PIGMENT VIOLET 23/ HP VIOLET 6585

What Is PV23 / HP VIOLET 6585

CAS 6358-30-1, CI 51319, Type Dioxazine. PV23 / HP VIOLET 6585 is a carbazole dioxazine violet pigment with the highest tinting strength of any organic violet. This specific grade is engineered for solvent-based ink systems, solvent-based coatings, and industrial paints, where it delivers a clean, bluish-violet masstone with no dullness even at deep shades. Its primary application niche is as a high-performance shading component to enhance vibrancy and color depth in solvent-borne formulations.

Why Choose HP VIOLET 6585

Choose HP VIOLET 6585 for solvent-based inks, solvent-based coatings, and industrial paints because it combines excellent flow and high gloss with the purest violet shade in its class. Unlike sibling grades such as HP VIOLET 6362 (bluish, beta type) or HP VIOLET 6374, this grade is specifically optimized to maintain good flow behavior and generate a glossy finish without sacrificing the clean masstone. It differs from HP VIOLET 6172 by offering superior gloss and flow properties. Pick this grade when your solvent-based system requires a strong violet tint that does not introduce dullness, and when you need a pigment that performs consistently at very low concentrations for shading applications. If your formulation demands maximum gloss and smooth application in industrial paints or rotary inks, HP VIOLET 6585 is the optimal choice.

Key Features

• Highest tinting strength of any organic violet pigment ensures minimal dosage achieves deep, intense violet shades in solvent-based inks, reducing raw material costs.
• Excellent flow properties enable smooth, consistent application in solvent-based coatings, preventing streaking and ensuring uniform color distribution.
• High gloss development in solvent-based industrial paints provides a premium, reflective finish that enhances the final product’s aesthetic appeal.
• Heat stable to 200°C, allowing reliable performance in solvent-based systems that undergo moderate thermal processing without color shift or degradation.
• Good lightfastness (7-8 Blue Wool scale) ensures long-term color retention in outdoor industrial paint applications, resisting fading from UV exposure.

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C.I.NO.: PV23

Advantage: Good flow, Good gloss

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

Product Description – PV23

HP VIOLET 6585  (PIGMENT VIOLET 23) is a bluish violet dioxazine class pigment. It has high color intensity and good dispersibility. It exhibitS excellent fastness to light and weather. and fast to most of solvents. it is suitable for solvent based systems.

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 – The information given in this data sheet is based on the present state of our knowledge & is intended as a general description of our products & their possible applications. Due to the multitude of formulations, production & application conditions, all the above mentioned data have to be adjusted to the circumstances of the processor. No liabilities, including those for patent rights, can be derived from this fact for individual cases. It cannot be ruled out that this product contains particles < 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

How does HP VIOLET 6585 perform specifically in solvent-based inks versus solvent-based coatings and industrial paints?

HP VIOLET 6585 excels across all three categories due to its high solubility resistance in common aliphatic and aromatic solvents. In solvent-based inks for gravure or flexography, it provides intense violet shades with excellent transparency and low viscosity build, enabling high pigment loads without clogging. For solvent-based coatings, it delivers strong hiding power and gloss retention when used in clear coats over metallic bases. In industrial paints, its migration resistance and heat stability (up to 200°C) prevent bleed when topcoated with aggressive solvents. The key is that its particle size distribution is optimized for both low-shear mixing and high-speed milling, so you achieve full color strength faster than standard PV23 grades. HP VIOLET 6585 takeaway: This pigment is the most versatile option for solvent-borne systems, balancing fluidity in inks with opacity in paints without requiring formulation compromises.

What are the performance limits of HP VIOLET 6585 regarding lightfastness and chemical resistance?

HP VIOLET 6585 offers very good lightfastness (7-8 on the wool scale) in full shade, making it suitable for outdoor industrial paints that require moderate UV exposure. However, it shows reduced performance in let-down tints (pastel shades), where lightfastness drops to 5-6, meaning it is not recommended for long-exposure architectural applications. Its alkali resistance is excellent, surviving cementitious environments, but its acid resistance is only fair—avoid aggressive mineral acids above pH 2 for extended contact. The pigment withstands common plasticizers, but ketone-heavy solvents like MEK can cause slight surface migration if overbaked. Over-varnish coatings with UV absorbers can extend durability. HP VIOLET 6585 takeaway: It is a robust choice for industrial paints and inks, but avoid pastel tints under direct sunlight and prolonged acid exposure to prevent fading.

How does HP VIOLET 6585 compare to other PV23 grades like Carbazole Violet or its own beta-phase variants?

HP VIOLET 6585 is a specifically processed alpha-phase PV23, not the standard beta-phase often used in plastics. Unlike Carbazole Violet (which is beta-PV23 with a greenish undertone), HP VIOLET 6585 exhibits a redder, bluer mass tone that mimics Dioxazine Violet but with higher solvent stability. Compared to standard PV23 grades for printing inks, HP VIOLET 6585 has a narrower particle size distribution, resulting in 20% higher transparency in overprint varnishes and cleaner shade in metallic coatings. It lacks the coarser crystals found in high-opacity industrial grades, so it offers superior rheology for gravure inks. However, it is more expensive per kilo than bulk beta-PV23. HP VIOLET 6585 takeaway: If your application demands red-shade violet with maximum solvent resistance and press stability, this grade outperforms generic PV23 for solvent-based systems.

What common processing or dispersion issues should I expect with HP VIOLET 6585, and how can I optimize it?

The primary challenge is premature flocculation in low-polarity solvent systems (e.g., toluene-only formulations). This manifests as poor red-shade development and increased viscosity after aging. To optimize, use a wetting agent (e.g., polymeric dispersant at 5-10% of pigment weight) and ensure the solvent blend contains at least 15% ester or ketone (like ethyl acetate) to maintain particle separation. Ball-milling for 2-3 hours at 40°C dissolves internal agglomerates: avoid high-shear beads mills exceeding 3000 rpm, as this can destroy the crystal edges and reduce color strength. For high-solid coatings, pre-disperse in a paste by milling with a resin solution before letdown. Always test the grind on a Hegman gauge—target 7+ for inks. HP VIOLET 6585 takeaway: Treat this pigment as moderately demanding; appropriate dispersant selection and solvent polarity are the critical success factors for full color development.

How should HP VIOLET 6585 be stored, and are there cost-effective substitutes if supply is interrupted?

Store in sealed drums away from moisture (relative humidity below 60%) because the organic pigment can absorb water over time, causing caking in containers—this often requires re-milling before use. Temperature stability is excellent: no degradation up to 50°C for five years. For substitution, direct PV23 alternatives (like Clariant’s Permanent Violet RL) are chemical equivalents, but you must revalidate dispersion to match HP VIOLET 6585’s narrow particle size. A more cost-effective option is a blend of PV19 (Quinacridone Violet) with a small amount of PV23 to emulate the red-shade, though this reduces solvent resistance. Avoid substituting with PV22 (Dioxazine Violet) as it lacks heat stability. HP VIOLET 6585 takeaway: Its reliability in long storage and specialized dispersion make it hard to replace without reformulation; plan for stock buffers and maintain dispersant protocols.

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