What should be done with abrasives to avoid cross contamination?

• A. Rinse and reuse
• B. Store with other materials
• C. Not use abrasives used for other materials/mark it as only
• D. Mix abrasives

Answer: (C)

Cross contamination happens when grit from one material is carried onto another surface. Abrasives pick up particles and residues from the material you just worked, and those contaminants can ruin finishes, affect coatings or adhesives, and even cause corrosion or staining on the next part. That’s why the best practice is to designate abrasives for a single material and clearly mark or separate them so they aren’t used on other materials. If an abrasive has touched different metals, it should be avoided for subsequent work on those materials. Rinsing and reusing, storing with other materials, or mixing abrasives all increase the chance of transferring unwanted particles, so they’re not acceptable practices.