Lin Chih-sen, a division chief at the IDB, says that from 1974 onwards the IDB began tightening the standard for mercury emissions, lowering it from 500 grams to 30 grams over five years. Finally, in August 1989, mercury cell electrolysis was completely eliminated from the production process.
工業局七組組長林志森指出，民國六十三年開始，工業局開始提高標準，五年內就從五百克降到三十克，最後索性在民國七十八年八月，將水銀電解槽完全趕出產業製程。