Zinc's connection to aluminium and nickel stayed unchanged as investors are cautious about these metals due to weak physical demand for them. Tie between zinc and copper edged down to 0.72 on Tuesday. Meanwhile, zinc's link with Standard Poor's SP500 (SPX) decreased on Tuesday as traders awaited key industrial data from the US due on Wednesday. Zinc and the pair EUR/USD interchanged at a stable level of about 0.74 during the last two weeks.