Inorganic acid Alkali Other Mixed acid Concentration Temp. U-PVC C-PVC PP PVDF PTFE FKM EPDM FKM-F FKM-C Chemicals Concentration Temp. U-PVC C-PVC PP PVDF PTFE FKM EPDM FKM-F FKM-C Chemicals Concentration Temp. U-PVC C-PVC PP PVDF PTFE FKM EPDM FKM-F FKM-C Chemicals 14 35 10 30 10 30 ◎……Little or no effect ○……Slight effect △……Noticeable effect ×……Severe effect acid 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ △ ◎ ○ △ × ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ ◎ ○ △ × ◎ ○ ○ △ ◎ ○ △ × ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ ◎ ◎ ○ ○ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ △ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ × ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ △ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ○ × ◎ ◎ ○ × ○ ○ × ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ○ ○ ○ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ○ △ ◎ ◎ ○ △ Nitric acid HNO3 Hydrofluoric acid HF 40 5 30 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ × × × × △ × × × ○ ○ △ × ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ○ ○ ○ ○ ○ △ △ ◎ ◎ ○ △ × ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ △ × △ △ × △ × ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ △ × ◎ ○ △ ◎ ○ ○ △ × ◎ ○ △ ◎ ○ Sodium hydroxide (caustic soda) NaOH Ammonia water NH4OH 20 3 13 150g/l ＋ 200g/l 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 20 40 60 80 100 120 ◎ ◎ ○ ◎ ◎ ○ ◎ ◎ ○ ◎ ○ ○ △ △ ◎ ◎ ○ ○ ◎ ◎ ○ ◎ ◎ ○ △ △ ◎ ◎ ◎ ○ ○ ○ ○ ○ △ △ △ × ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ △ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ◎ ◎ ◎ ◎ ◎ ◎ ○ △ ◎ ◎ ○ △ △ △ × × △ ◎ ○ ○ △ ○ ○ △ × × ◎ ◎ ◎ ◎ ◎ ◎ ○ △ ◎ ◎ ○ △ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ △ ◎ ◎ ○ ○ △ △ × × Hydrogen peroxide Sodium hypochlorite H2O2 NaClO Nitric acid + Hydrofluoric acid HNO3 ＋ HF Aqua regia HNO3 ＋ 3HCl