Consider using Zr 702 for washers stamped from sheet. They are generally the lowest cost and most available zirconium washer, and the lower yield strength makes them a bit more conformable to the adjacent metal surfaces than the higher strength grade Zr 705. Zr 702 is slightly more corrosion resistant than Zr 705 in concentrated halogen acids (e.g. HCl, HBr, HI).
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"Upgrading to Zirconium Fasteners for Enhanced Performance in Corrosive Applications"Please download to view full document