2026-04-15Views：
In the salt spray test, the oil content of the compressed gas should be strictly controlled within 0.01 mg/m & sup3; this standard is based on the ISO 8573-1 compressed air quality level, the specific analysis is as follows:
international Standard (ISO 8573-1)
the standard divides the compressed air quality into several grades, of which the highest grade (Class 0) requires oil content ≤ 0.01 mg/m & sup3;. As a test to simulate extreme corrosive environment, salt spray test needs to use ultra-pure compressed air to avoid oil interference test results.
Domestic standard (GB/T 10125)
although GB/T 10125 does not directly specify the oil content, it clearly requires that the compressed air should be treated with "degreasing, drying and preheating. Combined with ISO standard, it can be inferred that the oil content of compressed air for salt spray test should reach Class 0 or Class 1(≤ 0.1 mg/m & sup3;) level.
Industry Practice
high-precision industries such as medicine and electronics have generally adopted the ISO 8573 Class 0 standard to ensure that compressed air will not introduce impurities to affect product performance. Salt spray test as a key means of material corrosion resistance evaluation, also need to follow this requirement.
interference test results
the oil may form a protective film on the surface of the sample, delaying the corrosion process and causing the test results to deviate from the true value. For example, the oil film may extend the corrosion time of the metal specimen several times, and it is impossible to accurately evaluate its salt spray resistance.
Contamination test equipment
the accumulation of oil in the salt spray test chamber will block the nozzle, corrode the pipeline, and affect the spray uniformity and equipment life. For example, grease may cause the nozzle hole diameter to become smaller, causing the salt spray settlement to deviate from the standard value (1.0 to 2.0mL/(h · 80cm²)).
Violation of standard requirements
if the oil content of the compressed air used in the test exceeds the standard, the test results may be judged invalid, and the test needs to be re-tested, increasing time and cost.
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