Molecular oxygen

Molecular oxygen is a diatomic gas with the chemical formula O2 and CAS number 7782-44-7. It is an essential element for life and combustion processes, representing approximately 21% of Earth's atmosphere. This colorless, odorless gas has a molecular weight of 31.999 g/mol and is classified as an oxidizing gas under pressure. It supports combustion and is vital for respiration in most living organisms.

Molecular oxygen is a colorless, odorless, and tasteless gas at standard temperature and pressure. It has a boiling point of -183°C and a melting point of -218°C. The gas is slightly denser than air and is moderately soluble in water. It is paramagnetic and highly reactive, readily supporting combustion and oxidation reactions. Under pressure, it can be liquefied and stored in compressed gas cylinders.

Molecular oxygen serves numerous industrial and professional applications including steel production, metal cutting and welding, wastewater treatment, and chemical synthesis. It is essential in medical applications for respiratory therapy and life support systems. Other uses include glass manufacturing, paper bleaching, rocket propulsion, aquaculture for fish farming, and various oxidation processes in chemical industries. It also supports combustion in industrial furnaces and kilns.

Molecular oxygen requires careful handling due to its oxidizing properties and pressurized storage. Use appropriate personal protective equipment including safety glasses and protective clothing. Ensure adequate ventilation to prevent oxygen enrichment which increases fire risk. Keep away from heat sources, sparks, and flames. Use oxygen-compatible equipment and avoid contact with oils, greases, and organic materials. Regular equipment inspection and proper training are essential for safe handling.

Molecular oxygen must be stored in appropriate pressure vessels designed for compressed gases, in cool, dry, well-ventilated areas away from heat sources and combustible materials. Store cylinders upright and secured to prevent falling. Keep separate from flammable substances, oils, and organic materials. Ensure storage areas have proper ventilation and fire protection systems. Check cylinder integrity regularly and follow manufacturer's storage recommendations for temperature and pressure limits.

Molecular oxygen itself is not toxic, but oxygen-enriched atmospheres pose fire and explosion risks. If exposed to high concentrations, move to fresh air immediately. In case of oxygen-enriched clothing, remove contaminated garments carefully to avoid ignition sources. For cylinder leaks, evacuate the area and ensure proper ventilation. Seek medical attention if respiratory irritation occurs. In emergencies, contact emergency services and provide safety data sheet information.

Molecular oxygen disposal involves safely venting the gas to atmosphere in controlled conditions, as it is a natural atmospheric component. Empty cylinders should be returned to the supplier or authorized gas distributor for refilling or proper disposal. Never dispose of pressurized cylinders in regular waste. Ensure complete depressurization in well-ventilated areas away from ignition sources. Follow local environmental regulations and consult waste management authorities for specific disposal requirements.

Molecular oxygen is classified as ADR Class 2 dangerous goods for transport. It must be transported in DOT-approved pressure vessels with proper labeling displaying GHS03 and GHS04 pictograms and "Danger" signal word. Vehicles must carry appropriate documentation, emergency response information, and safety equipment. Drivers require hazardous materials training certification. Ensure proper ventilation during transport and avoid exposure to heat sources or mechanical damage to containers.

Molecular oxygen is regulated under various European frameworks including CLP regulation for classification as Oxidizing Gas Category 1 and Pressurized Gas. It requires appropriate hazard labeling with GHS pictograms GHS03 and GHS04. Transportation falls under ADR regulations for dangerous goods. While not listed as SVHC under REACH, suppliers must provide safety data sheets. Industrial users must comply with workplace safety regulations and pressure equipment directives for storage and handling systems.

Molecular oxygen is available through OYSI, a European distributor of technical chemicals and industrial gases. OYSI provides high-quality oxygen in various purities and cylinder sizes to meet industrial, laboratory, and professional requirements across Europe. As an established chemical distributor, OYSI ensures proper documentation, safety data sheets, and regulatory compliance for all oxygen deliveries. Contact OYSI directly for specific purity grades, quantities, and delivery options in your region.