PIGMENT RED 146/ HP RED 2262

What Is PR146 / HP RED 2262

CAS 5280-68-2, CI 12485, Type: Naphthol AS Monoazo. This bluish-shade red pigment is a mid-performance Naphthol AS monoazo offering excellent lightfastness (6 Blue Wool) and solvent resistance. HP RED 2262 is specifically engineered for water-based inks, delivering reliable color strength and stability where cost-effective alternatives like PR57:1 or PR53:1 fall short in durability. It occupies the economic sweet spot between basic monoazo reds and high-cost quinacridones, making it ideal for industrial paints, printing inks, and plastics requiring balanced performance.

Why Choose HP RED 2262

HP RED 2262 is the preferred grade for water-based inks because it maintains vibrant bluish-red hues without compromising on solvent resistance or lightfastness—critical for packaging and print applications exposed to light and moisture. Unlike its sibling grades (HP RED 25107 and HP RED 25107J), which may target solvent-based systems or specific dispersion profiles, HP RED 2262 is formulated to optimize stability and wetting in aqueous formulations. Choose this grade when you need a reliable, economical red that outperforms basic monoazo reds in durability but does not require the premium cost of quinacridones. It is the go-to for mid-range industrial paints, can coatings, and water-based flexo/gravure inks where consistent performance and regulatory compliance matter.

Key Features

• Excellent lightfastness (Blue Wool Scale 6) ensures printed colors resist fading in prolonged UV exposure, critical for outdoor packaging and industrial labels.
• High solvent resistance prevents bleeding or color migration in water-based ink formulations, maintaining print integrity during lamination or overcoating.
• Strong bluish-red shade provides high chroma and depth, enabling vibrant, premium-looking prints without the cost of high-performance pigments like quinacridones.
• Optimized dispersion in water-based systems reduces agglomeration, allowing easy incorporation and consistent color strength batch to batch.
• Economic alternative to PR57:1/PR53:1 with superior durability, making it ideal for mid-range applications where cost and performance must balance.

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C.I.NO.: PR146

Advantage:

Main Application Recommended: Water based inks

Product Description – PR146

HP RED 2262 (PIGMENT RED 146) is bluish red pigment with very good solvent resistance, primarily used in water based printing inks, coatings and paints. It is somewhat yellower than PR57:1, with good perfoamnce in inks. And also very good light fastness in textile printings. is primarily applied in emulsiion and architectural paints as well, and also used in general industrial paints where durability is not important.

Recommended Application：

Coatings: water based paints, industrial paints
Printing inks: offset 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 PR146

Is PR146 specifically designed for water‑based ink systems, and what makes it compatible?

Yes, PR146 (HP RED 2262, CAS 5280-68-2, CI 12485) is optimized for water‑based inks. Its surface treatment and particle size distribution (typically D50 < 0.5 µm) ensure rapid wet‑out in acrylic, styrene‑acrylic, or polyurethane resin systems, without aggressive dispersants. Unlike solvent‑grade pigments that may re‑agglomerate in water, this grade resists hydrolysis and maintains color strength at pH 8–9. It also shows low foaming during letdown, a common issue with untreated organics. For direct gravure, flexo, or screen printing on paper/board, it delivers consistent rheology and press stability. Takeaway: HP RED 2262 is purpose‑engineered for water‑based inks, offering fast dispersion and stable viscosity without surfactant overload.

What are the key performance limits of PR146 in water‑based inks, especially regarding lightfastness and bleeding?

PR146 exhibits excellent solvent bleed resistance (ethanol, glycols) but has a lightfastness rating of only 4–5 (Blue Wool Scale) in full‑strength prints, dropping to 3–4 when reduced with TiO₂. This makes it unsuitable for outdoor signage exceeding 6 months without over‑lamination. It is also sensitive to strong alkaline conditions (pH > 10), where the azo‑lithol structure may undergo slight shade shift to yellower red. Heat resistance is moderate (180°C peak for seconds), limiting use in heat‑seal or curing‑oven applications above 200°C. For interior packaging, labels, and textile printing (where bleeding is controlled by binder crosslinking), it performs reliably. Takeaway: HP RED 2262 delivers good bleed resistance for indoor use, but requires UV protection for prolonged exposure or alkaline‑sensitive formulations.

How does PR146 compare to other PR146 variants or sister grades like PR57:1 or PR53:1 for water‑based inks?

PR146 (HP RED 2262) is a bluish‑red (λmax ≈ 490 nm) with high chroma, distinct from PR57:1’s yellower red (lithol rubine) and PR53:1’s orange‑red. Unlike PR57:1, PR146 does not form crystal‑size issues in water (no “bronzing” on drying). It has higher transparency than PR53:1, making it ideal for overprint or process red. However, PR53:1 offers lower cost and better heat stability. Compared to other PR146 suppliers, our “HP” grade uses a proprietary resin‑coated surface that reduces water‑soluble by‑products (e.g., calcium‑salt bleed) common in generic PR146. For spot‑color reds in water‑based flexo, HP RED 2262 gives cleaner shade and less metameric shift under LED lighting. Takeaway: HP RED 2262 occupies a niche between cost‑driven PR53:1 and stable PR57:1, offering unique transparency and clean blue‑red tone for premium water‑based jobs.

What specific dispersion and processing parameters are critical for PR146 in water‑based ink manufacturing?

Use a 3‑roll mill or high‑speed dissolver (2,000‑3,000 rpm) with pearl or ceramic beads. The optimal resin‑to‑pigment ratio is 1.5:1 to 2:1 for acrylic systems; excess resin may cause flocculation. Avoid over‑milling beyond 45 minutes at 50°C, as PR146’s azo‑lithol structure can produce fines that reduce gloss. The dispersant of choice is an acrylic‑ammonium salt (e.g., 2‑3% on pigment), not sodium‑based types, to prevent hardness sensitivity. Filter through 10‑µm mesh before letdown. For pH adjustment, use ammonia or AMP‑95, never caustic soda above 0.5%. Final ink viscosity should target 30–40 seconds (Zahn #2) at shear rate 1000 s⁻¹. Takeaway: HP RED 2262 requires controlled low‑temperature milling and specific anionic dispersants to maintain its pure shade and high gloss in water‑based inks.

How should PR146 be stored, and can it substitute for other red pigments like Pigment Red 242 or 170 in water‑based inks?

Store PR146 in sealed containers at 15–30°C, away from direct UV. It is hygroscopic: if relative humidity exceeds 70%, dried powder may form lumps that require re‑milling. Shelf life is 3 years (powder) or 1 year (presscake). As a substitute for PR242 (benzimidazolone) or PR170 (naphthol), it offers lower cost but inferior lightfastness and chemical resistance. PR242 is preferred for automotive or high‑durability labels; PR170 is better for alkaline‑resistant soap packaging. HP RED 2262 works best where a bright, low‑cost red with moderate fastness is acceptable—e.g., retail tags, non‑food wraps, or water‑based flexo for corrugated board. Takeaway: HP RED 2262 is an economical replacement for high‑performance reds only when light and alkali demands are low; adhere strictly to dry storage to preserve dispersion quality.

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