PIGMENT ORANGE 16/ HP ORANGE 3359

What Is PO16 / HP ORANGE 3359

PO16 / HP ORANGE 3359 is an organic pigment with CAS number 6528-34-3 and CI number PO16, classified under the organic pigment type. This high-performance orange shade is a disazo condensation pigment known for its vibrant, warm orange hue and strong tinting strength. It is widely used in industrial applications where consistent color quality and stability are required. The pigment delivers excellent dispersion properties and maintains its brilliant shade even in demanding processing conditions.

Why Choose HP ORANGE 3359

This specific grade, HP ORANGE 3359, is optimized for plastics applications, offering exceptional heat stability and color retention during high-temperature processing. Unlike standard PO16 variants, this grade withstands injection molding and extrusion temperatures without fading or shifting hue. Its superior migration resistance prevents bleeding or blooming in plastic matrices, making it ideal for polyolefins, PVC, and engineering plastics. Compared to sibling yellow or red organic pigments, HP ORANGE 3359 provides a unique mid-orange tone that balances opacity and transparency, while outperforming lower-cost alternatives in lightfastness and chemical resistance. For applications requiring consistent color across production batches and long-term durability in plastic end-products, this grade delivers reliable performance with minimal additive interaction.

Key Features

• Maintains color stability at processing temperatures up to 280°C in polyolefin systems.
• Exhibits excellent bleed resistance in plasticized PVC and thermoplastic compounds.
• Provides high tinting strength with efficient cost-per-unit of color development.
• Demonstrates good lightfastness ratings (7-8 on blue wool scale) for indoor plastic goods.
• Offers consistent batch-to-batch color acceptance without streaking or speckling issues.

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C.I.NO.: PO16

Advantage:

Main Application Recommended: Plastics

Product Description – PO36

HP ORANGE 3359 (PIGMENT ORANGE 16) is a yellowish orange, more reddish than PO13 and PO34, It is recommended used in printing ink industry and plastic industry.

Recommended Application：

Plastics: PP, PE, PVC, PS/SAN, ABS, Rubber/TPV
Printing 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 PO16 / HP Orange 3359 (CAS, CI, for Plastics)

What is the primary application fit for HP Orange 3359 in plastics?

HP Orange 3359 (CAS 3520-72-7, CI Pigment Orange 16) is a high-performance organic pigment designed for demanding plastic applications. It excels in engineering resins such as ABS, polycarbonates, and polyamides, where high processing temperatures (up to 300°C) are required. Its vivid, bright orange shade with good opacity makes it ideal for consumer goods, automotive interior parts, and safety equipment. Unlike some inorganic alternatives, it provides strong color strength without heavy metal content, meeting modern regulatory standards. However, it is less suited for low-cost commodity plastics like polyolefins where more economical pigments suffice.

What are the performance limits of HP Orange 3359 regarding lightfastness and heat stability?

HP Orange 3359 offers good to excellent lightfastness (typically 7-8 on the blue wool scale in full shade), making it suitable for indoor applications but not for extended outdoor exposure without stabilization. Its heat stability is robust up to 280-300°C, allowing processing in most engineering plastics. However, prolonged residence times at peak temperatures can cause slight shade shift or loss of strength. It has limited chemical resistance in aggressive solvents and may bloom in certain polyolefins at high loadings. For continuous outdoor use, alternative pigments like PO36 (CI 71180) or PO71 provide superior UV stability.

How does HP Orange 3359 compare with its sibling Pigment Orange 16 (PO16)?

Trade-named HP Orange 3359 is a specific, surface-treated version of standard CI Pigment Orange 16 (a disazo pigment). The “HP” grade offers improved dispersion, lower dusting, and enhanced thermal stability compared to generic PO16. Standard PO16 may degrade or agglomerate during high-shear processing, reducing color strength. HP Orange 3359 undergoes extra milling and coating, allowing higher pigment loadings without viscosity issues. Both share the same chemical structure (CAS 3520-72-7), but HP Orange 3359 delivers 10-15% higher color yield in ABS and PC. For non-critical applications, standard PO16 is cost-effective, while HP grade is chosen for consistency in precision molding.

What processing conditions should be considered for HP Orange 3359?

This pigment requires adequate dispersion to avoid speckles or reduced color strength. It is recommended to use a masterbatch or pre-dispersion at 0.5-5% loading. Processing above 300°C or with excessive shear can cause decomposition, releasing harmful gases. High-screw RPM in injection molding should be avoided; instead, use gentle mixing profiles. For polyamides, pre-drying the pigment to <0.1% moisture is critical to prevent bubbling. It performs best in ABS at 240-260°C and polycarbonate at 280-300°C. Always conduct a trial for heat history: a 5-minute hold at peak temperature should show <2 delta E color change.

What are the storage and substitution guidelines for HP Orange 3359?

Store in a cool, dry place (<40°C, <60% RH) away from direct sunlight. Opened containers should be resealed tightly to prevent moisture absorption, which can cause agglomeration. Shelf life is typically 2 years under proper conditions. For substitution, if HP Orange 3359 is unavailable, consider PO36 (a naphthol pigment) for better lightfastness, or PO13 (CAS 3520-72-7 variant) for similar thermal stability but lower cost. However, shade matching will be required as PO13 is yellower. Do not substitute with inorganic pigments like Chrome Orange (C.I. 77600) due to heavy metal restrictions. Always verify compatibility with the plastic resin.

**Takeaway:** HP Orange 3359 (PO16) delivers bright, stable orange color for engineering plastics with good heat and light resistance, but requires careful processing and is best suited for indoor uses where consistency and heavy-metal-free performance matter.

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