1.temperature range:-40~130; 2.oil resistant performance: it is not allowed stiff and crisp after soaking within 90# gasoline, 10# fuel oil, alcohol over 72 hours separately.  3.basic cloth and rubber are bonded firmly, it is not allowed to peel off.  4.The finish should be smooth,soft, no fins, crack, mark left.  5.It is not allowed to have permeability and leakage when the diaphragm working under 50KPQ compressing air.  6.Material: rubber NH601(NBR)  basic cloth: T1