Special Testing Needs Special testing? No problem. Let us know what your testing requirements are, and we will work with you on the type of testing needed, samples required, and pricing if any additional testing outside of our standard tests are needed. Here is an example of special testing in mercurous nitrate tested to ASTM B154. The Tungum tube test sample is cold formed by tightly coiling 5 turns around a 50mm diameter mandrel. The test specimen is completely immersed in the mercurous nitrate solution for 30 minutes then 24 hours. We look forward to working with you soon on your next project.