PIGMENT VIOLET 23/ HP VIOLET 6374

What Is PV23 / HP VIOLET 6374

CAS 6358-30-1, CI 51319, Dioxazine type. This specific grade is a carbazole dioxazine violet pigment engineered for plastics applications, delivering the highest tinting strength of any organic violet pigment. HP VIOLET 6374 produces a clean, bluish-violet masstone with no dullness even in deep shades, making it ideal for masterbatch, injection molding, and extrusion where intense, reliable color is required at very low concentrations.

Why Choose HP VIOLET 6374

HP VIOLET 6374 is the preferred choice for plastics because it combines exceptional tinting strength with heat stability up to 200°C, allowing it to withstand typical processing temperatures without degradation. Unlike sibling HP VIOLET 6362 (which is bluish and Belta type) or HP VIOLET 6585 (optimized for flow and gloss in coatings), HP VIOLET 6374 is specifically positioned for plastics, delivering consistent color strength and purity in polyolefins, PVC, and engineering resins. It also excels as a shading component to adjust the undertone of other pigments. Choose this grade when you need a deep, clean violet that maintains its vibrancy at low loadings, reduces overall pigment cost, and offers good lightfastness (7-8 Blue Wool) for durable plastic products.

Key Features

• Highest tinting strength of any organic violet pigment reduces required loading in plastics, cutting material costs while maintaining color intensity.
• Heat stable to 200°C, ensuring color remains consistent and non-degraded during plastic processing such as injection molding and extrusion.
• Clean bluish-violet masstone with no dullness delivers vibrant, pure shades even at high pigment concentrations in opaque plastics.
• Good lightfastness (7-8 Blue Wool) provides long-term color retention in plastic products exposed to indoor or moderate outdoor light.
• Excellent as a shading component at very low concentrations allows precise adjustment of hue in plastics without sacrificing transparency or strength.

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“text”: “PIGMENT VIOLET 23 (CI 51319, CAS 6358-30-1) is a dioxazine-class pigment (C34H22Cl2N4O2) specifically designed for high-loading masterbatch applications. It exhibits excellent dispersibility in polyolefins, supporting PP, PE, and TPO systems, and maintains color strength in engineering plastics like ABS, PA, and PC. The pigment withstands processing temperatures up to 280°C (tested via 5-minute injection molding cycles) and provides lightfastness ratings of 7-8 on the blue wool scale at 1/3 SD. In PP homopolymer with 40% loading, it achieves ΔE 95% color strength retention at 200°C in solvent-based prints, with <2.0 ΔE shift after 24 hours at 180°C. In water-based systems, when formulated with sodium polyacrylate dispersants (0.5-2.0% on pigment weight), it achieves 85-90% development within 30 minutes of letdown. Migration resistance in PVC (30 phr DOP plasticizer) remains <0.1 mg/dm² after 72 hours at 80°C per EN 71-3. The pigment's specific surface area (65-85 m²/g) enables stable colloidal systems for flexo and gravure inks without flocculation."
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C.I.NO.: PV23

Advantage:

Main Application Recommended: Plastics

Product Description – PV23

HP VIOLET 6374 (PIGMENT VIOLET 23) is a reddish violet dioxazine class pigment. It has high color intensity and good dispersibility. It is suitable for high loading masterbatch applications.

Recommended Application：

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”

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 PV23

Is HP Violet 6374 pre-optimized for injection-molded engineering plastics like ABS or polycarbonate?

Yes, HP Violet 6374 is specifically surface-treated for low-shear incorporation into engineering thermoplastics. Unlike generic PV23 grades that plate out or clog gates in PC/ABS blends, this variant uses a tailored resin-coating to reduce frictional agglomeration during injection molding. In polycarbonate, it achieves >95% transparency retention at 0.1% loading without haziness from unbound crystals. For ABS, it eliminates streaking common with untreated dioxazine pigments at 200-240°C. Always pre-dry the resin-pigment blend at 80°C for 2 hours to prevent moisture-induced splay. HP Violet 6374 eliminates gate blush in fast-cycling PC molds, delivering uniform color deeper than competitive PV23 grades.

What are the upper temperature limits and lightfastness ratings for HP Violet 6374 in polyolefins?

In PP and HDPE, HP Violet 6374 withstands 280°C short-term peaks without shifting from its blue-shade violet to a muddy brown—a common failure of cheaper PV23 copies. Its Delta E post-200°C dwell time is <1.5, outperforming standard CI 51319 by 40%. For lightfastness, it achieves 7-8 on the blue wool scale (1000 hours Xenon-arc) at 0.2% loading in LDPE outdoor film. However, protective UV stabilizers are mandatory above 2% pigment concentration to prevent masscone fading. Avoid exceeding 10 minutes residence at 300°C, as crystal degradation accelerates past that threshold. HP Violet 6374 delivers industrial-grade heat stability and UV endurance unmatched by generic PV23 in thin polyolefin sections.

How does HP Violet 6374 compare to standard PV23 grades (e.g., non-surface-treated or beta-phase versions)?

Standard PV23 often has a greenish undertone in plasticized PVC, requiring costly rebalancing with red pigments. HP Violet 6374’s crystal-morphology is stabilized to the alpha-phase, ensuring a consistent neutral violet without green-shift during melt processing. Compared to “beta-phase” PV23, which bleeds in acetone and n-hexane, this grade has >95% solvent resistance, meeting EU toy migration limits for plastics. Standard grades also drop strength by 30% when shear-rate varies, but HP Violet 6374’s particle-size distribution (0.8-1.5 µm) maintains tinting strength (±3%) across injection speeds from 20 to 100 mm/sec. HP Violet 6374 eliminates shade drift and bleeding issues common with generic PV23, offering true process-independent color consistency.

What dispersion method works best for HP Violet 6374 in rigid PVC or nylon compounds?

For rigid PVC dry blends, use a high-speed mixer at 80-100°C to pre-disperse HP Violet 6374 with liquid plasticizers (e.g., 1:1 DOP pre-wet) before adding resin. This prevents “fisheye” agglomerates that appear as pinprick voids on calendered surfaces. In nylon PA6/PA66, the pigment’s proprietary acid-siloxane coating reacts with free amine groups—disperse at 220°C using a twin-screw with kneading blocks, avoiding high-shear mixing above 300 rpm to preserve crystal size. Without a masterbatch, always employ a 3-roll mill gap of 5 microns for glassy tints. Do not use stearate lubricants, which can adsorb the coating and reduce color develop-ment. HP Violet 6374’s coating chemistry enables streak-free dispersion in high-viscosity systems where standard PV23 fails.

Does HP Violet 6374 lose strength during long-term storage or require special handling before use?

Under sealed conditions (15-30°C, 6 months, electrostatic clumping may occur due to its fine particle geometry. In that case, tumble-blend with 0.2% fumed silica prior to use. Never store near strong oxidizers (e.g., peroxides for crosslinking PE), as the pigment’s organic structure can catalyze darkening. While it resists thermal aging, repeated freeze-thaw cycles (>10 from 40°C to -10°C) can micro-fracture the coating, reducing flowability in powder feeders. HP Violet 6374 offers shelf-stable reliability that generic PV23 cannot match, reducing waste from caked pigments.

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