Photo cationic initiators


Cas : 61358-25-6

Physical characteristics


  • Generates HPF6
  • Does not include harmful heavy metals.
  • It hardly colored cured material.
  • Since it is powder, accurate weighing is possible, it is suitable for curing system without solvent.
Molecular formula
Chemical name Bis(4-tert-butylphenyl)iodium hexafluorophosphate
CAS RN® 61358-25-6
Molecular weight 538.29

Physical characteristics

Color white - light yellow
Appearance powder - crystalline powder
Melting point/freezing point 174℃
Solubilities water : practically insoluble, or insoluble.
PGMEA (1-Methoxy-2-propyl acetate) , ethyl acetate, acetone,
methanol : freely soluble.


Absorption spectrum of WPI-170
※When used in combination with a sensitizer, it shows photosensitivity even in the long wavelength region.


PGMEA >50%
Ethyl acetate 33%
Acetone 16%
Methanol >50%
H2O Insoluble

[Unit : w.t/100mL,20℃]

Related laws and regulations

TSCA Not Listed
EINECS Not Listed
REACH Not Listed