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Chemical exposure testing applications

Dan Olson
By Engaged Expert Dan Olson Metals, Nonmetals

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It is vital that your products are able to withstand harsh conditions involved in your components end-use. Investigative chemistry exposure testing can determine your product’s stability when exposed to a chemical or substance and can help you identify and resolve concerns in your product’s durability and lifetime. 

Compatibility studies can be performed to ASTM methods, your specifications, or a proprietary method. In addition, the testing can also be based on competitor claims or to duplicate a previous study.

Read on for examples of applications of chemical exposure testing.

Evaluate a product for changes in appearance

In a recent chemical exposure study, an entire product was exposed to three different liquid environments over a seven day period. In this case, the entire product was sprayed with an acid, a base, or an organic solvent once per day. The client asked that the entire product be evaluated for change in appearance of any part of the product including the label, screws, mating areas of connected components parts and each component part itself. We provided the images below to our customer showing the acidic, alkaline and organic solvent effects on the products following the chemical exposure. This allowed our client to determine if the products would satisfactorily withstand the harsh conditions they could be exposed to.

metallic surface compromised by acid
Figure 1: A metallic surface compromised by acid
pitting effects of alkali exposure.
Figure 2: Pitting effects of alkali exposure.
Chemical Exposure organic solvent
Figure 3: The window of the “open” indicator was affected by the organic solvent
Evaluate polymers for changes in weight, appearance and tensile strength

This study involved the exposure of three different polymers to two different solutions used in the oil industry. The study involved evaluating the sample at designated time intervals over varying temperature and solution conditions. At each stage of the chemical exposure experiment, our client asked for data (see table 1) relating to weight and appearance changes as well as tensile strength. The data was then provided to our customer enabling them to determine if their product would be fit for purpose.

Chemical Exposure Oil Industry
Figure 1: Change in appearance of the samples over the course of the study
Chemical Exposure Table
Table 1: Tensile data for the same polymer after one cycle of exposure.
Start a chemical exposure testing evaluation

Before a chemical exposure project can be performed, the parameters of the study must be defined.

Examples of these parameters include:

  • portion of sample to be exposed
  • number of specimens exposed to each environment
  • type of chemical environment
  • length of exposure time
  • criteria for evaluation.

Evaluation criteria may include:

  • visual evaluation
  • change in mass
  • change in volume
  • dimensional changes such as length, thickness, diameter, hardness evaluation, and other physical dimensions.

Our Engaged Experts will help guide your chemical exposure evaluation criteria to ensure the project scope meets your needs. For more information, please contact us or call US +1888 786 7555 or UK +44 808 234 1667.

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