When sourcing zirconium plates, you must prioritize ASTM standards, specifically ASTM B551 for strip, sheet, and plate. Ensure the material grade matches your application: R60702 (Unalloyed Zirconium) is the most common for chemical processing due to its superior corrosion resistance, while R60705 (Zirconium-Niobium alloy) offers higher mechanical strength. Key metrics include a purity level of ≥99.2%, specific tensile strength (min 380 MPa for R60702), and surface finish (cold-rolled or hot-rolled/pickled) to prevent localized pitting.