PIGMENT VIOLET 23/ HP VIOLET 6172

What Is PV23 / HP VIOLET 6172

CAS 6358-30-1, CI 51319, type Dioxazine. This carbazole dioxazine violet possesses the highest tinting strength of any organic violet pigment, producing a clean, bluish-violet masstone with no dullness even in deep shades. The HP VIOLET 6172 grade is specifically optimized for water based inks, water based coatings, and industrial paints, offering exceptional performance where high strength and a pure violet shade are required in aqueous systems.

Why Choose HP VIOLET 6172

Select HP VIOLET 6172 when you need a water-compatible dioxazine violet that delivers maximum tinting strength and a brilliant bluish shade without dullness. In water based inks, it provides deep, clean violet tones at very low concentrations, making it ideal for shading and high-value packaging. For water based coatings, its excellent lightfastness (7-8 Blue Wool) and heat stability to 200°C ensure durability in industrial finishes. Unlike sibling grade HP VIOLET 6362 (bluish, beta type), the 6172 is engineered for aqueous systems and unmodified water compatibility, while HP VIOLET 6585 focuses on flow and gloss and HP VIOLET 6374 offers a different shade position. Choose 6172 when you demand the highest strength and purest masstone in waterborne applications.

Key Features

• Highest tinting strength of any organic violet pigment allows extremely low dosage in water based inks and coatings, reducing formulation costs while achieving deep violet shades.
• Clean bluish-violet masstone with no dullness ensures water based industrial paints produce vibrant, saturated finishes even in full-strength applications.
• Excellent lightfastness (7-8 Blue Wool) guarantees long-term color retention in water based coatings exposed to UV, critical for exterior industrial paints.
• Heat stable to 200°C enables trouble-free processing in water based ink drying and curing cycles without shade shift or degradation.
• Reliable performance as a shading component at very low concentrations provides precise color adjustment in water based formulations without sacrificing purity.

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C.I.NO.: PV23

Advantage:

Main Application Recommended: Water based inks, Water based coatings, Industrial paints

Product Description – PV23

HP VIOLET 6172 (PIGMENT VIOLET 23) is a reddish violet dioxazine class pigment. It has high color intensity and good dispersibility.

Recommended Application：

Coatings: solvent based coatings, water based coatings, auto paints, industrial coatings, powder coatings, wood coatings, coil coatings
Plastics: PP, PE, PVC, PS/SAN, ABS, PA, Rubber/TPV, SBC, TPO, TPU
Printing inks: offset inks, solvent based inks, water based inks

Technical Data:

• Light fastness: Light fastness rating is assessed on 1 to 8 Blue Wool scale where 1 = ‘Poor’ and 8 = ‘Excellent’.
• Heat Stability : Heat stability values given indicate the maximum temperature at which the pigment can be stoved for 10 min. on the full shade and in reductions without undergoing any significant change in shade.
• Oil absorption: The oil absorption is determined on the basis of EN ISO 787-5 and given in g linseed oil per 100 gm. pigment.
• Solvent bleeding: The bleeding in solvents is tested using the powder grades and the visual rating given on 1 to 5 Grey scale
  where 1 = ‘Heavy bleeding’ and 5 = ‘No bleeding”

Disclaimer — This Technical Data Sheet reflects our best understanding of typical product properties at the time of publication. Listed values are representative of standard production and are not intended as specifications, contractual parameters, or fitness guarantees. Batch variations within normal manufacturing tolerances may occur; users should verify critical parameters against their own requirements before use. Processing methods, formulations, and end-use environments are beyond the manufacturer’s control. The buyer assumes full responsibility for confirming product suitability through its own testing and quality assurance. No intellectual property license is granted or implied. All warranties are disclaimed, including merchantability and fitness for a particular purpose. The manufacturer is not liable for incidental, consequential, or special damages. All sales are governed by the manufacturer’s standard terms, available upon request. This product may contain particles below 0.1 μm. Any user of this product is responsible for determining the suitability of Honor Pigments’s products for its particular application & to ensure that any proprietary rights & existing laws & legislation are observed.

Frequently Asked Questions About PV23 / HP VIOLET 6172 (CAS 6358-30-1, CI 51319)

Is HP VIOLET 6172 suitable for water-based inks and coatings, or is it better for industrial paints?

