Sometimes, the salt spray test will be needed for our products. After checking, we just known there are different types of salt spray tests, such as NSS, AASS, CASS etc.

NSS: Neutral Salt Spray
AASS: Acetic Acid Salt Spray
CASS: Copper Accelerated Acetic Acid Salt Spray

In short, NSS is the base of salt spray test, it was developed about 1930s, it is a neutral test which means the test solution pH value is at 6.5-7.2.
AASS is the method in NSS solution with addition of glacial acetic acid in the pH range of 3.1 to 3.3.
CASS is the method in AASS solution with addition of copper chloride in the pH range of 3.1 to 3.3.

Should I choose NSS, AASS, or CASS for my tests?

It is mainly based on the material and coating of your specimens.

The NSS is good for metals and their alloys, most metallic coatings, anodic oxide coatings, organic coatings.

The AASS is useful for testing decorative coatings of copper/nickel/chromium, or nickel/chromium. And for testing anodic coatings on aluminum

The CASS is useful for testing decorative coatings of copper/nickel/chromium, or nickel/chromium. And for testing anodic coatings on aluminum.

We, Labtek can produce a wide range of Salt Spray Test Chambers, from 108L to 1080L, from floor standing type to walk in salt spray test chamber, which can conduct the NSS, AASS, CASS test. Just contact our sales now to get professional suggestions.