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NIOSH

PERCHLORIC ACID (72% SOLUTION)

ICSC: 1006

Hydronium perchlorate
ClHO4
Molecular mass: 100.46
ICSC # 1006 		CAS # 7601-90-3
RTECS # SC7500000
UN # 1873
EC # 017-006-00-4
April 10, 2000 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Not combustible but enhances combustion of other substances. Many reactions may cause fire or explosion. Gives off irritating or toxic fumes (or gases) in a fire.
NO contact with combustibles and reducing agents .
In case of fire in the surroundings: water spray .
EXPLOSION Risk of fire and explosion on contact with metals, reducing agents ,organic material.
Do NOT expose to friction or shock.
In case of fire: keep drums, etc., cool by spraying with water. Combat fire from a sheltered position.
EXPOSURE
PREVENT GENERATION OF MISTS! AVOID ALL CONTACT!
IN ALL CASES CONSULT A DOCTOR!
•INHALATION Corrosive. Sore throat. Burning sensation. Cough. Laboured breathing. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection. Ventilation system must be specifically designed and maintained for perchloric acid.
Fresh air, rest. Half-upright position. Artificial respiration if indicated. Refer for medical attention. See Notes.
•SKIN Corrosive. Redness. Pain. Serious skin burns.
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention.
•EYES Corrosive. Redness. Pain. Permanent loss of vision. Severe deep burns.
Face shield, or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
•INGESTION Corrosive. Sore throat. Abdominal pain. Burning sensation. Diarrhoea. Shock or collapse. Vomiting.
Do not eat, drink, or smoke during work.
Rinse mouth. Do NOT induce vomiting. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Evacuate danger area! Consult an expert! Do NOT absorb in saw-dust or other combustible absorbents. Absorb the spillage in inert material then remove to safe place. Cautiously neutralize remainder. Do NOT wash away into sewer. (Extra personal protection: complete protective clothing including self-contained breathing apparatus).
Fireproof. Separated from - see Chemical Dangers. Well closed.
Special material. Unbreakable packaging; put breakable packaging into closed unbreakable container.
O symbol
C symbol
R: 5-8-35
S: 1/2-23-26-36-45
UN Hazard Class: 5.1
UN Subsidiary Risks: 8
UN Packing Group: I
ICSC: 1006 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

PERCHLORIC ACID (72% SOLUTION)

ICSC: 1006

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PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID , WITH PUNGENT ODOUR.

PHYSICAL DANGERS:


CHEMICAL DANGERS:
May explode on heating. The substance decomposes on heating producing toxic and corrosive fumes . The substance is a strong oxidant and reacts violently with combustible and reducing materials, organic materials and strong bases, causing fire and explosion hazard. Attacks many metals forming flammable/explosive gas (hydrogen - see ICSC 0001). The acid is unstable if the concentration is over 72%; may explode by shock or concussion when dry or drying. Mixtures with combustible material (such as paper) may ignite spontaneously at room temperature.

OCCUPATIONAL EXPOSURE LIMITS:
TLV not established.
MAK not established.


ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation and by ingestion.

INHALATION RISK:
No indication can be given about the rate in which a harmful concentration in the air is reached on evaporation of this substance at 20°C.

EFFECTS OF SHORT-TERM EXPOSURE:
Corrosive. The vapour is very corrosive to the eyes, the skin and the respiratory tract. Inhalation of vapour or mist may cause lung oedema (see Notes). The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

PHYSICAL
PROPERTIES

Boiling point (decomposes): 19°C
Melting point: -112°C
Relative density (water = 1): 1.76 at 22°C
Solubility in water:
miscible
Relative vapour density (air = 1): 3.5

ENVIRONMENTAL
DATA

The substance is harmful to aquatic organisms.

N O T E S

DO NOT use perchloric acid in a hood designed for other purposes. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation is therefore essential. Immediate administration of an appropriate spray, by a doctor or a person authorized by him/her, should be considered. Rinse contaminated clothes (fire hazard) with plenty of water. NEVER pour water into this substance; when dissolving or diluting always add it slowly to the water.
Transport Emergency Card: TEC (R)-51G07

NFPA Code: H3; F0; R3; OX

ADDITIONAL INFORMATION



ICSC: 1006 PERCHLORIC ACID (72% SOLUTION)
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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