There are two systems for testing the lead content of paint: X-ray fluorescence (XRF) and laboratory testing through the National Lead Laboratory Accreditation Program. If your test results were delivered on-site at the time of testing, XRF testing was most likely used. If the test results came later, it was probably laboratory testing.
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If XRF testing was used, a lead content of 1 mg per square centimeter of painted surface is defined as leaded paint.
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If your XRF test results were inconclusive, it may be because of materials below the paint. It is possible to retest by removing some surface paint and establishing a reading of the material underneath as a base reading.
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If laboratory testing was used, determine whether your test results are being reported as a percentage or in terms of milligrams per square centimeter.
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If the laboratory test results are reported as milligrams per square meter, a lead content of 1 mg per square centimeter is considered leaded paint.
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If the laboratory test results are reported as a percentage, results of 0.5 percent lead constitute leaded paint.
The Drip Cap
- Today, most people realize the danger of having lead paint in the home, and it is seldom found in newer homes.
- If your XRF test results were inconclusive, it may be because of materials below the paint.
- If the laboratory test results are reported as milligrams per square meter, a lead content of 1 mg per square centimeter is considered leaded paint.