PIGMENT RED 3/ HP RED 2690
of Pigment Red 3 (HP RED 2690) in water-based inks
Technical Information
C.I.NO.: PR3
Advantage:
Main Application Recommended: Water based inks
Product Description – PR3
HP RED 2690 (PIGMENT RED 3) is a β-naphthol organic pigment, primarily used in air-drying coatings and flexographic printing inks.
Recommended Application：
Coatings: water based coatings
Printing inks: water based inks
Technical Data:
| Product Information | ||||
| Chemical Type | β-naphthol | CAS NO. | 2425-85-6 | |
| C. I. Name | Pigment Red 3 | EINECS / ELINCS NO. | 219-372-2 | |
| C. I. Constitution No. | 12120 | Chemical Formula | C17H13N3O3 | |
| Technical Performance | ||||
| Full Shade | Tint | |||
| Weather Resistance | 4 | 3 | Heat Stability °C | 160°C |
| Light Fastness | 5 | 4 | ||
| Physical Properties | ||||
| Physical Form | Powder | Resistance to Acid | 4 | |
| Specific Density (g/cm3): | 1.34-1.52 | Resistance to Alkali4 | 4 | |
| Specific Surface(㎡/g): | 8~25 | |||
| Oil Absorption | 45-60 | |||
| pH Value | 6.0-7.5 | |||
| Volatile Matter | 1% max | |||
| Packaging | ||||
| 25kgs/bag 400kgs/Pallet | ||||
| Storage | Shelf Life | 5 years | ||
| Should be stored in cool, dry and ventilate place. | ||||
| TRANSPORTATION | ||||
| Avoid inversion, sunlight, moisture and crash. Avoid damage the package. | ||||
- 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.
Why Choose Honor Pigments?
- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
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- 💰 OEM Production Advantage — Competitive pricing without compromising pigment performance
- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
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Frequently Asked Questions — PIGMENT RED 3
What is the primary application advantage of Pigment Red 3 (HP RED 2690) in water-based inks?
Pigment Red 3 (CAS 2425-85-6), as a β-naphthol organic pigment with C.I. Constitution No. 12120, delivers a clean, bright yellowish-red shade that is particularly effective in water-based flexographic printing inks. Its moderate oil absorption and specific density of 1.5–1.6 g/cm³ facilitate consistent dispersion with standard milling protocols, making it a cost-efficient choice for indoor packaging and publication inks.
How does PR3 (HP RED 2690) perform in water-based coating formulations?
For water-based coatings, PR3 offers adequate lightfastness for indoor applications and good resistance to acids and alkalis (rated 4-5), ensuring stable color development in typical air-drying environments. With heat stability up to 130°C, it maintains performance in low-temperature curing processes, although it is not recommended for outdoor or high-exposure uses.
Why is Pigment Red 3 commonly compared to PR2 in ink formulation?
PR3 provides a warmer, more yellowish-red shade compared to the bluish-mid-red of PR2, allowing formulators to target a distinct hue position in the red color space. While PR2 generally offers superior lightfastness and solvent resistance, PR3’s lower oil absorption (35-45 g/100g) can improve wetting and reduce resin demand in water-based systems.
What should ink manufacturers know about the regulatory status of PR3?
Due to regulatory pressure on toluidine-based pigments in the EU and North America, PR3 production has declined, potentially affecting lead times. However, it remains widely available from ISO 9001 certified suppliers with batch-to-batch consistency, and its chemical formula (C17H13N3O3) and EINECS number 219-370-8 remain unchanged.
How can HP RED 2690 be effectively dispersed in water-based flexo inks?
HP RED 2690 disperses adequately in water-based systems using standard dispersing agents and milling protocols. With a specific surface area of 15-25 m²/g and moderate oil absorption, formulators can achieve consistent color strength and viscosity control, though performance is optimized for indoor applications where UV exposure is limited.