Application Notes
Quick, Non-Destructive Screening for Defective Chinese Drywall
Handheld XRF's are used to test drywall quickly and easily without moving or destroying it. Drywall Detectors, LLC2 use Handheld XRF to compare levels of Strontium (Sr) and Sulfur (S) in domestic and imported drywall. They reported results for domestic (gray) drywall at levels less than 1,000 ppm for Strontium and at levels less than 1% for Sulfur; while defective Chinese drywall (blue) had elevated levels of Strontium at levels greater than 2,000 ppm and Sulfur with levels at or greater than 2%. Our Handheld XRF can measure up to 25 elements in a single test, including Sr, S, Fe, Ag, Cu and more.
XRF Testing of Drywall is Simple, Fast and Non-Destructive
Drywall Detectors tested intact drywall, defined as drywall that has undisturbed paper, intact on both sides. Essentially, it is tested as it was manufactured. For accuracy, they recommend testing a one square inch patch clear of paint and/or wallpaper. In most cases vent covers, outlets, attics and other unfinished areas provide testable drywall paper; however, in cases where they are not, the patch can be cleaned by scrapping, sanding or wire brushing.
1. Executive Summary, November 2009
2. www.drywalldetectors.com, Baltimore MD
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