Permanent Red F3RK | Pigment Red 170 | CAS 2786-76-7

Permanent Red F3RK

Chinese alias: Pigment Red 170, Naphthol Red
English name: Pigment Red 170
Molecular formula: C₂₆H₂₂N₄O₄
Molecular weight: 454.48
CAS registry number: 2786-76-7
EINECS registry number: 220-509-3

Physicochemical Properties
Classification: Monoazo pigment
Appearance: Red powder
Hue: Yellowish red
Relative density: 1.25–1.36
Bulk density (lb/gal): 10.4–11.3
Melting point (°C): 315–325
Average particle size (μm): 0.18–0.22
Particle shape: Rod-like
Specific surface area (m²/g): 22–26
pH (10% slurry): 6–7
Oil absorption (g/100g): 45–70
Opacity: Opaque type

Product Properties
Lightfastness: 7
Heat resistance: 220
Migration resistance: 5
Weather resistance: 3
Acid resistance: 5
Alkali resistance: 5
Water resistance: 5
Oil resistance: 5
Opacity slightly better than F5RK
Tinting strength slightly lower than F5RK

Product Application:
Yellowish bright red powder with strong opacity, suitable for high-coverage scenarios.

Applications: Mainly used in: exterior coatings, industrial coatings, inks, plastics
Exterior coatings: Agricultural tools, automotive coatings, equipment manufacturing coatings (good weather resistance, but may darken slightly with long-term use)
Industrial coatings: Powder coatings, air-drying paints (motorcycle, bicycle topcoats)
Inks: Water-based inks, screen printing inks (resistant to grease, saponification, and disinfection treatments)
Suitable plastics: Rigid PVC, rubber; color stable up to 200°C, high opacity