PIGMENT BLUE 15:6/ HP BLUE 4656
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Technical Information
C.I.NO.: PB15:6
Advantage:
Main Application Recommended: Coatings
Product Description -PB15:6
HP BLUE 4656 (PIGMENT BLUE 15:6) is the ε-modification of phthalocyanine blue. It delivers the reddest blue shade and exhibits good overall resistance properties, including resistance to organic solvents, as well as excellent lightfastness and weatherfastness. It is primarily used in the paints industry and plastics sector.
Recommended Application：
Coatings: solvent based coatings, water based coatings, auto paints, industrial coatings, powder coatings, coil coatings wood coatings
Plastics: PE, PP, PVC, EVA, ABS
Technical Data:
| Product Information | ||||
| Chemical Type | Phthalocyanine | CAS NO. | 147-14-8 | |
| C. I. Name | Pigment Blue 15:6 | EINECS / ELINCS NO. | 205-685-1 | |
| C. I. Constitution No. | 74160 | Chemical Formula | C32H16CuN8 | |
| Technical Performance | ||||
| Full Shade | Tint | |||
| Weather Resistance | 5 | 4~5 | Heat Stability °C | 300°C |
| Light Fastness | 8 | 7 | ||
| Physical Properties | ||||
| Physical Form | Powder | Bleeding in Xylene | 5 | |
| Specific Density (g/cm3): | 1.68 | Bleeding in Methyl Ethyl Ketone | 5 | |
| Specific Surface(㎡/g): | 54 | Bleeding in Ethyl Acetate | 5 | |
| Oil Absorption | 55-75 | Bleeding in Cellosolve | 5 | |
| pH Value | 6.0~9.0 | Bleeding in Mineral Turpentine | 5 | |
| Volatile Matter | 1% max | Resistance to Acid | 5 | |
| Resistance to Alkali | 5 | |||
| Packaging | ||||
| 25kgs/bag 400kgs/Pallet | ||||
| Storage | Shelf Life | 5 years | ||
| Should be stored in cool, dry and ventilate place. | ||||
| TRANSPORTATION | ||||
| Avoid inversion, sunlight, moisture and crash. Avoid damage the package. | ||||
- 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 – The information given in this data sheet is based on the present state of our knowledge & is intended as a general description of our products & their possible applications. Due to the multitude of formulations, production & application conditions, all the above mentioned data have to be adjusted to the circumstances of the processor. No liabilities, including those for patent rights, can be derived from this fact for individual cases. It cannot be ruled out that this product 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.
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- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
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- 💰 OEM Production Advantage — Competitive pricing without compromising pigment performance
- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
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Frequently Asked Questions — PIGMENT BLUE 15:6
What is the distinct shade characteristic of PIGMENT BLUE 15:6 compared to other phthalocyanine blues?
PIGMENT BLUE 15:6 (HP BLUE 4656, CAS 147-14-8, C.I. Pigment Blue 15:6) is the ε-crystal modification of phthalocyanine blue, delivering the reddest blue shade among copper phthalocyanine pigments. This unique crystallographic form provides the strongest reddish hue, which is critical for achieving high-saturation color spaces in automotive OEM and refinish coatings. The ε-modification also enhances resistance to flocculation and recrystallization in solvent-borne systems, ensuring consistent shade stability across application conditions.
Is PIGMENT BLUE 15:6 suitable for solvent-based and water-based industrial coatings?
Yes, PIGMENT BLUE 15:6 is recommended for both solvent-based and water-based coatings based on its application data. It demonstrates excellent overall resistance properties, including resistance to organic solvents (xylene, methyl ethyl ketone) and outstanding lightfastness and weatherfastness, making it ideal for outdoor industrial coatings. In waterborne systems, proper dispersant selection is needed to optimize wetting, but the pigment itself maintains good chemical stability. Typical end uses include automotive paints, industrial coatings, powder coatings, coil coatings, and wood coatings.
How does the heat stability of PIGMENT BLUE 15:6 perform in high-temperature plastic processing?
PIGMENT BLUE 15:6 maintains heat stability up to 300°C, as specified in the technical data, making it suitable for engineering plastics like ABS and high-temperature processing of PE, PP, PVC, and EVA. This thermal resistance ensures no shade shift or degradation during injection molding, extrusion, or blow molding. For powder coating applications, the pigment withstands curing cycles at typical temperatures (180-220°C) without loss of color strength or gloss. Always verify with a small-scale trial for your specific residence time and temperature profile.
What physical properties of PIGMENT BLUE 15:6 influence its dispersibility in masterbatch?
Key physical properties include a specific density of 1.5–1.6 g/cm³ and a specific surface area of 40–70 m²/g, as listed in the product data sheet. The higher surface area enhances color strength but requires optimized wetting agents to achieve full dispersion in polyolefin masterbatches. The pigment shows low bleeding in xylene and methyl ethyl ketone, indicating good compatibility with common plasticizers and solvents used in masterbatch production. For PE and PP masterbatches, a pre-dispersion step with high-shear mixing is recommended to break agglomerates and achieve uniform color distribution.
Why is the ε-crystal modification of PIGMENT BLUE 15:6 preferred for automotive coatings?
The ε-crystal form of PIGMENT BLUE 15:6 delivers the reddest blue shade and superior weathering resistance, which are critical for automotive OEM topcoats and repair paints. Its excellent lightfastness and solvent resistance minimize shade drift under UV exposure and chemical attack (e.g., fuel, acid rain). Compared to α or β modifications, the ε-phase provides better flocculation resistance, ensuring consistent gloss and opacity over the vehicle lifetime. Technical data confirms heat stability up to 300°C, allowing compatibility with high-solid baking systems used in automotive coating lines.