Provenance

Reference data from EU CLP Annex VI and published regulations — verify against your supplier's SDS before use.

Build a label

Substance profile

Perchloric Acid

Perchloric Acid is colorless, oily liquid and is odorless.

CAS 7601-90-3 Danger

01 · Identification

What Perchloric Acid is

Perchloric Acid is colorless, oily liquid and is odorless. It melts at -112 °C, is miscible with water.

Under the GHS it carries the signal word Danger. It is classed as reactive agents - 3rd degree.

CAS number7601-90-3
EC number231-512-4
Index number017-006-00-4
Chemical class Reactive agents - 3rd degree

Other names for Perchloric Acid

  • perchloric acid ... %

02 · GHS classification

Hazards and label elements

Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.

Signal wordDanger
Hazard statements assigned to Perchloric Acid
CodeHazard statement
H271 May cause fire or explosion; strong oxidiser.
H314 Causes severe skin burns and eye damage.

Precautionary statements: P260, P280, P301, P310, P331

03 · Physical and chemical properties

Perchloric Acid properties

Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.

Property Value Conditions Source
Boiling point 19 °C (66.2 °F) at 11 mmHg (reduced pressure) HSDB
Melting point -112 °C (-169.6 °F) HSDB
-112.22 °C (-170 °F) CAMEO
Density 1.768 g/cm³ at 22 °C HSDB
1.76 g/cm³ at 22 °C ICSC
25 g/cm³ at 25 °C HSDB
Solubility MISCIBLE IN COLD WATER HSDB
Solubility in water: miscible ICSC
Vapor pressure 6.8 mmHg Haz-Map
Lower explosive limit (LEL) DECOMP WHEN DISTILLED AT ATMOSPHERIC PRESSURE, SOMETIMES WITH EXPLOSIVE VIOLENCE. ... UNDERGOES SPONTANEOUS & EXPLOSIVE DECOMP... HSDB
Vapor density 3.5 (air = 1) ICSC

Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.

04 · Fire and explosion

Fire and explosion behaviour of Perchloric Acid

These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.

Fire and explosion

SOME INORG MATERIALS, SUCH AS HYPOPHOSPHITES, TEND TO FORM EXPLOSIVE MIXTURES WITH PERCHLORIC ACID WHEN HOT. EXPLOSIONS MAY OCCUR WHEN 72% PERCHLORIC ACID IS USED FOR DETERMINATION OF CHROMIUM IN STEEL. ...REACTION OF ANHYDROUS...ACID WITH SULFUR TRIOXIDE IS VIOLENT...DROP OF ANHYDROUS...ACID ON WOOD FIBERS OR DUST CAUSES VIOLENT EXPLOSION. ANHYDROUS PERCHLORIC ACID CAN DECOMPOSE EXPLOSIVELY @ ATMOSPHERIC PRESSURE. WHEN BIS(2-HYDROXYETHYL)-TEREPHTHALATE, BEING REFLUXED WITH 5% PERCHLORIC ACID IN ETHYL ALCOHOL, WAS ALLOWED TO GO TO DRYNESS, THERE WAS A VIOLENT EXPLOSION.

Source: HSDB

EXPLOSIONS INVOLVING.../ACETIC ACID AND PERCHLORIC ACID/ HAVE OCCURRED IN ELECTROLYTIC POLISHING BATHS. VIOLENCE IN SOME CASES APPROACHED THAT OF A TRUE HIGH EXPLOSIVE. CONTACT OF HOT, CONCN PERCHLORIC ACID WITH ALCOHOLS OR CELLULOSE IS PARTICULARLY DANGEROUS. ...ANILINE TREATED WITH PERCHLORIC ACID, THEN FORMALDEHYDE, GIVES RESINOUS CONDENSATION PRODUCT WHICH BURNS WITH EXPLOSIVE VIOLENCE. ...DROP OF ANHYDROUS...ACID IN DIETHYL ETHER CAUSES...EXPLOSION. DROP OF ANHYDROUS PERCHLORIC ACID ON CHARCOAL CAUSES VIOLENT EXPLOSION. ...70% PERCHLORIC ACID SOLN REACTS INSTANTLY & EXPLOSIVELY ON CONTACT WITH DIBUTYL SULFOXIDE.

Source: HSDB

05 · Handling and storage

Storing and handling Perchloric Acid

Storage conditions

REAGENT BOTTLE--MAX 1-LB, GLASS-STOPPERED, GLASS BOTTLE; KEPT IN A HEAVY GLASS TRAY WITH LARGER CAPACITY. ADDN LAB STORAGE SHOULD BE IN ORIGINAL BOTTLES INSIDE A GLASS CONTAINER PADDED WITH GLASS WOOL & HAVING GREATER CAPACITY THAN THE CONTAINER. CARBOYS & LARGE BOTTLES SHOULD BE STORED ON ACID-RESISTING NONCOMBUSTIBLE SHELVES, IN A NONCOMBUSTIBLE STRUCTURE. ALL STORAGE MUST BE SEPARATED FROM COMBUSTIBLE MATERIALS, ORG MATERIALS, STRONG DEHYDRATING AGENTS, OXIDIZING & REDUCING AGENTS. ...MUST BE STORED WHERE IT WILL NOT FREEZE... PROTECT AGAINST PHYSICAL DAMAGE. ELECTRICAL WIRING...IN STORAGE AREAS MUST BE OF WATERTIGHT TYPE TO PROTECT AGAINST CORROSIVE ACTION OF VAPORS.

Source: Hazardous Substances Data Bank (HSDB)

Incompatible materials

MIXTURES OF.../ACETIC ACID, PERCHLORIC ACID AND ACETIC ANHYDRIDE/ HAVE VARYING DEGREES OF SENSITIVITY TO SHOCK. ...ADDITION OF ACETIC ANHYDRIDE TO AQ SOLN OF PERCHLORIC ACID CAUSES FORMATION OF ACETIC ACID WHICH CAN REACT VIOLENTLY WITH PERCHLORIC ACID.

Source: Hazardous Substances Data Bank (HSDB)

Reactivity

PERCHLORIC ACID, WITH MORE THAN 50% BUT NOT MORE THAN 72% ACID is a solution of a strong oxidizing acid. May react vigorously or deflagrate when mixed with oxidizable material [Merck]. This includes (but is not limited to) alcohols, amines, boranes, dicyanogen, hydrazines, hydrocarbons, hydrogen, nitroalkanes, powdered metals, silanes, or thiols [Bretherick 1979. p.174]. Perchloric acid ignites on contact with sulfinyl chloride. (Bailar, 1973, Vol. 2, 1442).

Source: CAMEO Chemicals

Planning storage for a mix of chemicals? Check Perchloric Acid in the storage compatibility matrix →

Get the free GHS / CLP / OSHA deadline calendar

Verified 2026–2029 compliance dates in one PDF — plus alerts when the rules change.