Natural color：

Dilute color：

pigment yellow  191, product name is Pigment Yellow 191, alias is C.I. pigment yellow 191, CAS RN is 129423-54-7, molecular formula is C₁₇H₁₃CaClN₄O₇S₂, it has similar color light to C.I. pigment yellow 83, but better heat resistance.

Structural formula:

                    

Basic information

Product name:Pigment Yellow 191

Alias: -; C.I. Pigment Yellow 191; Pigment Brilliant Yellow HGR; c.i. 18795; 4-Chloro-2-[[4,5-dihydro-3-methyl-5-oxo-1-(3-sulfophenyl)-1H-pyrazol-4-yl]azo]-5-methylbenzenesulfonic acid calcium salt (1:1); PYRAZOLONE YELLOW HGR; Benzenesulfonic acid, 4-chloro-2-4,5-dihydro-3-methyl-5-oxo-1-(3-sulfophenyl)-1H-pyrazol-4-ylazo-5-methyl-, calcium salt (1:1); Pigment -- Pigment Yellow 191; 4-Chloro-2-[5-hydroxy-3-methyl-1-(3-sulfophe- nyl)pyrazol-4-ylazo]-5-methylbenzene sulfonic acid, calcium salt

CAS RN:129423-54-7

Molecular formula:C₁₇H₁₃CaClN₄O₇S₂

Molecular weight:524.97

Physical property data

Hue or color tone: red light yellow

Relative density: 1.6

Bulk density/(lb/gal): 11.7-11.8

Melting point/℃: >400

Average particle size/μm: 0.16

Particle shape: cubic

Specific surface area/(m2/g): 26

pH value/(10% sizing agent): 7

Oil absorption: 40±5 grade

Covering power: semi-transparent

Red light yellow powder, with favorable acid resistance, alkali resistance and heat resistance

Main uses

Its color tone is similar to that of C.I. pigment yellow 83. It has lower color power, but better heat resistance. In high-density polyethylene (HDPE, 1/3 standard depth), heat resistance is 300℃, favorable light fastness (7-8 grade); it has excellent migration resistance in plastic; in polycarbonate, its heat resistance can reach 330℃.

System No.

CAS RN: 129423-54-7

EINECS No.: 403-530-4