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LC4706 Phthaldialdehyde
for synthesis


Order number Packaging Quantity Price €
AC31706 Plastic bottle  10 g 33.3
AC31706 Plastic bottle 50 g 133.2


Product information
Synonyms OPA
Hill Formula C8H6O2
Chemical formula C6H4-1,2-(CHO)2
HS Code 2912 29 00
EC number 211-402-2
Molar mass 134.13 g/mol
CAS number 643-79-8


Chemical and physical data
Ignition temperature 480 °C
Solubility 53 g/l (20 °C)
Melting point 53 – 56 °C
Molar mass 134.13 g/mol
Density 1.13 g/cm3 (20 °C)
Bulk density 530 kg/m3
pH value 7 (53 g/l, H2O, 20 °C)
Boiling point 83 – 84 °C (1 hPa)
Flash point >110 °C


Safety information according to GHS
Hazard Statement(s) H330: Fatal if inhaled.
H302: Harmful if swallowed.
H314: Causes severe skin burns and eye damage.
H372: Causes damage to organs through prolonged or repeated exposure.
EUH014: Reacts violently with water.
EUH029: Contact with water liberates toxic gas.
Precautionary Statement(s) P233: Keep container tightly closed.
P271: Use only outdoors or in a well-ventilated area.
P280: Wear protective gloves/protective clothing/eye protection/face protection.
P301 + P330 + P331: IF SWALLOWED: rinse mouth. Do NOT induce vomiting.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Signal Word Danger
Hazard Pictogram(s)


Storage class Combustible substances, toxic
WGK WGK 3 highly water endangering
Disposal 9
Carcinogenic compounds and flammable compounds labelled “Highly toxic” or “Toxic”: container F. Alkyl sulfates are carcinogenic; Take particular care to avoid inhalation and skin contact. To neutralize alkyl sulfates, add dropwise (from a dropping funnel) to concentrated ice-cool Ammonia solution (Cat.No. 105426) with vigorous stirring. Before placing in container D, check the pH with pH Universal indicator strips (Cat.No. 109535).


Safety information
R Phrase R 25-34-43-50
Toxic if swallowed.Causes burns.May cause sensitization by skin contact.Very toxic to aquatic organisms.
S Phrase S 26-36/37/39-45-61
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear suitable protective clothing, gloves and eye/face protection.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).Avoid release to the environment. Refer to special instructions/ Safety data sheets.
Categories of danger toxic, corrosive, sensitizing, dangerous for the environment
Hazard Symbol


Dangerous for the environment


Transport information
Declaration (transport by sea) IMDG-Code UN 2923 CORROSIVE SOLID, TOXIC, N.O.S.(PHTHALDIALDEHYDE), 8 (6.1), II
Declaration (transport by air) IATA-DGR UN 2923 CORROSIVE SOLID, TOXIC, N.O.S.(PHTHALDIALDEHYDE), 8 (6.1), II


Toxicological data
LD 50 oral LD50 rat 178 mg/kg
LD 50 dermal LD50 rat > 2000 mg/kg


Assay (GC, area%) ≥ 98 %
Melting range
– lower value
≥ 54 °C
– upper value ≤ 56 °C
Identity (IR) passes test