In the context of mg/cm2, which value represents the threshold corresponding to 0.05% lead by weight?

In the context of mg/cm2, which value represents the threshold corresponding to 0.05% lead by weight?

• A. 0.5 mg/cm2
• B. 1.0 mg/cm2
• C. 2.0 mg/cm2
• D. 0.1 mg/cm2

Answer: (B)

Lead loading on a surface is measured in milligrams of lead per square centimeter (mg/cm2). To convert a weight percentage to mg/cm2, you multiply the lead weight fraction by the amount of paint per unit area (the dry film weight per cm2) on the surface. In this test’s standard conversion, a coating with 0.05% lead by weight corresponds to about 1 mg of lead per square centimeter. Therefore, 1.0 mg/cm2 is the threshold associated with 0.05% lead by weight. The other numbers would require assuming a different amount of paint per unit area or a different conversion, which isn’t the standard used for this item.

Lead loading on a surface is measured in milligrams of lead per square centimeter (mg/cm2). To convert a weight percentage to mg/cm2, you multiply the lead weight fraction by the amount of paint per unit area (the dry film weight per cm2) on the surface. In this test’s standard conversion, a coating with 0.05% lead by weight corresponds to about 1 mg of lead per square centimeter. Therefore, 1.0 mg/cm2 is the threshold associated with 0.05% lead by weight. The other numbers would require assuming a different amount of paint per unit area or a different conversion, which isn’t the standard used for this item.