Compressive strength testing of Hahn Plastic Ltd biofilter leg components exposed to concentrated acid

Twelve tenon-crowned leg components from Hahn Plastics Ltd’s biofilter floor system were subjected to compressive strength testing in order to investigate if their performance was affected by twelve weeks of exposure to extremely-low pH acid solutions. Of the twelve leg samples, four samples were not exposed to any acidic solutions in order to provide control samples. A further four samples were immersed during the twelve weeks in a pool of acid solution, while a final four samples were sprayed twice-daily for twelve weeks with acid solution in order to create streaks that would run down the sides of the legs, forming slight pooling at the bottom. Upon completion of the twelve week period, all twelve samples were subjected to identical compressive strength testing in a Denison loading frame, in accordance with the methodologies stipulated in BS EN ISO 604:1997.