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High tinctorial strength with excellent color development in both aqueous and solvent-based systems.
Good lightfastness (ISO 105-B02, Grade 6–7) and weather resistance for outdoor durability.
Outstanding heat stability up to 180 °C, suitable for high-temperature processing including plastics compounding.
Excellent dispersibility in polar media, enabling low-energy pigment grinding and stable colorant formulations.
Low volatile organic compound (VOC) content, supporting compliance with stringent environmental and safety regulations.
Automotive coatings (basecoat and clearcoat systems requiring high chroma and gloss retention).
Industrial coil coatings for architectural and appliance metal substrates.
Engineering thermoplastics including ABS, PS, and polyolefins for interior and exterior components.
High-performance inks for flexible packaging and gravure printing applications.
PVC compounds for window profiles, flooring, and cable sheathing where thermal and migration resistance are critical.
| Chemical Type | Lithol Red derivative (Calcium salt of 3-hydroxy-4-(2-methyl-5-nitrophenylazo)-2-naphthoic acid) |
| Product Form | Free-flowing powder |
| Appearance | Reddish-brown to maroon fine powder |
| Primary Applications | Coatings, plastics, inks |
| Key Features | Heat stability, lightfastness, dispersibility, low migration |
| Benefits | Consistent batch-to-batch color, reduced formulation complexity, extended service life |
| Regulatory Status | REACH registered; compliant with EU Directive 2002/61/EC for azo pigments |
| Storage Conditions | Store in cool, dry place below 30 °C; protect from moisture and direct sunlight |
Q1: What is the primary chemical class and typical hue of Lithol K3690?
A: Lithol K3690 is a high-performance monoazo pigment based on the lithol red structural family, delivering a clean, bluish-shade red with excellent chroma and strong tinting strength in both aqueous and organic media.
Q2: Is Lithol K3690 suitable for use in food-contact plastics or inks?
A: Lithol K3690 is not certified for direct food-contact applications. It is intended for general industrial uses including decorative coatings, non-food packaging inks, and engineering plastics where regulatory compliance for migration is not required.
Q3: How does Lithol K3690 perform in terms of heat stability and weather resistance?
A: This pigment offers good thermal stability up to approximately 180–200 °C for short-term processing, making it suitable for standard extrusion and injection molding. Its lightfastness and weather resistance are moderate—recommended for indoor applications or short-term outdoor exposure; extended UV resistance may require supplemental stabilization.
Q4: What dispersion methods are recommended for optimal color development?
A: For best results, pre-disperse Lithol K3690 using high-shear mixing or bead milling in compatible resins or vehicles. Its performance is highly dependent on particle size distribution—agglomerates should be fully broken down to achieve maximum color strength and gloss.
Q5: Can Lithol K3690 be used alongside other organic pigments or in mixed-pigment systems?
A: Yes—it exhibits good compatibility with many common organic pigments and is frequently used in shade adjustment blends. However, compatibility testing is advised when combining with acid-sensitive or strongly alkaline pigments to avoid potential interaction or flocculation.
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E-mail: wangxingqiang@ericwchem.com
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