Plastics from the aspect of hygiene. A contribution to the estimation of ultra-violet absorbers and light stabilizers from the aspect of hygiene.

In model elution tests migration of 2-hydroxy-3-n-octyloxybenzophenome and its isooctyl derivative from polystyrene and polyolefines and 3,5ditert. butyl 4-hydroxy-[2,4-ditert, butylphenyl]-benzoate from polypropylene always at two concentration levels was investigated. For determination photometric measurements in the ultraviolet zone of the spectrum after a previous separation by thin layer chromatography and gas chromatography was used. A very low elution of the studied substances into water and aqueous acid solutions simulated by a solution of acetic acid was found. Migration of the evaluated compounds into 50% alcohol attains---depending on the conditions of the experiment---values in the order of milligrammes per one square dm of the surface of the plastic and is, moreover, 3 to 20 times higher in case of contact with fats or fat-simulating liquids. On the basis of the obtained results and after summarization of the toxicological data it was recommended to adopt a positive standpoint to all the compounds with a restriction of their amount in plastics except for the use of plastics containing these additives which come into contact with fats or fat containing food.