... good quality and good price.shipment in time. Name: Hydrofluoric acid[7664-39-3] Molecular formula: HF Molecular weight: 20. ... GradeSecond GradeF-70F-70F-55F-60F-70F-55F-60HF, %min70705560705560Fluorosilicic Acid(H2SiF6),%max0.020.20.40.50.61.01.0Sulfate(SO4 ... Clear colorless fuming liquid,very easy to volatilize, to produce fluoride when reacting with metal salt, oxide and hydroxide, strong corrosion ...