The sprawling plastics industry was also beset with the problem of how to dispose of waste PVC, which would cause serious pollution. And finally, factories had difficulties in disposing of used lubricants left over from the increasing number of machines, motors and engines in use in the Republic of China.
多年來，學術界與工業界想盡辦法要利用這些廢物，卻始終不能提出一個有效的辦法，這也是舉世煉鋁工業所共同感到困擾的問題。