Fluid Susceptibility Testing

Fluid Susceptibility testing of material determines the affects and resistance of exposure to fluids. Some commons fluids used to test contamination include fuels, lubricating oils, solvents, cleaning fluids, and many others.

Product manufacturers subject raw material to fluid susceptibility testing because there is a high probably that fluids will contaminate the product during it’s life cycle. The fluids mentioned above (fuels, oils, etc) commonly contaminate material either intermittently or over long periods. Physical, chemical, and electrical properties are inspected during and after testing. For example, the product should not show any cracking or swelling when exposed to fluids.

The fluid susceptibility testing procedure depends on some variables such as fluid used and standard. It fluid solution or chemical can be immersed, sprayed, brushed, etc. The test laboratory should typically have a device to measure fluid temperature, pre-test/pre-soak equipment, and appropriate post measurement equipment. Each fluid or chemical’s datasheet and product specification must be reviewed for safety and health hazard reasons.

Raw material and component manufacturers test for fluid susceptibility and contamination affects. Fluid resistance is important for products used in different environments such as low/high temperature, indoor/outdoor, and land/air. Electrical qualification testing also tests for fluids like alcohol cleaner.

An example of a fluid susceptibility test method standard is FED-STD-791 which is the federal standard for testing lubricants, liquid fuels, and related products. The document covers a wide range of subjects from cloud intensity to dirt deposits. MIL-PRF-28876, which is a qualification test program for fiber optic connectors, also calls out fluid testing. The requirements is that the connector shall not reveal swelling or softening of material. Also, the sealing capability of the connector and other detrimental effects shall occur.

Experior Labs stocks common contaminants of interest include cleaning agents, lubricants, insecticides, and fuels. Experior also stocks some of the more exotic fluids used for military and aerospace applications as detailed in MIL-STD-810, RTCA/DO 160, TIA-455-12, EN3909 and has the ability to expose components and assess their reactions in accordance with standardized industry test methods. Our laboratory has the equipment and measurement devices to test many different product. As always, Experior engineers and technicians take the necessary safety precautions before, during and after the test.

Keywords: Fluid Susceptibility Testing, MIL-STD-810, RTCA/DO 160, TIA-455-12, EN3909