- Perchloric acid, 50 - 72%
- Dioxonium perchlorate solution
- Hydronium perchlorate
Colorless to yellowish, odorless liquid.
In analytical chemistry as an oxidizer & for separation of potassium from sodium.
Registry Numbers and Inventories.
EC Index Number
Heating may cause an explosion; Oxidising; Corrosive
R 5 8 35
S 23 26 36 45
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
Decomposition point, °C
Vapor pressure, mmHg
29 (25 C)
Vapor density (air=1)
1.7722 g/cm3 (25 C)
Solubility in water
0.008 P (25 C)
69.0 erg/cm2 (25 C)
1.3 (20 C)8189
0.0011/K (20 C)
Heat of fusion
Heat of vaporization
Hazards and Protection.
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Wear rubber or neoprene gloves and additional protection including impervious boots, apron, or coveralls, as needed in areas of unusual exposure. Use chemical safety goggles and/or a full face shield where splashing is possible. Maintain eye wash fountain and quick-drench facilities in work area.
For emergencies, or instances where the exposure levels are not known, use a full-facepiece positive-pressure, air-supplied respirator. WARNING: Air purifying respirators do not protect workers in oxygen-deficient atmospheres. If the exposure limit is exceeded and engineering controls are not feasible, wear a supplied air, full-facepiece respirator, airlined hood, or full-facepiece self-contained breathing apparatus. Breathing air quality must meet the requirements of the OSHA respiratory protection standard (29CFR1910.134).
Ventilate area of leak or spill. Remove all sources of ignition. Wear appropriate personal protective equipment. Isolate hazard area. Keep unnecessary and unprotected personnel from entering. Contain and recover liquid when possible. Use non-sparking tools and equipment. Remove spilled perchloric acid by immediate and thorough washing with large amounts of water. Reduce with a weak reducung agent, (hypobisulfite or ferrous salt, plus sulfuric acid as an accelerator have been recommended), then neutralize with sodium carbonate or calcium oxide.
Unstable at ordinary temperature and pressure and can undergo explosive decomposition, especially at elevated temperatures or if allowed to dehydrate.
Incompatible with numerous materials, including combustible materials, organic chemicals, strong dehydrating agents, reducing and oxidizing agents. Reacts violently with benzene, calcium hydride, wood, acetic acid, charcoal, olefins, ethanol, sulfur and sulfuric acid.
May emit toxic chloride fumes when heated to decomposition.
Wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Not combustible, but substance is a strong oxidizer and its heat of reaction with reducing agents or combustibles may cause ignition.
Can react with metals to release flammable hydrogen gas. Reactions may cause fire and explosion. In the event of a fire, assume that organic materials are involved and that an explosion may occur. May form sensitive powerful explosive mixtures with organic materials.
Poisonous gases may be produced in fire.
Repeated exposure to dilute solutions may cause skin rash and possible sensitization.
Corrosive. May cause burns of mouth, throat, and stomach, nausea, vomiting and diarrhea.
Corrosive. Inhalation of vapors or mists will cause irritation with coughing, choking, and inflammation of the nose, throat, and upper respiratory tract.
Corrosive. Can cause severe burns with discoloration and pain.
Corrosive. Permanent visual damage may occur. Highly corrosive to tissue.
If swallowed, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an unconscious person. Get medical attention immediately.
Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Call a physician.
Immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Call a physician, immediately. Wash clothing before reuse.
Immediately flush eyes with plenty of water for at least 15 minutes, lifting lower and upper eyelids occasionally. Get medical attention immediately.
USCG CHRIS Code
Std. Transport #