PIGMENT YELLOW 83/ HP YELLOW 1688

What Is PY83 / HP YELLOW 1688

CAS 5567-15-7, CI 21108, type Disazo Diarylide. This high molecular weight disazo diarylide offers a reddish-yellow shade with exceptional solvent fastness, making it the dominant choice for packaging gravure and offset inks. Its opaque HR70 variant is specifically positioned for coatings, providing superior lightfastness (5-6 Blue Wool) and heat stability to 200°C, ideal for applications requiring robust solvent resistance and high tinctorial strength.

Why Choose HP YELLOW 1688

For coatings demanding maximum opacity and lightfastness, HP YELLOW 1688 (Opaque HR70) is the definitive choice. Unlike its sibling grades, it sacrifices some transparency to deliver superior hiding power and durability in harsh environments. Compared to HP YELLOW 1576 (optimized for gloss and low viscosity in inks) or HP YELLOW 1680 (semi-opaque), this grade excels where UV and chemical resistance are critical. Its larger molecular structure ensures far better solvent resistance than PY12/13/14, while the opaque variant maintains outstanding tint strength and heat tolerance. Select HP YELLOW 1688 when your coating formulation requires a high-performance yellow that withstands aggressive solvents and prolonged light exposure without fading or bleeding.

Key Features

• Opaque HR70 grade provides exceptional hiding power in coatings, eliminating the need for multiple layers and reducing material costs.
• Blue Wool lightfastness rating of 5-6 ensures color retention in exterior and high-UV coatings, preventing degradation over time.
• Heat stability up to 200°C allows integration into baking enamels and powder coatings without shade shift or decomposition.
• High molecular weight structure delivers superior solvent resistance compared to standard diarylide yellows, preventing bleed in aggressive solvent-based systems.
• Very high tinctorial strength enables lower pigment loading in coatings while maintaining vibrant color intensity, improving cost efficiency.

C.I.NO.: PY83

Advantage: Opaque HR70, Light fastness

Main Application Recommended: Coatings

Product Description -PY83

HP YELLOW 1688 (PIGMENT YELLOW 83) is a bright reddish-yellow azo pigment. It exhibits excellent lightfastness, heat resistance, and solvent fastness, and is opaque. It is used to a considerable extent in most segments of the paints and coatings industry.

Recommended Application:

Coatings: solvent based coatings, water based coatings, industrial coatings, powder coatings, coil coatings, wood coatings
Printing inks: offset inks, solvent based inks

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.

Frequently Asked Questions About PY83

Is PY83 (HP Yellow 1688) suitable for both solvent-based and waterborne industrial coatings?

Yes, HP Yellow 1688 is optimized for solvent-based systems, especially alkyld and polyester melamine baking enamels, but it also performs well in waterborne formulations when pre-dispersed with appropriate wetting agents. Its high color strength and transparency make it ideal for automotive refinish and coil coatings. However, it is not recommended for high-acid or highly alkaline waterborne systems without stabilizer adjustment. For general industrial coatings, it provides excellent gloss retention. HP YELLOW 1688 takeaway: versatile in both systems but requires formulation care in waterborne use.

What are the main performance limits of PY83 in exterior coatings?

PY83 (HP Yellow 1688) exhibits good lightfastness (7-8 on blue wool scale) and weather resistance for moderate exterior use, but it is not suitable for ultra-durable applications like architectural coil coatings exposed to direct equatorial sunlight for years. Its weatherability is limited to about 2-3 years in full sun without a clear topcoat. It tends to fade faster in high-humidity, UV-intense environments compared to more expensive perylene or quinacridone pigments. For indoor or semi-exposed coatings, it is cost-effective. HP YELLOW 1688 takeaway: reliable for indoor/semi-exterior, but not for long-term outdoor extremes.

How does HP Yellow 1688 compare to PY83 from other suppliers or lower-cost variants?

Compared to generic bulk PY83, HP Yellow 1688 offers tighter particle size distribution (0.05-0.2 µm), resulting in 15-20% higher color strength and better transparency in metallic finishes. Unlike standard PY83, it contains surface treatment that improves heat stability up to 220°C, critical for baking finishes. Lower-cost variants often show clay-like dispersibility issues and 10° higher viscosity in mill bases. In color comparisons, HP Yellow 1688 yields a cleaner, greener red-shade yellow without the dullness seen in unpurified grades. HP YELLOW 1688 takeaway: premium quality with superior strength and thermal stability over basic grades.

What dispersion method and equipment are recommended for HP Yellow 1688?

HP Yellow 1688 requires a bead mill or three-roll mill for optimal dispersion; simple high-speed dissolvers fail to break primary aggregates. Recommended process: premix in resin with 20-30% pigment load, then bead mill (zirconia, 0.6-1.2 mm) for 30-45 minutes until fineness <5 µm (Hegman ≥7). Avoid overmilling above 50°C to prevent gloss loss. For solvent-based systems, use ester/alcohol blends; for waterborne, pre-wet with nonionic surfactant. Always test dispersion in your specific resin system, as polyester systems require longer dwell times. HP YELLOW 1688 takeaway: mill dispersion essential; do not attempt high-speed only.

What are the storage conditions and substitution risks for HP Yellow 1688?

Store HP Yellow 1688 in a cool, dry place (below 35°C) in sealed containers; absorbing moisture above 0.5% can cause caking and poor dispersion. Shelf life is 36 months from manufacture under proper conditions. Substitution risks: replacing with PR.108 (molybdate orange) or PO.16 (orange) will drastically shift the hue and reduce transparency. Using PY.42 (iron oxide yellow) will kill brightness and reduce tinting strength by 60%. Only PY.83 itself (from another supplier) is a direct substitute, but performance will vary. HP YELLOW 1688 takeaway: stable if stored dry; never replace with iron oxide or moly oranges.

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