... (48%)Stability: stableNational Standard Q/HD04-2000 ItemIndexFluoroboric acid(HBF4),% ≥49.5Free boric acid , % ≤2.5Ferrum(Fe), % ≤0.01Chloride, % ≤ ... 0.005Sulfate, % ≤0.03Main usage:Fluoroboric acid is a catalyst for aldehyde synthesis, a metal surface cleaner ... clean metal surface or before alloy electroplate. Fluoroboric acid is one component of preservatives for deactivating aluminum ...