Irgacure 1173 Darocur 1173 CAS 7473-98-5

CAS: 7473-98-5

MF: C10H12O2

MW: 164.2

EINECS: 231-272-0


Properties of Irgacure 1173 Darocur 1173 CAS 7473-98-5

Appearance: transparent to yellowish liquid
Density: 1.077 g/mL at 25 °C(lit.)
Melting Point: 4°C
Flash Point: >230 °F
Boiling Point: 102-103 °C4 mm Hg(lit.)
Refractive Index: n20/D 1.533(lit.)

Applications of Irgacure 1173 Darocur 1173 CAS 7473-98-5

Irgacure 1173, the formal name is 2-Hydroxy-2-methyl propiophenone, short for HMPP, is one of the most widely used non-yellowing UV photoinitiators. It plays an important role in photocuring technology, because of its advantages of high initiation efficiency, good thermal stability, yellowing resistance, good storage stability, etc.

As a liquid photoinitiator, DAROCUR 1173 has excellent compatibility and can easily mix well with other photoinitiators and prepolymers. For example: DAROCUR 1173 is soluble in toluene, acrylate, methacrylate, etc., and  easy to mix with resin. Its absorption wavelength is 240nm~340nm.

Irgacure 1173 belongs to free radical type I photoinitiator, which is mainly used for UV curing reaction, such as UV curable coatings, UV curable ink, UV curable adhesive and other products as radiation curing initiator.

DAROCUR 1173 has been tested as an ultraviolet curable varnish of acrylate series for paper, metal and plastic surfaces. Particularly recommended for UV coatings requiring only slight yellowing even when exposed to sunlight for a long time. The recommended dosage is as below:

  • For Coating thickness 5-20μm, require 2%–4 % DAROCUR 1173
  • For Coating thickness 20-200μm, require 1%–3 % DAROCUR 1173