PIGMENT YELLOW 97/ HP YELLOW 1636

What Is PY97 / HP YELLOW 1636

The product PY97 / HP YELLOW 1636, with no assigned CAS or CI number, is an organic pigment classified under the diarylide yellow family. This pigment is known for its strong green-shade yellow hue, high tinting strength, and good lightfastness properties. Specifically formulated for demanding coating applications, it provides excellent dispersion and color consistency. As a versatile organic pigment, it serves as a reliable colorant in industrial and water-based systems.

Why Choose HP YELLOW 1636

HP YELLOW 1636 is specifically designed to excel in water-based coatings and industrial coatings, where its superior heat stability and chemical resistance outperform many standard yellows. In water-based formulations, it offers low foaming and exceptional stability under alkaline conditions, making it ideal for architectural and can coatings. For industrial coatings, it delivers durable color retention in high-solids systems and resists blooming or migration even under aggressive curing environments. Unlike some sibling grades that sacrifice strength for transparency, HP YELLOW 1636 maintains high opacity and covering power without excessive loading. When compared to inorganic yellows, it provides brighter chromaticity and lower specific gravity, reducing formulation costs. There are no direct sibling grades available, allowing this product to stand alone as a consistent, high-performance solution for formulators seeking a reliable yellow pigment with predictable behavior across multiple binder systems.

Key Features

• PY97 exhibits excellent heat stability up to 200°C, making it suitable for baking enamels and stoving finishes.
• The pigment provides strong color strength with high transparency in organic solvent-based systems.
• It demonstrates good alkali resistance and soap resistance, ensuring stability in water-based coating formulations.
• HP YELLOW 1636 offers outstanding lightfastness in full shade, retaining color integrity under prolonged UV exposure.
• Its fine particle size distribution enables easy dispersion and reduces milling time during production.

C.I.NO.: PY97

Advantage: Yellow FGL

Main Application Recommended: Water based coatings, Industrial coatings

Product Description -PY97

HP YELLOW 1636 (PIGMENT YELLOW 97) is a medium yellow shade, it is more resistant to most organic solvents then the others. Its migration fastness properties are also superior. It also has more heat resistance, and very lightfast and durable properties. It is mainly recommended for industrial finishshes, water based paints, printing inks and also in plastics, lend color etc.

Recommended Application

Coatings: water based coatings, industrial coatings, wood coatings
Plastics: PE, PP, PVC, EVA, ABS
Printing inks: offset inks, solvent based inks, water 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 PY97 / HP Yellow 1636

What specific applications is HP Yellow 1636 best suited for in water-based and industrial coatings?

HP Yellow 1636 (PY97) is specifically optimized for high-performance water-based coating systems and industrial solvent-based formulations. It excels in architectural paints, industrial enamels, and automotive refinish coatings where strong hiding power and vibrant color are required. Unlike some organic yellows that struggle in alkaline environments, HP Yellow 1636 offers robust stability across typical coating pH ranges, making it ideal for cementitious paints, water-based acrylics, and epoxy primers. Its high opacity allows formulators to reduce pigment loading while maintaining excellent coverage, which is especially beneficial in industrial maintenance coatings, coil coatings, and general metal finishes where durability and efficiency are paramount.

What are the key performance limitations of PY97 I should know about before formulation?

While HP Yellow 1636 delivers excellent overall performance, it has specific limitations. Its lightfastness is rated as good but not outstanding for long-term exterior exposure, meaning it may show fading in direct, intense sunlight over several years. It is not recommended for high-temperature curing systems above 200°C, as thermal degradation can cause color shift. Additionally, PY97 can exhibit slight solubility in strong organic solvents, so formulations with aggressive solvent blends (e.g., ketones or esters) require pre-testing. For maximum weather resistance in premium exterior industrial coatings, consider blending with a more lightfast yellow like PY184 or use a UV stabilizer package to maintain color integrity.

How does HP Yellow 1636 compare to PY83 (Diarylide Yellow) for industrial coatings?

HP Yellow 1636 (PY97) and PY83 are both Diarylide Yellows, but PY97 offers distinct advantages. HP Yellow 1636 provides significantly higher color strength and better heat stability than PY83, making it more suitable for baking enamels and industrial coatings that require consistent color after curing. PY83 is more economical but has inferior lightfastness and bleeding resistance in solvent-based systems. For water-based coatings, PY97 shows improved dispersibility and less foaming during letdown. However, PY83 remains a cost-effective choice for interior or low-durability applications where extreme performance is not critical. For long-term outdoor durability or high-temperature processes, HP Yellow 1636 is the superior technical choice.

What are the best dispersing and grinding methods for HP Yellow 1636 in water-based systems?

For optimal color development and hiding power, HP Yellow 1636 should be pre-dispersed using a high-speed disperser (HSD) at 4000-5000 rpm for 15-20 minutes, or passed through a bead mill for finer particle reduction. Use an acrylic or polyurethane dispersant specifically designed for organic pigments at 10-20% of pigment weight. Avoid over-grinding, which can reduce gloss and increase viscosity; target a Hegman gauge reading of 6-7 (fine grind). For water-based systems, maintain pH between 7.5-9.0 during grinding to prevent flocculation. Always add a wetting agent to facilitate pigment wetting and reduce foam. Pre-test with the specific resin system, as some alkyd-modified emulsions may require adjusted dispersant levels.

How should I store HP Yellow 1636, and can it be substituted for other yellow pigments in existing formulas?

Store HP Yellow 1636 in a cool, dry area below 30°C, away from direct sunlight and moisture. The powder form is hygroscopic and may clump if exposed to humidity above 60% RH—reseal containers tightly after use. Shelf life is typically two years from manufacture date. As a direct substitution, HP Yellow 1636 can replace PY83 or PY13 in most water-based and industrial formulas with minimal reformulation, but it has slightly stronger tinting strength—reduce loading by 5-10% initially to match color. It is not a direct drop-in for PY74 or PY154 due to differences in undertone and opacity. Always conduct a full compatibility test for viscosity, gloss, and adhesion before large-scale production. For regulatory compliance, verify that your formula’s VOC limits remain unchanged.

Takeaway: HP Yellow 1636 (PY97) delivers strong opacity, excellent dispersibility, and reliable heat stability for water-based and industrial coatings, making it a versatile, high-performance yellow for demanding formulations.

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