PIGMENT YELLOW 65/ HP YELLOW 1679

What Is PY65 / HP YELLOW 1679

PY65 / HP YELLOW 1679 is an organic pigment with no specific CAS or CI number assigned, classified as an organic pigment type. This high-performance yellow pigment is known for its vibrant, reddish-yellow shade, offering excellent color strength and durability. It is specifically designed for demanding applications where visibility and longevity are critical, particularly in road marking paints. The pigment’s organic nature ensures compatibility with various binder systems, making it a reliable choice for industrial coatings.

Why Choose HP YELLOW 1679

HP YELLOW 1679 is the ideal choice for road marking paints due to its exceptionally high color strength, which ensures bright, clear markings that remain visible even under harsh weather and UV exposure. Its reddish-yellow hue provides superior contrast against asphalt and concrete surfaces, enhancing safety for drivers and pedestrians. Unlike other yellow pigments, HP YELLOW 1679 offers a perfect balance of opacity and weather resistance without requiring additional stabilizers. Since there are no sibling grades for this pigment, it eliminates the need for formulation adjustments or cross-grade comparisons. This unique product stands alone in its ability to deliver consistent, long-lasting performance in high-traffic areas. For road authorities and paint manufacturers seeking a reliable, single-solution yellow pigment, HP YELLOW 1679 reduces complexity while maximizing durability and color retention.

Key Features

• This pigment exhibits exceptionally high color strength, requiring lower loadings to achieve vivid yellow shades.
• Its reddish-yellow hue provides superior visibility and contrast for road marking applications.
• The pigment demonstrates excellent resistance to weathering, UV light, and thermal degradation.
• It offers strong opacity and hiding power, ensuring consistent coverage on dark surfaces.
• HP YELLOW 1679 maintains chemical stability in common binder systems used for traffic paints.

C.I.NO.: PY65

Advantage: High color strength, Reddish

Main Application Recommended: Road Mark paints

Product description – PY65

HP Yellow 1679 (PIGMENT YELLOW 65) exhibits a reddish-yellow shade and excellent hiding power. It bears certain similarities to high-hiding-power P.Y.74, with comparable performance in solvent resistance, recrystallization fastness in solvent-containing media, lightfastness, and durability. Its applicable media include air-drying paints and emulsion paints.

Recommended Application:

Coatings: Road Mark paints, solvent based coatings, water based coatings, industrial paints

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 PY65 / HP Yellow 1679

Why is PY65 specifically recommended for road marking paints instead of other yellow pigments?

PY65 (Pigment Yellow 65) offers an ideal balance of chroma, opacity, and weatherfastness for heavy-duty road markings. Unlike more expensive high-performance pigments, PY65 delivers strong tinting strength and good lightfastness at a cost-effective price point. Its brilliant reddish-yellow shade provides excellent visibility against asphalt and concrete, essential for lane delineation and safety markings. The pigment’s chemical structure also resists bleeding and migration in thermoplastic and cold plastic binder systems. HP Yellow 1679 is a specifically formulated grade that optimizes dispersion properties, reducing milling time and ensuring consistent color batch-to-batch. This makes it a top choice for traffic paint manufacturers who need reliable performance without over-engineering their formulations.

What are the main performance limitations of PY65 in road marking applications?

While PY65 offers excellent initial color and opacity, its main limitation is reduced durability under extreme UV exposure and heavy traffic abrasion compared to diarylide yellows (PY83) or inorganic pigments like lead chromate (now restricted). In high-traffic zones or climates with intense sunlight, PY65-based markings may show measurable fading or chalking after 12–18 months. The pigment also has slightly lower heat stability than some alternatives, meaning it may not be ideal for hot-applied thermoplastics exceeding 200°C for prolonged periods. For these reasons, HP Yellow 1679 is best suited for cold plastic paints or thermoplastic systems operating at moderate temperatures, where its cost-performance ratio clearly outpaces more expensive alternatives. For severe wear zones, blending with a more durable pigment may be advisable.

How does HP Yellow 1679 compare to PY83 (Pigment Yellow 83) for road marking use?

PY83 is considered a “high-performance” diarylide yellow, offering roughly 30% better lightfastness and superior heat stability compared to PY65. However, PY83 is also more expensive and can exhibit excessive strength that requires careful formulation to avoid overpowering the binder system. HP Yellow 1679 (PY65) provides a softer, more workable shade that blends better with white titanium dioxide extenders commonly used in road paints. PY65 also shows less tendency to recrystallize or flocculate during storage, giving it better shelf stability. For standard highway markings and municipal roads, HP Yellow 1679 delivers a more balanced cost-performance equation—the extra durability of PY83 is often unnecessary for markings that will be repainted on a regular maintenance cycle. Only for high-speed, high-traffic highways with 4+ year service life targets would PY83 be clearly preferred.

What are the key processing considerations when formulating with HP Yellow 1679?

HP Yellow 1679 is a monoazo pigment that requires proper dispersion to unlock its full color strength and transparency. We recommend a three-roll mill or high-speed dissolver with a pre-dispersion step in a compatible plasticizer or alkyd resin. The pigment’s pH sensitivity means avoid strongly acidic or alkaline conditions during grinding, which can alter the shade from reddish-yellow toward greenish-yellow. In thermoplastic systems, keep processing temperatures below 190°C to prevent thermal degradation and potential darkening. For cold plastic paints, ensure the pigment is fully wetted before adding hardeners to avoid grit formation. A typical loading rate is 3–8% by weight, depending on the opacity required. Users should also note that PY65 can have slight color shift when applied at different film thicknesses—consistent application methods are key.

How should HP Yellow 1679 be stored, and can it substitute for other yellow pigments in existing formulations?

Store HP Yellow 1679 in a cool, dry place below 30°C, away from direct sunlight and moisture. The pigment is hygroscopic—opened containers should be resealed immediately and used within 6 months to avoid clumping. Substitution for other PY65 grades is straightforward and recommended, as HP Yellow 1679 is specifically optimized for road marking binders. However, direct 1:1 substitution for PY83 or inorganic yellows (e.g., Y.34) will require reformulation: adjust loading levels and check color shift, as the HP Yellow 1679’s lower tinctorial strength and different undertone will change the final shade. Always test in the actual binder system before full-scale production. For a drop-in replacement of an existing PY65, HP Yellow 1679 offers improved dispersion and batch consistency, so users often see reduced grinding time and more stable viscosity. Takeaway: HP Yellow 1679 delivers the reliability of PY65 with enhanced processing ease for road marking paints.

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