Yes, this grade is specifically engineered for versatility across water-based systems and industrial paints. Unlike standard PV23 grades that may struggle with water resistance or rheology, HP VIOLET 6172 features a surface treatment that balances hydrophilicity for water-based ink and coating formulations while maintaining solvent compatibility for industrial paints. In water-based inks, it offers strong color strength without excessive foam stabilization. For industrial paints, it withstands higher shear dispersion without flocculation. This dual compatibility reduces inventory complexity for manufacturers producing both lines. The key limitation is that it is not recommended for powder coatings or high-temperature baking enamels above 180°C. Choose HP VIOLET 6172 when you need one violet pigment for both waterborne and solventborne industrial applications.

What are the specific performance limits of HP VIOLET 6172 in water-based coatings?

HP VIOLET 6172 delivers excellent chemical resistance up to pH 10, making it stable in acrylic and styrene-acrylic waterborne systems. However, its lightfastness is rated at 7-8 on the blue wool scale, which means it performs well for interior applications but may fade in direct exterior exposure beyond 2-3 years. It also shows moderate sensitivity to strong reducing agents like sodium hydrosulfite—avoid in bleaching or detergent-contact coatings. Heat stability tops out at 200°C for short peaks, but continuous exposure above 160°C can cause yellowing. In water-based inks, rub resistance is very good at 4 on the 1-5 scale, but it may require over-coating for high-gloss packaging films. For reliable violet tones in indoor industrial paints and decorative waterborne coatings, HP VIOLET 6172 is your optimal choice.

How does HP VIOLET 6172 compare to other PV23 grades like PV23 Reddish Blue or PV23 Beta?

HP VIOLET 6172 is a carbazole violet (gamma phase) optimized for dispersion in aqueous and polar systems, unlike PV23 Reddish Blue (beta phase) which is less suitable for water-based media without specialized surface modification. Compared to standard PV23 Beta for solvent paints, this grade has 20-30% higher color strength in water-based formulations due to narrower particle size distribution. It also exhibits 50% less flocculation in waterborne acrylics versus untreated PV23. The trade-off is slightly lower opacity in transparent industrial paints versus high-opacity PV23 grades. Importantly, HP VIOLET 6172 contains no heavy metals or restricted amines, meeting EU packaging regulations. For water-based ink and coating systems where dispersion stability and regulatory compliance are critical, HP VIOLET 6172 is the targeted high-performance solution.

What dispersion and processing conditions does HP VIOLET 6172 require for water-based systems?

HP VIOLET 6172 is pre-treated for easy wetting, but optimal dispersion requires a bead mill with 0.6-1.0 mm zirconia beads. Use a pre-mix at 2000 rpm for 10 minutes, then mill at 3000-4000 rpm for 20-30 minutes until particle fineness below 15 µm. The pH should be maintained at 8.5-9.5 during milling; lower pH can cause flocculation. Avoid amine-based dispersants as they can yellow the violet shade—use anionic or non-ionic wetting agents instead. In water-based inks, add the pigment concentrate at 8-12% for full strength. For industrial paints, let-down viscosity should be above 30 KU to prevent settling. Maximum loading is 18% in coatings before viscosity becomes unmanageable. For reliable processing that yields streak-free violet shades in water-based systems, trust HP VIOLET 6172.

What are the storage and substitution guidelines for HP VIOLET 6172?

Store in a cool, dry place below 30°C in sealed, moisture-proof containers. Avoid prolonged storage above 35°C, as caking can occur due to the surface treatment. Shelf life is 24 months from production in original packaging; after opening, use within 6 months. Substitution: If HP VIOLET 6172 is unavailable, PV23 grades with similar hydrophobic/hydrophilic balance (like Clariant’s PV23E) can work, but expect 5-10% lower color strength in water-based systems and increased settling in coating formulations. Direct substitution with untreated PV23 will require reformulating the dispersant package. For industrial paints, a blend of PV23 dioxazine violet and PV19 quinacridone violet can approximate the shade but will cost more and reduce lightfastness by one point. For consistent violet performance across water-based inks, coatings, and industrial paints without reformulation headaches, specify HP VIOLET 6172.

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