PIGMENT RED 53:1/ HP RED 23241

What Is PR53:1 / HP RED 23241

CAS 5160-02-1, CI 15585:1, Monoazo Lake (barium salt). This specific grade is a high-performance variant of PR53:1, engineered for plastics applications where strong tinctorial strength and heat stability up to 160°C are required. It offers a yellower, brighter red shade than PR57:1 and is designed to maintain color consistency during injection molding and extrusion processes, making it a reliable choice for commodity and engineering resin systems.

Why Choose HP RED 23241

Choose HP RED 23241 for plastics when you need a cost-effective, high-strength red that withstands typical processing temperatures without degrading. Unlike its sibling HP RED 2466 (optimized for gloss) and HP RED 2537 (optimized for good viscosity), this grade is specifically positioned for balanced performance in thermoplastics, offering excellent dispersibility and color development in polyolefins, PVC, and polystyrene. Its higher tinctorial strength than many BONA lakes means you can achieve deep, vibrant shades at lower loadings, reducing overall formulation cost. Pick this grade when your application prioritizes reliable heat stability, consistent batch-to-batch color, and the slight yellowness of a barium lake over the bluer tones of other reds. It is the practical workhorse for plastics where extreme lightfastness or chemical resistance is not critical.

Key Features

• Heat stable up to 160°C, ensuring color integrity during typical plastic melt processing without premature decomposition or shade shift.
• Higher tinctorial strength than many BONA lakes, allowing lower pigment loadings in plastics for cost savings while maintaining vibrant color.
• Yellower and brighter shade compared to PR57:1, providing a distinct color space for formulating specific red hues in plastic articles.
• Good dispersibility in polyolefin and PVC systems, minimizing agglomerates and promoting uniform color distribution even at moderate shear mixing.
• Barium salt chemistry delivers consistent performance in commodity plastics where excellent value-in-use and processing reliability are required over extreme fastness properties.

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“text”: “Yes, PIGMENT RED 53:1 (CAS: not applicable, C.I. PR53:1) is primarily recommended for plastics, including PP, PE, PVC, PS/SAN, ABS, PC, PMMA, and rubber/TPV. Its excellent heat stability and color strength make it an economical choice for masterbatch. The low barium content meets strict regulatory requirements for food packaging and toys.”
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“name”: “What are the key performance data for PIGMENT RED 53:1 in PVC?”,
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“text”: “For PVC, PIGMENT RED 53:1 (CI: 15585:1) demonstrates good migration resistance, heat stability up to 280°C, and light fastness suitable for interior use. Specific density is approximately 1.6 g/cm³. It shows excellent acid resistance but limited alkali resistance.”
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“name”: “How does the low barium content of PIGMENT RED 53:1 benefit ink formulations?”,
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“text”: “PIGMENT RED 53:1 (HP RED 23241) is specially treated for low barium content, reducing barium leaching risk. This meets EU REACH and FDA guidelines for food-contact applications while maintaining high color strength and economic cost for PP/PE masterbatch and solvent-based inks.”
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“text”: “PIGMENT RED 53:1 (PR53:1) can be a more cost-effective alternative to PR57:1 in polyolefins where higher heat stability (280°C vs 260°C) is needed. It offers a yellower shade, suitable for orange-red formulations where UV stability is not critical.”
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C.I.NO.: PR53:1

Advantage:

Main Application Recommended: Plastics

Product Description – PR53:1

HP RED 23241 (PIGMENT RED 53:1) is yellow shade red pigment with excellent heat stability and color strength, it is treated with low barium content. it is mainly large used in plastic industry economical. and sometimes used in special inks with requirments on less Barium content.

Recommended Application：

Plastics: PP, PE, PVC, PS/SAN, ABS, PC, PMMA, Rubber/TPV, SBC, TPO, TPU

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 PR53:1

Is PR53:1 (HP RED 23241) suitable for all common plastic resins?

PR53:1 excels in rigid PVC, polyolefins (LDPE, HDPE, PP), and general-purpose polystyrene, offering vivid red shades with strong opacity. However, it shows limited stability in engineering plastics like polycarbonate or nylon due to high processing temperatures. It also performs poorly in plasticized PVC, where plasticizer migration can cause streaking or bleed. Always test in your specific resin system; we recommend an initial loading of 0.3–0.8% for optimal color strength. HP RED 23241 takeaway: This pigment is top-tier for commodity thermoplastics but avoid it for high-heat or heavily plasticized applications.

What are the key performance limits for heat and light stability in PR53:1?

This pigment withstands processing up to 240°C for short durations, but prolonged exposure above 260°C causes noticeable decomposition and shade shift. Lightfastness is rated 4–5 on the blue wool scale for interior applications, but it fades significantly under direct outdoor UV—making it unsuitable for exterior uses. It also suffers in presence of strong acids or alkalis. For safety margins, always keep residence time short. HP RED 23241 takeaway: Reliable for indoor products with moderate heat exposure, but never spec it for outdoor or long-term high-temperature molding runs.

How does PR53:1 compare to the older PR53 or PR48:2 for plastics?

Versus standard PR53 (CI 15585), PR53:1 offers improved heat resistance (20°C higher) and reduced bleed in slow-temperature resins like PE. Compared to PR48:2, it delivers a yellower, more brilliant red versus PR48:2’s bluer shade, but PR48:2 has superior lightfastness and slightly better dispersibility in PVC. PR53:1 also costs less per kilogram than PR48:2, making it a cost-effective choice for vivid reds without extreme stability requirements. Each grade fills a specific niche. HP RED 23241 takeaway: Choose this for brighter, yellow-shade reds in polyolefins at lower cost; switch to PR48:2 only when UV or bleed resistance is critical.

What processing challenges exist for dispersing HP RED 23241 in plastics?

As a classical monoazo pigment (laked), PR53:1 has moderate dispersion behavior—it can form agglomerates if not correctly wetted. Pre-dispersion via masterbatch or two-roll milling is recommended for high-loading applications. Avoid high-shear mixing too early; adding the pigment after resin melt is established prevents dusting and uneven color. For injection molding, a 200-mesh filter screen can help break up any hard particles. No special drying is needed, but moisture exposure may cause surging in extruders. HP RED 23241 takeaway: Use standard dispersion techniques with masterbatch for consistent results; filter screens prevent surface defects.

How should PR53:1 be stored, and can it substitute for other red pigments in a pinch?

Store sealed, away from direct sunlight and humidity—hydrolysis slowly reduces tinctorial strength. Shelf life exceeds 5 years under dry, cool conditions. As a substitute, it can replace standard PR53 (CI 15585) directly with identical shade, but NOT PR57:1 (calcium lithol red) due to different resin compatibilities and bleed resistance. For surprising applications like ABS, it may work at low loadings but expect lower impact strength. Always confirm with a trial before full-scale substitution. HP RED 23241 takeaway: A reliable “drop-in” for PR53 and selected reds only; never assume equivalence without resin-specific testing.

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