Natural color：

Dilute color：

Pigment red is a kind of dyestuff and pigment, molecular formula is C₂₇H₂₄N₆O₆S, molecular weight is 560.5811.

Chemical formula:

                

Basic information  

Product name:pigment red 185

Alias:2-Naphthalenecarboxamide, N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-hydroxy-4-((2-methoxy-5-methyl-4-((methylamino)sulfonyl)phenyl)azo)-; 2-Naphthalenecarboxamide, N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-hydroxy-4-(2-(2-methoxy-5-methyl-4-((methylamino)sulfonyl)phenyl)diazenyl)-; 

CAS RN:51920-12-8

Molecular formula:C₂₇H₂₄N₆O₆S

Molecular weight:560.5811

Physical property data  

Hue or color tone: bright blue light red
Relative density/(g/cm3): 1.45
Bulk density/(lb/gal): 11.2-11.6
Average particle size/μm: 180
Particle shape: small flake
Specific surface area/(m2/g): 45;43-47
PH value/(10% sizing agent): 6.5
Oil absorption/(g/100g): 97
Covering power: transparent

Main uses  

Metric hue angle is 358.0° (1/3SD, HDPE), poorly soluble in common organic solvents. Heat resistance in printing ink is 220℃/10min, it is suitable for metal decoration and laminated plastic, light fastness is 6-7 grade (1/1SD); in plastic tinting, light fastness is 6-7 grade (1/3SD), in PE tinting, heat resistance <200℃.

System No.  

CAS RN: 51920-12-8

EINECS No.: 257-515-0