Do disposable wipes have to be 2 by 2 inches?

• A. Yes
• B. Only for certain surfaces
• C. Not required
• D. No

Answer: (D)

Wipe sampling is about covering a defined surface area so the amount of lead collected can be interpreted correctly. There isn’t a universal rule that disposable wipes must be exactly 2 by 2 inches. The method you’re following specifies the area to wipe (and often the wipe type), and you use whatever wipe size helps you adequately cover that area. If you use a wipe of a different size, you document the actual area wiped and adjust the calculations accordingly. In practice, you might wipe a 3x3 inch area, a larger 4x4 inch area, or multiple wipes to cover a defined surface, depending on the surface and method. The key is consistency and accurate area measurement, not a fixed 2x2 inch requirement.