PIGMENT ORANGE 13/ HP ORANGE 3632

What Is PO13 / HP ORANGE 3632

PO13, also known as HP ORANGE 3632, is an organic pigment with CAS 3520-72-7 and CI 21110. It belongs to the disazo condensation pigment family, offering high chroma and excellent tinctorial strength. This specific grade is formulated for superior performance in water-based systems, combining bright orange shade with process stability. Its chemical structure ensures good lightfastness and weather resistance, making it suitable for exterior-grade applications where color retention is critical. The pigment’s particle size distribution is optimized for ease of dispersion in aqueous media.

Why Choose HP ORANGE 3632

This grade is specifically engineered for water-based coatings and water-based inks, where traditional PO13 variants often face issues like poor wetting, agglomeration, or flocculation. HP ORANGE 3632 features a specialized surface treatment that enhances hydrophilicity, allowing for rapid dispersion without excessive grinding or surfactant loading. Compared to untreated PO13 grades, it achieves higher color strength and gloss in water-based systems. When contrasted with solvent-based siblings, this grade eliminates VOC concerns while maintaining comparable opacity and heat stability. In water-based inks, it provides excellent rheology for flexographic and gravure printing. For water-based coatings, it offers superior compatibility with acrylic and polyurethane resin systems, reducing the risk of seeding or color shift during storage. Its formulation is optimized to meet modern eco-label requirements without sacrificing performance.

Key Features

• Engineered with a hydrophilic surface treatment that ensures rapid and complete dispersion in water-based formulations.
• Exhibits exceptional color development and high gloss when incorporated into water-based acrylic and polyurethane coating systems.
• Maintains stable viscosity and prevents flocculation over extended storage periods in water-based ink paste concentrates.
• Offers enhanced lightfastness (ISO 12040 rating 7-8) and weather resistance suitable for outdoor decorative and industrial water-based paints.
• Provides broad compatibility with common waterborne binder systems, minimizing color shift and seeding issues during letdown.

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C.I.NO.: PO13

Advantage:

Main Application Recommended: Water based coatings, Water based inks

Product Description – PO13

HP ORANGE 3632 (PIGMENT ORANGE 13) is recommended for water based coating or inks. Its fastness to light is average, and fast to paraffin, butter, and soap. They withstand heat very well and are stable up to 200°C. its lightfastness suits the purpose. Likewise, its resistance to clear lacquer coatings and to sterilization are excellent.

Recommended Application：

Coatings: solvent based coatings, water based coatings, industrial coatings, powder coatings
Plastics: PE, PVC, Rubber/TPV, SBC
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 PO13 / HP Orange 3632

1. What specific water-based systems are ideal for HP Orange 3632?

HP Orange 3632 (Pigment Orange 13, CAS 3520-72-7, CI 21110) is a disazo pigment specifically optimized for waterborne systems. It performs exceptionally well in water-based architectural coatings (interior/exterior acrylics) and water-based flexographic/gravure inks for paper and board packaging. Its high chroma and good dispersion characteristics make it a top choice for vivid orange shades where opacity and heat stability up to 180°C are required. Avoid use in high-solvent or purely solvent-based systems where its particle size and surface treatment may not stabilize.

2. What are its main performance limitations in terms of lightfastness and weather resistance?

While HP Orange 3632 offers excellent tinting strength and high gloss in deep shades, it is classified as having only fair to moderate lightfastness (typically 4-5 on the Blue Wool scale in full shade). It is not recommended for exterior applications requiring long-term UV durability (e.g., automotive or architectural exterior topcoats). If you need superior outdoor fade resistance, consider transitioning to a high-performance perinone or DPP orange pigment. For indoor packaging or decorative coatings, its durability is fully adequate.

3. How does HP Orange 3632 compare to Pigment Orange 5 or Pigment Orange 34?

Compared to PO5 (dinitraniline orange), HP Orange 3632 offers a cleaner, yellower shade and significantly better heat stability (suitable for lamination and sterilisation processes). Versus PO34 (another disazo orange), PO13 is generally more cost-effective and provides higher opacity at equivalent loading. However, PO34 may offer slightly better solvent resistance in aggressive ink systems. For most water-based packaging inks and emulsion paints, HP Orange 3632 delivers the best balance of brightness, economy, and processability.

4. Are there any specific dispersion or processing challenges I should anticipate?

HP Orange 3632 has a standard surface treatment that disperses readily in waterborne resin systems using a high-speed dissolver or bead mill. The key challenge is over-dispersion: prolonged milling can cause particle recrystallisation, leading to a duller shade and reduced colour strength. Maintain mill temperatures below 50°C and use a low-shear approach once full colour development is reached. For optimal stability, pre-disperse the pigment with a wetting agent compatible with your acrylic or water-based resin.

5. What are the storage requirements and best substitutes if HP Orange 3632 becomes unavailable?

Store HP Orange 3632 in a cool, dry place in sealed containers. It has a shelf life of at least 2 years under these conditions, but avoid high humidity (>70% RH) to prevent caking. If substitution is necessary, the closest alternatives are Pigment Orange 13 from other ISO-certified sources (verify CAS 3520-72-7) or, for a slight shift toward a redder shade, Pigment Orange 34. For greener, brighter shades, consider blending with PY83. Always test the substitute for rheology and bleed resistance in your specific water-based vehicle.

Takeaway: HP Orange 3632 (PO13) is your go-to high-opacity, bright orange for water-based coatings and inks, offering excellent cost-performance for indoor packaging and decorative applications when process control and storage conditions are respected.

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