PIGMENT GREEN 7/ HP GRENN 5557

What Is PG7 / HP GRENN 5557

CAS 1328-53-6, CI 74260, this is a chlorinated copper phthalocyanine green pigment where perchlorination replaces all 16 hydrogen atoms with chlorine atoms, producing a bright bluish-green shade with excellent lightfastness (Blue Wool 8). HP GRENN 5557 is specifically engineered as a low-viscosity, highly dispersible grade optimized for solvent-based ink and solvent-based coating systems, offering the high tinctorial strength standard of the dominant green organic pigment family while providing superior flow properties in liquid formulations.

Why Choose HP GRENN 5557

HP GRENN 5557 is formulated for manufacturers requiring smooth, high-speed processing in solvent-based inks and solvent-based coatings. Its low viscosity reduces shear thinning and allows for higher pigment loading without sacrificing flow, meaning less solvent waste and faster drying cycles. The excellent dispersibility ensures consistent color development with minimal milling time, reducing energy costs and equipment wear. Compared to sibling HP GRENN 5164, the 5557 grade offers a distinct advantage in viscosity control—where 5164 may require additional dispersants or extended grinding, HP GRENN 5557 achieves target rheology more predictably. Choose this grade when your priority is optimizing solvent system throughput, maintaining stable viscosity across batch runs, or working with high-speed printing presses and spray applications where flow consistency directly impacts finish quality and defect rates.

Key Features

• Low viscosity in solvent systems minimizes nozzle clogging and improves transfer efficiency in high-speed gravure and flexographic ink applications, reducing downtime for cleaning.
• Excellent dispersibility allows uniform pigment distribution in solvent coatings without agglomerates, ensuring streak-free finishes and consistent color strength across large surface areas.
• Perchlorinated molecular structure provides exceptional heat resistance up to 200°C, preventing color shift during solvent evaporation or curing processes in industrial coating lines.
• Outstanding lightfastness (Blue Wool Scale 8) maintains chromatic stability under prolonged UV exposure, critical for outdoor solvent-based inks and automotive coatings requiring long-term color retention.
• High tinctorial strength enables lower pigment usage per batch in solvent formulations, reducing raw material costs while achieving target opacity and chromatic intensity.

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C.I.NO.: PG7

Advantage: Low viscosity, Good dispersibility

Main Application Recommended: Slovent based inks, Slovent based coatings

Product Description – PG7

HP GREEN 5557 (PIGMENT GREEN 7) is a Phthalo green pigments, mainly using in industrial paints, construction paints and powder coatings, printing inks etc…, it has excellent fastness, good heat stability and fresh colors.

Recommended Application：

Coatings: solvent based coatings, auto paints, industrial coatings, powder coatings, wood coatings, coil 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”

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 PG7 / HP GRENN 5557 (CAS 1328-53-6, CI 74260)

How does HP GRENN 5557 specifically optimize performance in solvent-based inks vs. solvent-based coatings?

In solvent-based inks, HP GRENN 5557 delivers high color strength and transparency essential for gravure and flexo printing, with excellent solvent resistance to prevent bleeding in overlays. For solvent-based coatings, its fine particle size ensures uniform dispersion in binder systems, minimizing grit and improving gloss retention on metal or plastic substrates. Unlike universal pigments, this grade is chemically engineered for polar solvent systems (e.g., esters, ketones), providing faster drying without sacrificing adhesion. You’ll see sharper print definition in inks and smoother film formation in coatings. HP GRENN 5557 takeaway: Optimized for polar solvent systems—expect vibrant prints in inks and flawless surface coverage in coatings.

What are the thermal and lightfastness performance limits of HP GRENN 5557 in industrial applications?

This pigment withstands continuous heat up to 200°C (392°F) for short durations, making it suitable for stoving enamels or can coatings, but prolonged exposure above 220°C may cause shade shift toward yellowish-green. Lightfastness reaches 7-8 on the blue wool scale in full-depth shades, though thin films (e.g., 1% tint) drop to 5-6—ideal for indoor signage but not architectural exteriors. It resists chemicals like dilute acids and alkalis, but strong oxidizing agents can degrade the phthalocyanine structure. Always test under actual bake cycles, as overbaking reduces chroma. HP GRENN 5557 takeaway: Reliable up to 200°C with good light stability; avoid prolonged high heat or aggressive chemical environments.

How does HP GRENN 5557 compare to standard PG7 grades like BASF Heliogen Green K8730 or Clariant Hansa Green?

HP GRENN 5557 uses a refined gamma-crystal phase with tighter particle size distribution than generic PG7 grades, resulting in 15-20% higher color strength in solvent systems. Against Heliogen Green K8730, it offers comparable heat stability but superior rheology for high-speed printing (reduced viscosity buildup). Versus Clariant’s Hansa Green, HP GRENN 5557 has lower oil absorption, so less resin is needed to reach target viscosity. However, it lacks the full red-shade tilt of some beta-phase phthalocyanines—purely a standard blue-green. It fills the gap between commodity PG7 and ultra-fine niche grades for cost-conscious solvent formulators. HP GRENN 5557 takeaway: Higher strength and better flow than typical PG7—a performance upgrade without the premium price.

What are the optimal dispersion techniques and solvent choices for HP GRENN 5557 to avoid flooding or flocculation?

Use a bead mill with 0.6-1.0 mm yttrium-stabilized zirconia beads at 8-12 m/s tip speed; avoid steel beads to prevent metal contamination. Pre-wet the pigment in a 60:40 blend of methyl ethyl ketone (MEK) and n-propanol for 15 minutes before grinding—this prevents agglomerates from forming stubborn clusters. Add 2-5% of a hyperdispersant like BYK-110 or Solsperse 24000 to anchor onto phthalocyanine crystal edges, combating flocculation during letdown. If flooding occurs (e.g., in white tint), switch to acetate solvents (butyl acetate) slower than ketones to balance color development. Never exceed 35% pigment loading in the millbase. HP GRENN 5557 takeaway: Ketone/alcohol pre-wet and polymeric dispersants are critical to avoid flocculation and maximize transparency.

What storage conditions are required for HP GRENN 5557, and can it substitute PG58 or TX Vat Green 2 in existing formulations?

Store in a cool, dry place (below 30°C, <60% humidity) in sealed containers—the pigment may absorb moisture if exposed, causing mottling in solvent coatings. Shelf life is 3 years in original packaging. As a substitution, HP GRENN 5557 can replace PG58 only if your formulation tolerates a 5-10 nm shift toward a bluer shade; PG58 tends to be yellower. It cannot replace TX Vat Green 2 (C.I. 74100) because that vat pigment offers higher redox stability for electrodeposition coatings. Always run a rheology check—PG7 stiffer flow may require resin adjustment. HP GRENN 5557 takeaway: Not a direct swap for PG58 or vat greens; verify shade and dispersion compatibility before substitution.

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