Pigment Orange 5

Chinese alias: Permanent Orange RN
English name: Pigment Orange 5
Molecular formula: C16H10N4O5
Molecular weight: 338.27
CAS registry number: 3468-63-1
EINECS registry number: 222-429-4
Physical and chemical properties
Classification: Monoazo pigment
Appearance: Orange powder
Hue: Bright reddish-orange
Melting point °C: 302
Relative density/(g/cm3): 1.48-2.00
Specific gravity: 1.5
Oil absorption/(g/100g): 35
Bulk density/(lb/gal): 12.2-16.0
Melting point/°C: 302-318
Average particle size/μm: 0.32-0.37
Particle shape: Rod-shaped
Specific surface area/(m2/g): 10-12
pH value/(10% slurry): 3.5-7.0
Oil absorption/(g/100g): 35
pH value/(10% slurry): 5-6
Covering power: Translucent type
Product properties:
Lightfastness 6 (reaches grade 8 in rigid PVC, grade 7 in coating printing paste)
Heat resistance: 150°C
Migration resistance: Grade 5 (highest grade), indicating no migration phenomenon, suitable for applications requiring high migration resistance such as soft PVC and rubber products
Acid resistance: 4
Alkali resistance: 4
Water resistance: 5, suitable for aqueous inks, printing pastes, and other humid environments
Oil resistance: 5
Product applications
1. Inks
Water-based ink: Suitable for aqueous inks, with water resistance up to grade 5, meeting environmentally friendly printing requirements.
Solvent ink: Performs stably in offset inks and packaging printing inks, with bright color and excellent lightfastness (lightfastness grade 6-7).
Offset ink: Compatible with 52 commercial formulations, with some large particle size products (such as Irgalite Red 2GW) offering better covering power.
2. Coatings and printing
Paint/air-dry paint: Excellent weather resistance, suitable for air-dry paints and industrial coatings.
Printing paste: Lightfastness grade 7, widely used in textile printing.
3. Other fields
Stationery supplies: Such as watercolors, oil paints, and pencil coloring.
Paper coloring: Translucent properties suitable for special paper processing.
Usage: Mainly used in coatings, coating printing pastes, inks, oil paints, and pencils.