PIGMENT YELLOW 13/ HP YELLOW 1342

What Is PY13 / HP YELLOW 1342

CAS 5102-83-0, CI 21100, Disazo Diarylide yellow. This specific grade is a slightly redder, high-strength yellow pigment engineered primarily for plastics applications, where its enhanced transparency versus standard PY12 allows for cleaner, brighter colorations in transparent and translucent polymer systems. Its niche lies in delivering superior color purity and a distinct, slightly warm yellow shade for demanding plastic masterbatch and compounding operations.

Why Choose HP YELLOW 1342

Choose HP YELLOW 1342 when you need a high-transparency disazo yellow for plastics that outshines standard PY12 in multi-color blending and letdown applications. In plastics, its slightly redder and cleaner undertone produces vibrant, high-clarity tints without muddying, making it ideal for transparent packaging, toys, and consumer goods. Unlike its sibling HP YELLOW 1534, which prioritizes maximum gloss and high transparency, HP YELLOW 1342 balances strong color strength with good processability and reliable lightfastness (rated 4-5). Pick this grade when you require a workhorse yellow for plastics that offers both improved transparency for color effects and consistent performance across polyethylene, polypropylene, and styrenics, without sacrificing heat stability or dispersion quality.

Key Features

• High transparency compared to standard PY12 enables cleaner, more brilliant color effects in plastic masterbatches and letdowns, critical for transparent packaging and multi-color molding.
• Excellent color strength allows for lower pigment loading to achieve target shades, reducing overall formulation cost while maintaining vibrancy in plastic compounds.
• Slightly redder shade than PY12 provides a distinct warm yellow tone that expands color space options for designers and compounders in consumer plastics.
• Lightfastness rating of 4-5 ensures good resistance to fading in indoor plastic applications, extending product life for toys, housewares, and opaque packaging.
• Reliable heat stability and dispersion in polyolefins and styrenics supports consistent processing during injection molding and extrusion, reducing rejects and color variation.

C.I.NO.: PY13

Advantage:

Main Application Recommended: Plastics

Product Description – PY13

HP YELLOW 1342 (PIGMENT YELLOW 13) is a mid-shade diarylide yellow pigment. It is a cost effective pigment and be recommended in PVC and PVC compound applications.

Recommended Application:

Plastics: PP, PE, PVC, 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 PY13

Why does HP Yellow 1342 suit polyolefins like HDPE and PP better than other plastics?

PY13’s chemical structure (an arylide yellow) offers excellent compatibility with non-polar polyolefin melts. In HDPE and PP, it resists bleed and migration during injection molding or blow molding up to 260°C. Its high tinting strength reduces loading levels, minimizing warpage in thin-wall parts. However, in polar polymers like PVC or ABS, the pigment may interact with stabilizers, leading to shade shifts or reduced heat stability. Always test in your specific resin system, as crystallization behavior of semi-crystalline plastics can alter color development. **Takeaway:** HP Yellow 1342 excels in polyolefins due to low migratory risk and thermal resilience—ideal for bottle caps and crates.

What are the exact lightfastness and weather resistance limits of HP Yellow 1342 in outdoor plastic applications?

PY13 typically achieves a lightfastness rating of 6–7 (ISO 105 B02, 1–8 scale) in full-shade HDPE at 1% pigment loading. However, in thin films (below 0.2 mm) or pastels, UV degradation accelerates, causing fading within 6–12 months outdoor. For long-term exterior use (e.g., outdoor furniture), a UV stabilizer package is mandatory. Unlike pigmented automotive grades, HP Yellow 1342 lacks an opaque coating; its weather resistance is moderate. We observe ~30% strength loss after 1000 hours in xenon-arc tests. **Takeaway:** HP Yellow 1342 suits indoor or short-term outdoor plastics; for 5+ year weatherability, upgrade to a quinacridone or benzimidazolone yellow.

How does HP Yellow 1342 differ from PY13 variants like PY13-9S or PY13-ML in plastic masterbatches?

HP Yellow 1342 is a standard uncoated powder with specific surface area (~25 m²/g), while PY13-9S is coated with a synergistic wetting agent for faster dispersion in PE wax carriers. PY13-ML (modified low-dust) uses a micro-encapsulated form to reduce airborne fines. HP Yellow 1342 offers cost efficiency at scale, but requires two-pass extrusion or a dispersion aid for streak-free letdowns below 0.5% dosage. In contrast, PY13-9S melts into the polymer faster, lowering back-pressure in injection molding. For color consistency across batches, HP Yellow 1342 performs reliably when dispersion is confirmed via a 50 µm filter test. **Takeaway:** HP Yellow 1342 is a workhorse grade; choose coated variants only if your process lacks high-shear compounding equipment.

What special processing steps are needed to avoid plate-out or nozzle clogging with HP Yellow 1342 in injection molding?

PY13 can plate-out on mold surfaces if the melt temperature exceeds 280°C, especially in acetal resins. To prevent clogging, pre-dry the pigment at 60°C for 2 hours to eliminate moisture, then use a 100-mesh screen pack at the nozzle. A back-pressure of 10–15 bar ensures uniform dispersion in the plastification unit. Avoid calcium stearate lubricants—they compete with the pigment’s surface adhesion, causing die-build. For thin-wall, high-speed molding, incorporate a separate wax dispersant (e.g., EBS) at 2% of pigment weight. **Takeaway:** HP Yellow 1342 demands controlled temperature and screen packs; discipline here avoids costly downtime from clogged gates.

What is the recommended shelf life and replacement strategy if HP Yellow 1342 ages? Can it be swapped with PY83 or PY14 without re-certification?

Store HP Yellow 1342 in a cool (below 30°C), dry environment—shelf life is 24 months from production if sealed. After that, compaction may reduce bulk density by 15%, requiring a grinding step. Aged pigment often shows 5–10% lower tint strength and increased residue (over 0.5% on 45 µm sieve). Swapping to PY83 (which is more reddish) or PY14 (higher oil absorption) will change brightness and viscosity; re-certification is mandatory for critical applications like packaging. PY83 also shifts opacity, while PY14 demands higher loading to match depth. Always run a mini-peak heat test and a colorimetric scan before substitution. **Takeaway:** HP Yellow 1342 is stable—replace with the exact grade if within 2 years; never assume compatibility with sister variants without full formulation revalidation.

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