- Perchloric acid, with more than 50% but not more than 72% acid
A clear colorless odorless aqueous solution.
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
Z Other (Z)
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
6.8 (25 C)
1.768 g/cm3 (22 C)
Solubility in water
1.42 (20 C)
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 full acid protective clothing and self-contained breathing apparatus resistant to acid corrosion.
Wear positive pressure self-contained breathing apparatus (SCBA).
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Neutralize spilled material with crushed limestone, soda ash, or lime.
Highly reactive under confinement, extreme caution.
May react vigorously or deflagrate when mixed with oxidizable material.
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.
Nonflammable-may heat combustibles to auto ignition point.
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.
Poisonous gases may be produced in fire.
Abnormal neuropsychologic function has been reported following hydrochloric acid exposure from a leaking tanker truck.
Ingestion of acids may result in burns, gastrointestinal bleeding, gastritis, perforations, dilation, edema, necrosis, vomiting, stenosis, fistula, and duodenal/jejunal injury.
Inhalation may produce dyspnea, pleuritic chest pain, upper airway edema, pulmonary edema, hypoxemia, bronchospasm, pneumonitis, and persistent pulmonary function abnormalities. Airway hyperreactivity has also been reported.
Contact may result in injury, burns and death.
Seek medical assistance.
Move to fresh air; give oxygen if necessary.
Flush with water.
Flush with water for at least 15 min.
USCG CHRIS Code
Std. Transport #