PIGMENT RED 122/ HP RED 2574

What Is Pigment Red 122 / HP RED 2574

Pigment Red 122, marketed as HP RED 2574, is a high-performance quinacridone pigment crystallized in the gamma crystal form (CAS 980-26-7, CI Number 73915). Its molecular backbone (C22H16N2O2) delivers exceptional lightfastness, rated at Blue Wool 8, and superior weather resistance, making it indispensable for automotive OEM and industrial coating systems. As a gamma-phase quinacridone, it offers a unique balance of chemical inertness and thermal stability exceeding 200°C. This specific grade is engineered for solvent-based inks and industrial coatings, providing a vivid bluish-red shade without sacrificing migration resistance or durability under harsh exposure.

Why Choose HP RED 2574

This grade’s defining characteristic is its bluish-red hue, which delivers high color purity and brightness in solvent-based ink systems and industrial coatings. Unlike HP RED 26120, which is formulated for a yellowish shade and high transparency for solvent- and water-based ink systems, HP RED 2574 prioritizes opaque, vivid bluish tones with robust hiding power. For plastics applications, HP RED 23126 is the better choice, optimized for polymer compatibility and dispersion at high processing temperatures. If you are formulating inkjet inks requiring extremely fine particles and extreme brightness, HP RED 2574J serves that niche. A formulator should choose HP RED 2574 when the application demands a clean, bluish-red with excellent fastness in solvent-borne formulations—where durability is critical but the color must be unmistakably bright, not subdued by transparency.

Key Features

• The bluish undertone provides a distinct, clean red mass tone that is difficult to achieve with other organic red pigments, enhancing color space coverage in solvent-based ink formulations.
• Its gamma crystal structure ensures thermal and photochemical stability, preventing color shift or fading in industrial coatings exposed to prolonged UV radiation and temperatures above 200°C.
• Inherent insolubility in organic solvents and binder systems guarantees no bleeding or staining in multi-layer coating applications or overprinted ink sequences.
• Particle geometry is designed to maximize hiding power while maintaining high gloss, critical for achieving thin-film opacity in coil and industrial coating lines.
• Excellent wetting characteristics in polar solvent systems reduce the need for aggressive dispersant chemistry, allowing for higher pigment loading without viscosity build.

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“text”: “The bluish shade of PR122 (CI 73915, Quinacridone) delivers a clean, sophisticated magenta-red with high chroma and saturation. This is critical for premium packaging and automotive OEM coatings, where color purity directly impacts brand perception. In solvent-based inks, the fine particle size enables high gloss and depth, while in UV inks it expands the color gamut. The high lightfastness rating ensures shade stability under UV exposure.”
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“text”: “PR122 (CAS 980-26-7) provides high color strength and gloss in solvent-based inks with minimal bleeding in Xylene and MEK. In industrial coatings it offers heat stability and weather resistance for exterior use. The fine particle size supports UV system compatibility without interfering with photoinitiator activity.”
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“@type”: “Question”,
“name”: “Is PR122 suitable for outdoor and long-life applications compared to azo reds?”,
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“text”: “Yes, as a quinacridone, PR122 offers superior lightfastness (7-8 blue wool scale) and weather resistance vs. naphthol-based reds like PR112. It maintains shade and strength in exterior coatings and supports processing up to 250°C. Higher cost is justified by lifecycle value.”
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“text”: “Confirm transparency level and particle size for UV offset and flexo use. Keep concentration under 5-10% for thick films to ensure UV penetration. Check MEK and Xylene bleed data for intercoat adhesion. For food packaging, verify migration compliance.”
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C.I.NO.: PR122

Advantage: Bluish

Main Application Recommended: Solvent based inks, Industrial coatings

Product Description – PR122

HP Red 2574 (PIGMENT RED 122) has bright color and excellent fastness. Transparancy type and fine partile size, mainly used in printing inks in solvent based inks, Uv inks, and industrial coatings, UV coatings.

Recommended Application：

Coatings: solvent based coatings, water based coatings, industrial coatings, powder coatings

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 Pigment Red 122

Which ink systems does HP RED 2574 work best in?

HP RED 2574, with its bluish quinacridone chemistry (CAS 980-26-7, CI 73915), is optimized for solvent-based ink systems and industrial coatings. It delivers high color strength and transparency in gravure and flexographic solvent inks. Unlike sibling grades aimed at plastics (23126) or inkjet (2574J), this grade is formulated to resist crystallization during solvent evaporation. For best performance, use in nitrocellulose, polyamide, or acrylic resin systems. Avoid highly alkaline or aqueous systems, where its bluish shade may shift. The specific takeaway: HP RED 2574 excels in solvent-based packaging inks and industrial paints, not in waterborne or plastic masterbatch applications.

Can HP RED 2574 meet automotive exterior durability requirements?

While PR122 (CAS 980-26-7) is inherently lightfast, HP RED 2574 is not recommended for automotive exterior coatings. Its high transparency and bluer shade make it suitable for interior automotive trims and industrial coatings on machinery or appliances, but it lacks the UV stabilizer packages found in exterior-grade quinacridones. Sibling grade 26120 offers better durability for outdoor use due to its more yellow, opaque crystal form. For automotive exteriors, we suggest testing HP RED 2574 only in basecoat layers with robust clear coats. The takeaway: HP RED 2574 is best for interior or non-automotive industrial coatings requiring a clean, bluish red.

Why does HP RED 2574 appear bluer than other PR122 grades?

HP RED 2574 uses a distinct crystal phase control (CAS 980-26-7) that shifts the CI 73915 chromophore toward the blue end of the spectrum. Unlike the yellowish, more transparent sibling 26120 or the plastics-grade 23126 (optimized for polymer dispersion), 2574 is treated to minimize yellow residual in solvent systems. This specific surface treatment also enhances solubility in ester and ketone solvents, preserving a cleaner, purer bluish red in dry films. The takeaway: HP RED 2574’s bluer shade is intentional—designed for applications needing a cool, deep red without warm undertones.

Can HP RED 2574 be combined with titanium dioxide without losing color strength?

Yes, but carefully. HP RED 2574 (CAS 980-26-7, CI 73915) is a transparent, bluish pigment. When blended with titanium dioxide (TiO₂) for pastel tints, the color strength drops noticeably because TiO₂ scatters light and dilutes the pigment’s saturation. Unlike the more opaque 26120 grade, HP RED 2574 requires higher loading (15–25% pigment by weight of total binder) to maintain a strong tint. For opaque industrial coatings, pre-disperse the TiO₂ separately to avoid flocculation, then let down with the 2574 dispersion. The takeaway: HP RED 2574 is better for deep, transparent shades; for pastels, consider using it at double the concentration of a traditional opaque red.

What dispersion conditions are recommended for HP RED 2574 in solvent-based inks?

For HP RED 2574, use a bead mill with 1.0–1.5 mm glass or zirconia beads at a 1:4 pigment-to-bead weight ratio. Pre-wet the pigment (CAS 980-26-7) in a solvent/resin blend containing 10–15% resin on pigment weight. Mill at 25–30°C for 30–45 minutes until particle size reaches 5–10 microns. Avoid over-milling, as the bluish quinacridone (CI 73915) can re-agglomerate. Sibling grade 23126, for plastics, requires different wetting agents. For 2574, use high-solvating resin like nitrocellulose. The takeaway: HP RED 2574 disperses cleanly in moderate shear—no high-temperature or acidic conditions needed—ensuring the blueness stays intact.

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