Is present in abundance in nature. the oxygen represents in weight 21% of the air we breathe .it is a colorless, odorless, and tasteless gas. It is essential for life and highly reactive with metals and other substances. Characteristics Highly oxidizing gas compressed at High Pressure. Grade, Industrial grade: 99.5% Min, Technical & Aviation :99.55 Min, Medical grade:99.0. Typical Applications Welding, Cutting, Hardening