PIGMENT VIOLET 19/ HP VIOLET 66108J

What Is PV19 / HP VIOLET 66108J

CAS 1047-16-1, CI 73900, Type Quinacridone. PV19 exists in beta (violet) and gamma (bluish-red) crystal forms, both with Blue Wool 8 lightfastness. This grade, HP VIOLET 66108J, is a high-performance pigment specifically optimized for water-based inkjet inks. It delivers excellent filter properties, ensuring stable color and outstanding light and weather fastness, making it ideal for applications requiring long-term outdoor durability in digital printing.

Why Choose HP VIOLET 66108J

HP VIOLET 66108J is uniquely formulated for water-based inkjet inks because of its exceptional filter properties, which prevent nozzle clogging and ensure consistent ink flow. Unlike its sibling HP VIOLET 66108 (a yellowish, gamma type), this grade provides superior filtration performance, maintaining stable color and excellent light fastness under demanding conditions. Compared to HP VIOLET 6382J, it offers enhanced migration resistance and heat stability above 200°C, critical for inkjet printing durability. Choose this grade when you need a violet quinacridone that combines high-performance color strength with the reliability to produce sharp, fade-resistant prints in water-based systems. It is the preferred option for engineers seeking both vibrant color and long-term outdoor stability in industrial inkjet applications.

Key Features

• Excellent filter properties ensure clog-free performance in water-based inkjet ink systems, enabling consistent print quality over extended production runs.
• Blue Wool 8 lightfastness rating guarantees color stability and resistance to fading, even under prolonged exposure to sunlight in outdoor applications.
• Heat stable above 200°C allows the pigment to withstand the thermal stresses of inkjet printing without degradation, preserving color accuracy.
• Superior migration resistance prevents color bleeding and contamination in multilayer inkjet prints, ensuring sharp image edges and high resolution.
• High-performance quinacridone chemistry delivers vibrant violet tones with weather fastness, making it ideal for durable outdoor signage and packaging.

C.I.NO.: PV19

Advantage: Excellent filter properties, offering stable color and excellent light and weather fastness

Main Application Recommended: Water based inkjet inks

Product description – PV19

HP VIOLET 66108J (PIGMENT VIOLET 19) is a high performance red/violet for the digital ink applications. It has bright yellowish red shade from quinacridone (gamma type) chemistry with excellent filter properties, offering stable color and excellent light and weather fastness. it has good stability in aqueous, solvent based and UV curing inks.

Recommended Application：

Coatings: solvent based coatings, water based coatings, auto paints, industrial coatings, powder coatings, wood coatings, coil coatings
Printing inks: offset inks, solvent based inks, water based inks, inkjet 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”

Technical Note — The data and recommendations provided are based on HONOR Pigment’s internal testing and manufacturing experience. They are offered in good faith to assist customers in evaluating product suitability for their specific applications. As processing conditions, formulations, and end-use requirements vary widely, customers should conduct their own validation under actual use conditions. HONOR Pigment makes no warranties, express or implied, regarding the accuracy of this information or its fitness for any particular purpose. Nothing herein shall be construed as a license or recommendation to infringe any patent. HONOR Pigment’s standard terms and conditions of sale apply.oduct 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 PV19 / HP VIOLET 66108J (CAS 1047-16-1, CI 73900)

Is HP VIOLET 66108J specifically optimized for water-based inkjet formulations, or is it a universal pigment?

This grade is not a universal pigment; it is a surface-treated quinacridone violet engineered specifically for water-based inkjet inks. The proprietary treatment enhances wetting and colloidal stability in aqueous vehicles, preventing flocculation in high-shear jetting environments. Unlike standard PV19 grades, HP VIOLET 66108J exhibits lower hydrolytic reactivity and improved dispersion in water-borne polyurethane or acrylic binders. Its particle size distribution is tightly controlled to avoid nozzle clogging (filter pressure <0.5 bar at 1 µm). For formulators targeting vibrant, bleed-resistant violets for piezo or thermal printheads, this pigment reduces the need for excessive surfactant loading. HP VIOLET 66108J takeaway: A water-inkjet-specific CI 73900 with surface modification for stable jetting.

What are the known performance limits of HP VIOLET 66108J regarding lightfastness and thermal stability?

While PV19 quinacridone inherently offers excellent lightfastness (ISO 105 B02 rating 7-8), HP VIOLET 66108J has a practical upper temperature limit of 200°C for short-term drying. Prolonged exposure above 250°C may cause surface treatment degradation, increasing viscosity drift. Its chroma is optimized for gamut extension but is slightly lower than high-load solvent grades due to water-dispersion constraints. The pigment shows pH sensitivity: maintain ink pH between 7.5-9.0, as acidic conditions can cause color shift toward blue. Outdoor durability is good for inkjet signage but not recommended for automotive or architectural coatings unless overcoated. HP VIOLET 66108J takeaway: Excellent lightfastness, but thermal and pH windows are narrower than generic PV19.

How does HP VIOLET 66108J compare to other PV19 pigment forms like PR 202 or PV 19 beta-phase for inkjet?

HP VIOLET 66108J is specifically the alpha-phase 2,9-dimethylquinacridone (CI 73900), distinct from PR 202 (dichloroquinacridone) or beta-phase PV19. The alpha-phase delivers a pure blue-violet hue (λmax ~560 nm) versus PR 202’s red-violet. Compared to standard PV19 beta, this grade has 40% smaller D50 (0.08-0.12 µm) and a narrower particle size distribution, critical for drop ejection consistency. However, its color strength is approximately 15% lower than high-purity beta PV19 because the surface treatment dilutes chromophore content per volume. For magenta ink expansion, HP VIOLET 66108J enables deeper violet shadings than PR 122. HP VIOLET 66108J takeaway: Unique blue-violet alpha-phase with inkjet-optimized particles versus sibling grades.

What specific milling or dispersion protocol is required to achieve optimal performance with HP VIOLET 66108J?

Pre-dispersion in deionized water with a polymeric hyperdispersant (e.g., anionic acrylic block copolymer at 20-30% agent weight relative to pigment) is mandatory. Use a bead mill with 0.3-0.5 mm yttria-stabilized zirconia beads at a low tip speed (6-8 m/s) to avoid fusing the treatment layer. Milling to 99.9% of particles under 200 nm typically requires 45-90 minutes. Do not use ethanol or volatile organic cosolvents during milling, as they can strip the surface coating. Final dispersion pH should be adjusted to 8.0-8.5 with triethylamine, not inorganic bases. HP VIOLET 66108J takeaway: Requires specific anionic dispersant and low-shear milling; avoid aggressive solvents.

What storage conditions and shelf-life considerations apply if I need to substitute HP VIOLET 66108J for a similar violet pigment?

Store sealed in a cool, dry environment (15-30°C, <60% RH) to prevent moisture absorption that can aggregate the treated particles. Shelf life is 24 months from manufacture in original packaging; after opening, use within 6 months. Direct substitution with standard PV19 (unsurface treated) will fail immediately due to settling and nozzle clogging. For dry-powder substitution, request pre-wetted presscake (50-55% solids) from the supplier. Compatible ink-jet binders include styrene-acrylic emulsions or self-dispersing polyurethanes. Test filterability through 0.5 µm absolute media after 24 hours aging at 60°C to confirm colloidal stability. HP VIOLET 66108J takeaway: Cannot replace generic PV19; requires dry storage and specific aqueous binder compatibility.

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