STORAGE OF ETHYLENE GLYCOL ANTIFREEZE IN UNLINED TIN CONTAINERS

The object of this study was to investigate the effect of pH on the package stability of mercaptobenzothiozole-borax inhibited ethylene glycol antifreeze compounds. The antifreeze compounds were packaged in unlined tin plated containers for a two-year period. Results show that antifreeze compounds with pH values below 10.3 caused corrosion in less than six months. Containers filled with compounds having pH values above 10.3 showed some corrosion in one year and were generally unsatisfactory after two years storage. Most of the attack was at the junction of the bottom and side seams of the containers.