ASTM D870

The ASTM D870 results drawn from this test provide significant information about the coating’s performance, its suitability for specific applications, and the expected service life of the coated product in outdoor or wet environments. Moreover, ASTM D870 allows for the comparison of different coatings or formulations. By testing multiple coatings under the same conditions, it becomes possible to identify which one performs better in terms of water resistance.

Tests Relevant to ASTM D870

The tests relevant to ASTM D870 include ASTM D2247 (Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity) and ASTM D4585 (Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation).


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.

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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.

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