Why 70% Isopropyl Alcohol Is a Better Disinfectant Than 99 "Isopropyl alcohol 99 percent is pure isopropanol and isopropyl alcohol 70 percent is pure isopropanol diluted with 30 percent purified water by volume," explains Dr Lucky Sekhon, fertility specialist and board certified OBGYN in New York City"Isopropyl alcohol 70 percent, or isopropyl alcohol 99 percent diluted to 70 percent with purified water, kills organisms by denaturing their proteins
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