The test standard summaries are for general guidance only. Though believed to be accurate at the time of writing, this may change over time. So this information should not be used as a substitute for referring to a complete test standard, at an appropriate revision level.
Note: the terms salt spray, salt mist & salt fog are all in wide spread use within corrosion test standards. In this context they can be considered to be equivalent and interchangeable terms.
BS 3900 Part F4
Resistance to continuous salt spray
Can be used to test the relative resistance to corrosion of painted samples, when exposed to a salt spray climate at an ambient temperature.
Test specimens are placed in an enclosed chamber and exposed to a continuous indirect spray of synthetic sea water solution, which falls-out on to the specimens at a rate that consumes between 1.0 and 1.5 litres of salt solution per hour, in a chamber temperature of +20C. This climate is maintained under constant steady state conditions. The test duration is variable.
This test is also referred to as a ‘cold’ salt spray test.
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