Lithol Red|Pigment Red 49:1|CAS 1103-38-4

Lithol Scarlet

Chinese alias: Pigment Red 49:1, Lithol Scarlet 105, 1301 Lithol Scarlet, Barium 2-(2-hydroxy-1-naphthylazo)-1-naphthalenesulfonate
English name: Pigment Red 49:1
Molecular formula: C40H26BaN4O8S2
Molecular weight: 892.1134
CAS Registry Number: 1103-38-4
EINECS Registry Number: 214-160-6

Physical and Chemical Properties
Classification: Azo lake organic pigment
Hue: Neutral red with yellowish red
Relative density: 1.48-1.90
Bulk density/(lb/gal): 12.3-15.8
Average particle size/μm: 0.1
Particle shape: Rod-shaped
Specific surface area/(m²/g): 32-67
Solubility: Slightly soluble in ethanol and hot water
Oil absorption/(g/100g): 40-50
pH value/(10% slurry): 7-8
Opacity: Translucent type

Product properties:
Red powder with strong tinting strength but poor hiding power.
Lightfastness: Grade 5
Heat resistance: 150°C
Water resistance: Grade 4
Oil resistance: Grade 4
Acid resistance: Grade 4
Alkali resistance: Grade 4

Product application:
Usage: Mainly used as a coloring pigment for inks and watercolors, oil paints in stationery products, and can also be used in coatings.
This pigment variety is a barium salt lake, providing a neutral red light. Due to its less ideal heat stability, its application in plastics is limited; it is mainly used for ink coloring, especially for publication gravure inks. Resin-treated formulations can reduce its bronzing phenomenon; specialized formulations are suitable for aqueous inks.