PIGMENT RED 48:4/ HP RED 26270

What Is PR48:4 / HP RED 26270

PR48:4 / HP RED 26270 is an organic pigment with no assigned CAS or CI number, classified under the azo pigment type. This specific grade is a high-performance red organic pigment used primarily in industrial coatings. It offers strong color strength and opacity, designed to meet the demanding requirements of solvent-based and waterborne coating systems. The pigment provides excellent dispersion properties, ensuring consistent color development in various resin systems. PR48:4 is known for its reliable performance in exterior and interior industrial applications.

Why Choose HP RED 26270

HP RED 26270 is specifically formulated for industrial coatings, where durability and color retention under harsh conditions are critical. Unlike standard red pigments, this grade delivers superior heat resistance and migration stability, making it ideal for machinery, automotive refinish, and construction equipment coatings. The pigment’s chemical structure provides outstanding resistance to solvents and chemicals commonly encountered in industrial environments. When compared to potential sibling grades (none exist for this product), HP RED 26270 stands out as a standalone solution optimized for high-solid and medium-solid coating formulations. Its ability to maintain chromatic intensity under UV exposure reduces fading over time. For formulators seeking a reliable red pigment that balances cost and performance without compromising on weatherfastness, this grade offers a tailored solution for industrial coating lines where color consistency batch-to-batch is non-negotiable.

Key Features

• Exceptional migration resistance prevents bleeding and blooming in industrial coating systems.
• High heat stability up to 200°C ensures color retention during curing and overbake conditions.
• Excellent chemical resistance withstands exposure to acids, alkalis, and common industrial solvents.
• Superior weatherability provides long-term UV stability for exterior industrial applications.
• Efficient dispersion in both solvent and waterborne systems reduces milling time and energy consumption.

What Is PR48:4 / HP RED 26270

PR48:4, also designated HP RED 26270, is an organic pigment with no assigned CAS or CI registry numbers for this specific variant. As a member of the PR48 family, it is a high-performance azo pigment known for its brilliant red shade. This organic pigment is specifically formulated to deliver superior color strength and stability in demanding industrial environments. Its chemical structure provides excellent resistance to bleeding and migration, making it a reliable choice for professional-grade coatings.

Why Choose HP RED 26270

HP RED 26270 is the preferred grade for industrial coatings due to its exceptional durability and weather resistance. Unlike standard PR48:3 or PR48:2 variants, this grade incorporates advanced surface treatment that enhances dispersion in solvent-based and water-based industrial systems. Industrial coatings require pigments that withstand harsh chemicals, UV exposure, and extreme temperatures; HP RED 26270 excels in all these areas while maintaining a vivid red hue. Its high opacity allows for fewer coats, reducing application time and material costs. When compared to siblings like PR48:1, this grade offers better lightfastness and lower oil absorption, critical for thick-film industrial applications. It is particularly recommended for machinery, structural steel, and heavy equipment paints where long-term color retention is non-negotiable.

Key Features

• Exceptional heat stability up to 200°C ensures color integrity during high-temperature industrial curing processes.
• Superior chemical resistance prevents discoloration when exposed to acids, alkalis, and industrial solvents.
• High tinting strength delivers maximum color yield with lower pigment loading, optimizing formulation costs.
• Excellent outdoor lightfastness (7-8 on blue wool scale) guarantees long-term color retention in exterior industrial coatings.
• Low migration tendency eliminates blooming and bleeding in multilayer industrial paint systems.

C.I.NO.: PR48:4

Advantage:

Main Application Recommended: Industrial coatings

Product Description -PR48:4

HP RED 26270 (PIGMENT RED 48:4) shows red shades that fall on the bluish side of PR 48:3 and the yellowish side of PR 48:2. It exhibits better lightfastness and durability than other PR 48 types. It is recommended for use in industrial paints and sometimes in refinishes.

Recommended Application

Coatings: solvent based coatings, water based coatings, automotive refinishes, industrial coatings, powder coatings
Plastics: PE, PP, PVC, Rubber/TPV, EVA

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.

Here are 5 FAQs for PR48:4 / HP Red 26270 (CAS 5280-66-0, CI 15865:4), focused on industrial coatings.

Frequently Asked Questions About PR48:4

What is the ideal application fit for HP Red 26270 in industrial coatings?

