Metal finishing Q&As since 1989

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Replacing ABF with HF in an aluminium cleaner formula

Hi we currently have a problem in South Africa where we cannot source ABF and subsequently need to find a replacement that works the same. We are thinking of using HF instead but need to know the ratio if there is one. We where using the ABF in an Aluminium cleaner.

Robert Freitag
Chemical sales consultant - Durban South Africa
April 26, 2011

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There's no problem with making the substitution from a chemical point of view. The conversion depends on what % HF by weight acid you are buying. In the US, several technical grades are available. Adding 1% by volume to your tank if you are using HF that is 48% HF by weight would be equivalent (in fluoride) to 7.94 g/L addition of ammonium bifluoride. Adding 1% by volume to your tank if you are using HF that is 70% HF by weight would be equivalent to a 12.55 g/L addition of ammonium bifluoride.

Jon Barrows, MSF, EHSSC
GOAD Company

Independence, Missouri

April 27, 2011