ASTM G85 Modified Salt Spray (Fog) Testing

ASTM G85 is a standard practice that outlines the procedure for conducting modified salt spray (fog) testing to assess the corrosion resistance of metallic materials (ferrous and non ferrous), organic and inorganic coatings. The ASTM G85 test method simulates harsh environmental conditions, such as salt-laden atmospheres, to evaluate the performance of materials. The values stated in SI units are to be regarded as standard.


Introduction to ASTM G85

ASTM G85 establishes the standard practice for subjecting metallic materials to modified salt spray (fog) testing. This test method aims to evaluate the corrosion resistance of materials (ferrous and nonferrous metals; organic and inorganic coatings) when exposed to salt-laden atmospheres, simulating the effects of coastal or industrial environments. The results of the ASTM G85 test provide valuable information for material selection, quality control, and performance assessment in real-world corrosive environments. 

ASTM G85 test method is useful for evaluating durability of materials in various industries, including automotive, aerospace, and manufacturing. We have the best network of testing labs in the USA to carry out ASTM G85 test for our clients.

ASTM G85 Test Method

This practice covers conditions for five modifications in salt spray (fog) testing for specification purposes: Annex A1,  acetic acid-salt spray test, continuous; Annex A2,  cyclic acidified salt spray test; Annex A3,  seawater acidified test, cyclic (SWAAT); Annex A4,  SO2 salt spray test, cyclic; and Annex A5,  dilute electrolyte cyclic fog dry test.

Test ConditionsThe specimens are placed in a salt spray (fog) chamber, where they are exposed to a controlled mist of a salt solution. The chamber is maintained at a specific temperature, usually around 35°C (95°F), and the salt solution is atomized to produce a fog-like environment. The specimens are positioned in a way that avoids contact between them or with other metallic materials.
Exposure DurationThe duration of the test varies depending on the specific requirements and intended application. Common exposure periods range from 24 hours to several hundred hours.

ASTM G85 Specimens

Specimen detailsASTM G85 covers a wide range of metallic specimens, such as parts, components, or coatings.
Specimen dimensionsThe specific requirements for specimen size, shape, and surface preparation vary depending on the material and application being evaluated.
Specimen preparationSpecimen preparation guidelines include cutting, machining, or sampling techniques to obtain representative samples for testing.

ASTM G85 Results

The test method ASTM G85 provides observations and assessments of the specimens’ performance after exposure to the modified salt spray (fog) environment. The results typically include observations of corrosion, such as rust formation, blistering, or surface degradation. These results help in determining the material’s resistance to corrosion and evaluating its suitability for specific applications.

Tests Related to ASTM G85 ASTM B117 (Standard Practice for Operating Salt Spray (Fog) Apparatus) is a related standard that provides guidelines for operating salt spray (fog) apparatus.


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The required number of samples or specimens should comply with the procedure given in the astm g85 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 g85 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 g85 tested?

You can share your astm g85 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 g85 test to various testing techniques.

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