Effect of acids.Samples (5 g) of the produced CA were weighed precisely and, then, put into sulfuric acid with concen-trations of 10%, 20% and 30%. The samples were dried and weighed periodically for 4 days in order to determine the percentage of weight loss after each time period. With the objective of making a comparison between the produced CA
and two of the other known types of plastics, samples of poly-styrene, and polypropylene were exposed to the same test but only for 30% concentration of sulfuric acid.