PIGMENT YELLOW 181/ HP YELLOW 1322

What Is PY181 / HP YELLOW 1322

PY181 / HP YELLOW 1322 is an organic pigment with no assigned CAS or CI number. As a high-performance organic pigment, PY181 belongs to the isoindolinone family and offers superior heat stability and lightfastness. This pigment is specifically engineered for demanding industrial applications where long-term color retention is critical. Its unique molecular structure provides excellent chemical resistance, making it ideal for use in harsh environments where standard organic pigments would degrade. The pigment delivers a bright, green-shade yellow with high tinting strength.

Why Choose HP YELLOW 1322

HP YELLOW 1322 is the preferred choice for plastics processing due to its exceptional thermal stability, allowing it to withstand processing temperatures exceeding 280°C without color shift or decomposition. This grade has been specifically optimized for plastic masterbatch and injection molding applications where consistency and reliability are paramount. The pigment exhibits excellent dispersion characteristics in polyolefins, ABS, and engineering plastics, ensuring uniform color distribution even at low loading levels. Unlike standard yellow organic pigments that may fade or bleed in plastic applications, HP YELLOW 1322 maintains its chromatic intensity throughout the product lifecycle. There are no sibling grades for direct comparison, as this pigment occupies a unique position in the plastics colorant market by combining high heat stability with chemical resistance. For plastic manufacturers requiring a reliable yellow that performs consistently across multiple processing cycles and end-use conditions, HP YELLOW 1322 delivers proven, repeatable results.

Key Features

• Withstands continuous processing temperatures above 280°C without thermal degradation or color shift in plastic compounds.
• Exhibits excellent lightfastness and weather resistance, maintaining color integrity in outdoor plastic applications for extended periods.
• Provides complete chemical resistance to acids, alkalis, and common industrial solvents encountered during plastic part service life.
• Demonstrates superior dispersion uniformity in polyolefins and engineering thermoplastics, reducing streaking and color variation.
• Delivers high tinctorial strength enabling lower pigment loading for cost reduction while achieving target color specifications.

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C.I.NO.: PY181

Advantage:

Main Application Recommended: Plastics

Product Description – PY181

HP YELLOW 1322 (PIGMENT YELLOW 181) is a reddish yellow pigment. Its main area of application is in plastics, especially in polyolefins, which has good heat resistance and light fastness.

Recommended Application：

Plastics: PP, PE, PVC, PS/SAN, ABS, POM, PBT, 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 PY181 / HP Yellow 1322

What specific plastic applications is HP Yellow 1322 (PY181) best suited for?

HP Yellow 1322 (Pigment Yellow 181) is designed primarily for high-performance engineering plastics where strong, opaque yellows are required. It excels in polyamides (PA6, PA66), polycarbonate (PC), and ABS due to its excellent heat resistance up to 300°C. While it can be used in polyolefins like HDPE and PP, its main advantage shines in applications requiring long-term thermal stability, such as automotive interior parts, electrical connectors, and industrial housings. For standard commodity plastics, more cost-effective yellows like PY151 or PY183 may be preferred.

What are the key performance limitations of PY181 in plastics?

The primary limitation of HP Yellow 1322 is its relatively high cost compared to diarylide yellows. Additionally, while PY181 offers outstanding heat stability, it has moderate lightfastness (typically 6-7 on the blue wool scale in full shade) and is not recommended for outdoor applications requiring years of direct sunlight exposure. Its tinting strength is also lower than that of PY183 or PY110, meaning higher pigment loadings may be needed to achieve deep shades. It also shows slight warpage potential in HDPE due to its anisotropic particle shape, so mold design adjustments may be necessary.

How does HP Yellow 1322 compare to its sibling PY183 (HP Yellow 155)?

HP Yellow 1322 (PY181) and HP Yellow 155 (PY183) are both high-performance isoindoline yellows, but serve different needs. PY181 offers superior heat stability (up to 300°C vs. 280°C for PY183), making it the choice for PC and high-temperature nylons. Conversely, PY183 has significantly higher chroma (brighter, cleaner color) and better lightfastness, making it ideal for automotive interiors and visible consumer goods. HP Yellow 1322 is more opaque and cost-efficient for heavy mass tones, while PY183 is preferred for transparent tints. Choose PY181 for extreme heat; choose PY183 for ultimate aesthetics.

What processing conditions or precautions are required when using PY181?

When processing HP Yellow 1322, maintain processing temperatures below 300°C to avoid pigment degradation, which can cause color shift toward olive-green. For polycarbonate, pre-drying the resin-pigment blend at 120°C for 4 hours is recommended to prevent moisture-related streaks. In ABS, use gentle screw speeds to avoid excessive shear, which can destroy the pigment’s crystal structure. For masterbatch production, a loading of 20-30% is typical, using a polyethylene wax carrier. Avoid combining with strongly acidic additives (e.g., certain flame retardants) as PY181 can hydrolyze under prolonged moisture and heat, leading to color loss.

How should HP Yellow 1322 be stored, and what are viable substitution options?

Store HP Yellow 1322 in a cool, dry environment below 30°C with tightly sealed containers, as it is slightly hygroscopic. Shelf life is typically 24 months. If substitution is necessary, PY183 (HP Yellow 155) is the closest match for general-purpose polyolefins, though with reduced heat stability. For nylon applications, PY110 (Irgazin Yellow 2GLTE) provides even higher heat stability but at a higher cost and lower opacity. Avoid replacing with diarylide yellows (PY12, PY13) as they decompose above 200°C. For cost-sensitive commodity plastics, PY151 (Benzimidazolone Yellow H4G) offers a satisfactory compromise at 80% of the heat stability.

HP Yellow 1322 Takeaway: For demanding engineering plastics requiring sustained performance at 300°C, PY181 offers unmatched thermal integrity and opacity. While not the brightest or most lightfast yellow in the high-performance class, its cost-effectiveness for heat-stable, opaque yellows makes it the go-to pigment for durable industrial and automotive components where extreme processing conditions are non-negotiable.

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