Acetylsalicylic acid

CAS Number
50-78-2
EC Number
200-064-1
Abbreviation
ASA

What is Acetylsalicylic acid?

Acetylsalicylic acid (CAS 50-78-2) is a synthetic salicylate derivative.

Where is Acetylsalicylic acid used?

  • Pharmaceutical manufacturing: active ingredient in analgesic, antipyretic and antiplatelet solid dosage forms such as tablets, effervescent formulations and coated pellets
  • Personal care: keratolytic and preservation-supporting agent in exfoliating creams, scalp treatments, anti-dandruff products and skin care solutions
  • Chemical intermediate: synthesis of salicylate-based compounds requiring controlled acetylation
  • Food-contact and specialty applications: antioxidant and mild acidulant properties
  • It also plays secondary roles in preservation and pH-related formulation work.

Good to know: USP, BP and Ph. Eur. specifications are standard for pharmaceutical procurement and quality assurance.

Commercial specifications

  • Particle size distribution often specified for tableting or coating
  • Bulk quantities for industrial buyers
  • Pharma-grade material typically requires CoA and residual solvent profiles

Other Names (Synonyms)

2-acetyloxybenzoic acid|Aspirin|ASA

Contact us for supply of Acetylsalicylic acid

Request Quote

What are the physical properties of Acetylsalicylic acid?

Melting Point 135 °C
Boiling Point 140 °C
Density 1.40 g/cm³
Flash Point 250 °C
Appearance Acetylsalicylic acid is a white crystalline solid with a slightly bitter taste. It is odorless but hydrolyzes in moist air to give an acetic acid odor
Color white
Form crystalline
Water Solubility 3.3 g/L (20 ºC)
Refractive Index 1.4500 (estimate)
Log P 1.190

How is Acetylsalicylic acid classified and handled safely? Learn More

Warning
GHS07· Irritant GHS08· Health Hazard

Hazard Statements

H302 Harmful if swallowed
H315 Causes skin irritation
H316 Causes mild skin irritation
H319 Causes serious eye irritation

Precautionary Statements

P203 Obtain, consult and follow expert instructions for use.
P233 Keep container tightly closed.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.

Which trade and regulatory codes apply to Acetylsalicylic acid?

HS Code 29182200
UN Number 1851
Storage Class 11 - Combustible Solids
WGK (Germany) 1
Call Request Quote