PIGMENT RED 48:1/ HP RED 23132

What Is PR48:1 / HP RED 23132

CAS 5280-66-0, CI 15865, Type: Organic Pigment. PR48:1 is a high-performance naphthol AS organic pigment known for its brilliant red shade. This grade is specifically designed for plastics applications, offering strong color strength and good heat stability. It provides reliable performance in various polymer systems, ensuring consistent and vibrant red hues in finished plastic products. As a barium salt pigment with two acidic functional groups, it offers balanced performance between economy and durability.

Why Choose HP RED 23132

HP RED 23132 is engineered specifically for plastics applications, delivering superior dispersion and color development in polyolefins, PVC, and engineering resins. Its advantage lies in its excellent heat resistance up to 260°C, making it suitable for high-temperature processing without significant color shift or strength loss. This grade offers outstanding lightfastness and weather resistance for demanding outdoor plastic products. Compared to sibling grades, HP RED 23132 provides a cleaner, brighter red shade with higher chroma, while maintaining excellent migration resistance. It is the optimal choice when high color intensity and processing stability are required in plastic masterbatch and compounding. The pigment also demonstrates good chemical resistance, ensuring long-lasting color performance in plastic applications.

Key Features

• Excellent heat stability up to 260°C for high-temperature plastic processing.
• Superior dispersion in polyolefins, PVC, and engineering plastics.
• High color strength and bright red shade with strong chroma.
• Outstanding lightfastness and weather resistance for outdoor applications.
• Excellent migration resistance and good chemical stability in plastic matrices.

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C.I.NO.: PR48:1

Advantage:

Main Application Recommended: Plastics

Product Description – PR48:1

HP RED 23132 (PIGMENT RED 48:1) offers medium tinctorial strength, plus good migration fastness in plasticized PVC, blooming stability and nearly complete bleed resistance, and is ideal for LDPE. Its 1/3 SD formulations in PE also endure 200–240°C for 5 minutes, providing heat stability.

Recommended Application：

Plastics: PE, PVC, PC, Rubber/TPV

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 PR48:1 / HP Red 23132

What specific plastic applications is HP Red 23132 best suited for?

PR48:1, offered as HP Red 23132, is a high-performance red pigment engineered for demanding plastics. Its primary fit is in polyolefins like polyethylene (PE) and polypropylene (PP), where it delivers vibrant, opaque reds. It also performs excellently in engineering resins such as ABS and polystyrene (PS), providing consistent color strength and heat stability. For flexible and rigid PVC, this pigment exhibits good dispersion and migration resistance. It is commonly used in masterbatches for consumer goods, automotive interior parts, toys, and industrial packaging where a strong, clean red shade with reliable economics is required. Always test in your specific resin system to confirm compatibility.

What are the key performance limits of PR48:1 in high-temperature molding?

While HP Red 23132 offers good heat stability for most commodity plastics, it has a performance ceiling around 240-260°C for short-term exposure. Prolonged processing above 280°C or in high-hold-temperature injection molding can cause the pigment to shift shade towards a duller, brownish tone or reduce tinting strength. This is especially critical in polycarbonate (PC) or nylon (PA), which require higher processing temperatures. For applications demanding ultra-high heat resistance (over 280°C), you may need to consider a quinacridone or DPP pigment. For standard polyolefins and styrenics, however, HP Red 23132 provides a robust balance of heat stability and cost-efficiency.

How does HP Red 23132 compare to PR57:1 or other reds in plastics?

Compared to PR57:1 (often used in packaging but with lower heat stability), PR48:1 offers superior thermal resistance, making HP Red 23132 more reliable for injection molding at standard PE/PP temperatures. PR57:1 tends to yellow at high heat and may bleed, while PR48:1 remains more stable. Against PR254 (DPP red), PR48:1 is more economical and provides a bluer, slightly magenta-er undertone versus the cleaner, orange-red of PR254. However, PR254 has much higher heat resistance and lightfastness. For coloring general-purpose plastics where cost pressures exist and processing temperatures are moderate, HP Red 23132 is the workhorse choice—bridging the gap between budget organic reds and premium high-heat pigments.

What are the critical processing considerations for using PR48:1 in masterbatch?

Dispersion is the primary processing challenge for PR48:1. Because it is a small-particle organic pigment, it requires high shear during compounding to break down agglomerates and develop maximum color strength. For HP Red 23132, use a twin-screw extruder with optimized screw design or a two-roll mill for fine dispersion. Avoid over-lubricating the system, as excessive waxes can interfere with surface wetting. Drying is not typically required, but the resin base must be moisture-free. For injection molding, ensure adequate back pressure and melt temperature within the pigment’s stable window (typically 180°C-240°C). A well-dispersed masterbatch will prevent specks and ensure consistent color from batch to batch.

Can PR48:1 be substituted for other CI Pigment Reds, and how should it be stored?

Substitution of PR48:1 (HP Red 23132) for pigments like PR53:1 or PR38 is often possible in polyolefins, but always requires full color matching and heat-stability verification, as strengths and undertones vary. It is NOT a direct UV-resistant replacement for quinacridone reds. For storage, PR48:1 is hygroscopic when in powder form. Keep it in a sealed, dry area below 40°C away from direct sunlight and moisture. If stored properly in the original container, shelf life exceeds 5 years. For plastic coloration, **HP Red 23132 delivers reliable, cost-effective red performance across commodity and engineering plastics**—just respect its thermal limits, ensure good dispersion, and verify compatibility with your resin for best results.

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