ASTM B117 Salt Fog and Salt Spray Testing

Expert ASTM B117 salt fog and cyclic corrosion testing, with Houston’s largest salt fog (and cyclic) chamber and PhD corrosion consulting. B117 is widely used as a rapid method for evaluating coating and materials performance under highly corrosive marine conditions. ASTM B117 is commonly used for metals, plastics, woods, and coated materials of all kinds; ideally to compare two or more materials.

“We simulate years of seaside exposure in a month or less with ASTM B117”

We say ‘years’ because the exact amount depends on the conditions of exposure and there is no agreed-upon correlation factor; the goal of the test is to provide a uniform environment where different coatings and materials can be compared against each other. Whether you need to qualify a coating, test a new alloy, or evaluate materials for offshore service, we have the expertise and capabilities to help you rapidly determine the answer.

ASTM B117 Salt fog testing of coated metal samples by G2MT Labs

What Is the ASTM B117 Salt Fog/Salt Spray Test?

ASTM B117 Salt Fog and Salt Spray testing is relatively fast way to analyze the corrosion caused by salt water and chlorides on coated metals and alloys.  The ASTM B117 standard for operating a salt fog or salt spray cabinet, aka the “Salt Spray” or “Salt Fog” test, is a widely used corrosion test required by many companies and government agencies, including the US DoD and DoE. The purpose of salt fog testing is to collect corrosion resistance data from coated and non-coated alloys and also a wide variety of other materials including plastics (1, 2, 3).

How is the salt fog/ salt spray test performed?

The samples, which varies in size and shape, are exposed to a 5% salt fog or spray that is even distributed among the samples inside our B117 testing chamber. The sample chambers are checked twice daily for collection rates, water pH, and temperature throughout the test.OLYMPUS DIGITAL CAMERAThe salt fog testing conditions can vary depending on your requirements, but the most common are:

  • 35 degrees C
  • pH of 6.5 to 7.2
  • 5 parts sodium chloride to 95 environment
  • 30 days of testing (720 hours)

Should I test full-size parts?

That really depends on what you’re testing. If it’s a large components or system, then absolutely! Our biggest salt fog chamber is 8′ x 10′, and up to 7′ tall, so we can accommodate big structures or hundreds of samples at a time.  We have tested engines, car doors, frames, motors, metal booths, and large coated parts of all types, in both salt fog and cyclic corrosion conditions.

The option to test many parts at once helps ensure they all are exposed to the same daily conditions and fluctuations (otherwise there is some variance even between identical systems during normal operation).

Why should I choose G2MT Labs?

Quality: We designed and built our own corrosion analysis systems and know them inside and out.

Price: We are already very competitive on salt fog testing price and offer reductions for testing multiple samples.

Service: Our team is passionate about what we do and it shows in our work. You’ll see when you talk to us!

Expertise: The Houston corrosion laboratory is overseen by a PhD metallurgist with degrees from MIT and CSM. The corrosion laboratory is managed by a well-qualified laboratory manager, and we have years of experience in a wide range of corrosion analysis.

What is the accuracy of the test and how will my results look?

The test results can be examined visually to measure the integrity of the alloy and or its coating. Comparisons of pre- and post-testing photos will be taken and if needed a comparison of a corroded sample from the field may also be used. Weight loss or gain are recorded before and after exposure to estimate the corrosion rate. Monitoring of pH and water collection is performed at the twice a day. Then we provide a thorough report with data, analysis, pictures, and discussion that helps you understand and apply the results.

"ASTM B117" "Corrosion" "Salt fog test" Salt spray test"

ASTM B117 Infographic

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Should I use the Salt Spray/Salt Fog Test?

Finding the right corrosion test can be difficult but a few tips may help to see if the ASTM B117 will be beneficial. Common materials that can be tested using the salt spray test are:

Severe corrosion of tubing in a seaside location - ASTM B117 is an accelerated test for this type of corrosion - by G2MT Labs

  • Paints
  • Organic coatings
  • Phosphated surfaces
  • Zinc and Zinc-alloy platings
  • Electroplated chromium, tin, nickel, copper
  • Non-electrolytic coatings

What other tests do you provide?

There are many other versions of the salt fog test we can provide:

ISO 9227
GM 4298P
HES D6001 Sec. 4.3,
D6501 Sec. 3.15.1 &
ISO 9227
TSH 1552G
JIS Z2371
Mil-Std 810 Salt Spray Testing
NES M0140
SAE J2334 – Evaluation of corrosion resistance in automotive parts
ASTM G198 – Evaluation of metal corrosion in wood

and other company or industry specific standard tests.


What size samples can you fit?

We have three different testing chambers including a small medium and large chamber. The large chamber is 6′ x 8′, making it  capable of testing multiple large systems are assemblies simultaneously or hundreds of smaller parts.

What info is needed for a quote?

Please tell us (or we can help you selected these):

  • The preferred duration of the testing (30 days is common)
  • Relevant details of the planned usage environment


Additional ASTM B117 Salt Fog and Salt Spray Resources:

The use of ASTM B117 to evaluate stainless steel alloys -PDF

Is the Salt Spray test any good? (

Salt Spray Testing Discussion

We look forward to hearing from you about your salt fog testing needs!