For acid and alkali contact with the working environment, such as phosphate fertilizer manufacturing, sea salt. Cover rubber blending and excellent acid and alkali inert materials, than the chloroprene rubber acid conveyor belt performance better. The skeleton material uses the polyester canvas, is more reliable than the cotton core acid and alkali resistance performance, generally makes the circular conveyer belt. The acid and alkali resistant of the acid and alkali resistant conveyer belt coveing layer is as the following table: Classificationimmersion solutiondensitysoaking condition Temperaturextimesoak the rate of change of front and back performance Volume expansion ratechange rate of strength A1hcl18%5096h+10% following-10% within A2h2so450%5096h+10% following-10% within A3naoh48%5096h+10% following-10% within