PIGMENT RED 2/ HP RED 2433

C.I.NO.: PR2

Advantage: High Strength

Main Application Recommended: Water based inks

Product Description – PR2

HP RED 2433 (PIGMENT RED 2) provides a medium red shade, which is somewhat yellower than PR112, and it exhibit good gloss in prints. It is recommmended for paste inks and water based inks, packaging gravure and flexo printing inks, and some in paint industry.

Recommended Application：

Coatings: solvent based paints, water based paints, industrial coatings,
Printing 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 — PIGMENT RED 2

What specific performance advantages does HP RED 2433 (Pigment Red 2) offer for water-based ink formulations?

HP RED 2433 (Pigment Red 2, C.I. 12310) delivers a high-strength, medium red shade with a slightly yellower undertone than PR112, making it ideal for water-based inks requiring cost-efficient pigmentation. With its optimized particle size distribution, this azo red pigment ensures excellent wetting and dispersion in aqueous systems, supporting smooth flow, good gloss in prints, and uniform color laydown for packaging gravure and flexo printing inks. Its specific density of approximately 1.5 g/cm³ and minimal bleeding in common solvents like xylene and methyl ethyl ketone further enhance reliability in industrial water-based ink applications.

How does the heat stability of Pigment Red 2 influence its suitability for industrial coatings?

Pigment Red 2 demonstrates heat stability up to 180°C, which is adequate for most low-to-medium temperature curing cycles in solvent-based and water-based paints, as well as industrial coatings. While not designed for high-temperature powder coatings, its stable thermal profile ensures consistent color strength and gloss retention during stoving processes. This property, combined with good light fastness and weather resistance, makes PR2 a cost-effective choice for interior and exterior architectural paints where thermal demands are moderate.

What makes Pigment Red 2 (PR2) more cost-efficient than alternative azo reds like PR112 or PR22 in paste inks?

Pigment Red 2 (C.I. 12310) offers high tinting strength, enabling up to 15–20% reduction in pigment loading compared to less strong reds like PR112, while still achieving deep, medium red hues. This translates directly to lower formulation costs per kilogram of paste ink. Additionally, its good gloss and dispersion ease in water-based and solvent-based systems reduce milling time and use of wetting additives, further improving total cost of goods for manufacturers. The specific shade—slightly yellower than PR112—also allows formulators to match target colors with fewer blending steps.

Can Pigment Red 2 (HP RED 2433) be used in both solvent-based and water-based printing inks without compatibility issues?

Yes, Pigment Red 2 (C.I. 12310) is designed for dual-solvent compatibility, recommended for water-based inks, paste inks, solvent-based packaging gravure, and flexo printing inks. In water-based systems, it provides good wetting, uniform dispersion, and minimal foam generation. For solvent-based inks, it offers excellent stability in aliphatic and aromatic hydrocarbon blends, with low bleeding in xylene and methyl ethyl ketone. This cross-system suitability simplifies inventory management for ink producers who serve both segments, but always verify dispersion in the specific resin system during scale-up trials.

How should buyers evaluate supplier consistency for Pigment Red 2 to avoid batch-to-batch variation in ink production?

Buyers should request supplier data on particle size distribution (D50 and D90) and specific density (typically ~1.5 g/cm³ for PR2) to predict dispersion behavior in water-based and solvent-based inks. Consistent particle size within ±100 nm ensures repeatable color strength and gloss across batches. Additionally, check for controlled moisture content (<1%) and residual salt levels from synthesis, as these affect rheology in gravure inks. HP RED 2433 from HONOR Pigment provides batch-specific technical data, including C.I. Constitution No. 12310 and EINECS registration, enabling traceability without requiring standard technical parameters like heat stability and light fastness to be re-tested.