HP Red 26270 (PR48:4) is specifically formulated for high-performance industrial coatings requiring intense, deep red shades with exceptional durability. It excels in applications like heavy-duty equipment, automotive refinish, coil coatings, and general industrial maintenance paints. Its high color strength and excellent opacity allow formulators to achieve vibrant reds at low pigment loads, reducing overall cost. This pigment is particularly effective in solvent-based systems, providing a clean, blue-shade red (mid-shade) that resists haze. For applications demanding a balance between economic efficiency and weather resistance—such as machinery, tractors, and construction vehicles—PR48:4 is a top-tier choice. It is less ideal for high-heat systems over 180°C, where more stable inorganic pigments are required.

What are the key performance limitations of PR48:4 in weather-exposed coatings?

While PR48:4 offers good outdoor durability for an azo pigment, it has defined limits. Its primary limitation is reduced long-term weather resistance compared to high-end quinacridones or perylenes. In severe climates (UV-rich, high humidity), prolonged exposure can cause gradual fade or a slight shift in shade over 3-5 years. It is not recommended for exterior architectural coatings requiring 10-year guarantees, nor for automotive OEM topcoats without an additional clear coat optimized for UV protection. The pigment also shows sensitivity to strong oxidizing agents in chemical environments. However, for most industrial applications—where the product lifecycle is 3-7 years—PR48:4 provides a superior cost-performance ratio. Its lightfastness (7-8 on the Blue Wool scale) is satisfactory for industrial use but not archival. Proper resin selection and UV stabilizers can significantly extend its service life.

How does HP Red 26270 compare to its sister pigment PR48:3 (HP Red 26340)?

The key difference between PR48:4 and PR48:3 lies in their molecular salt structure, which affects shade and heat stability. PR48:4 is a manganese salt, while PR48:3 is a calcium salt. This gives PR48:4 a much bluer, deeper red shade (less yellowish) and higher heat resistance (stable to 250°C versus 200°C for PR48:3). In practice, PR48:4 is preferred for high-speed coil coating lines where the metal reaches 240°C during curing. It also offers lower bleed resistance in some strongly polar solvents compared to PR48:3. Cost-wise, both are similar, but PR48:4 commands a slight premium due to its superior thermal profile. For formulators, switching from PR48:3 to PR48:4 requires shade adjustment because PR48:4 is noticeably bluer. If you need a strong, clean yellow-shade red, stick with PR48:3.

What processing challenges exist when dispersing HP Red 26270 in industrial coatings?

PR48:4 is generally easy to disperse in most industrial resin systems (alkyds, polyesters, acrylics, epoxies), but formulators may face two challenges: grit retention and flocculation. Due to its fine particle size, the pigment can form micro-agglomerates if not processed with sufficient shear energy (high-speed dissolver or bead mill). Always follow the recommended “wetting point” technique: add the pigment slowly to the resin-solvent mixture while mixing to avoid “doughing” (gelling). Over-grinding (beyond 6 Hegman) can damage the crystal structure, causing a duller shade. In low-viscosity systems, flocculation may occur, leading to color shift in the can. Using a compatible dispersant (e.g., a polyester polyamine at 2-4% on pigment weight) improves stability. For best results, pre-disperse the pigment in a paste and let it “sweat” for 12 hours before final letdown.

What is the recommended shelf life and substitution protocol for PR48:4?

HP Red 26270 in powder form has a shelf life of 5+ years if stored tightly sealed in a cool, dry area (< 30°C, < 60% RH). Avoid exposure to high humidity, as the pigment can absorb moisture, causing poor dispersion (lumpy presscake). For presscake forms, storage life drops to 12 months under refrigeration. If you need to substitute PR48:4 due to supply issues, the closest match is CI 15865:1 (PR48:1, barium salt) or mixed metal oxide pigments like CI 10417, but expect a distinctly different shade (greener/browner red). **Do not substitute with PR57:1 (CI 15850:1)** as it will bleed heavily. Always perform a full formulation trial. For a true drop-in replacement, use a high-shear dispersant to match strength. **Takeaway:** HP Red 26270 is your go-to industrial red for heat-stable, cost-effective, blue-shade performance; it balances processibility with commercial practicality better than any sibling in the PR48 family.