Glycolic acid (hydroxyacetic acid) is the first member of the series of alpha-hydroxy carboxylic acids, which means it is one of the smallest organic molecules with both acid and alcohol functionality. The product is manufactured by Chemours in the United States (Belle, WV) with excellent supply stability and outstanding quality.
Why Glycolic acid for concrete cleaners and dissolvers?
Glycolic acid is featured with a small molecular size and excellent water solubility that enables deep penetration in concrete residues and adequately reacts with particles from within. Due to its low corrosivity, it can be safely used on metal and equipment surfaces without causing etching or damage. It is also easier to dispose of than many other acids such as phosphoric and HCl, as it is readily biodegradable.
Glycolic acid corrosion study vs. other acids
The following table shows the corrosion rate of glycolic, phosphoric, and hydrochloric acids tested on 1018 carbon steel, 1100 aluminum, 304, and 316 stainless steel. The results are showing the % weight loss at 23°C (73°F) for 48 hours with no agitation.