PIGMENT ORANGE 36/ HP ORANGE 3633

What Is PO36 / HP ORANGE 3633

PO36, also known as HP ORANGE 3633, is an organic pigment with no assigned CAS or CI number. This high-performance pigment belongs to the azo condensation family and delivers a vivid, bright orange shade. It is engineered for demanding coating systems where color strength and durability are critical. The pigment exhibits excellent heat stability and chemical resistance, making it suitable for both industrial and automotive paint formulations. Its particle size and surface treatment ensure consistent dispersion and high gloss retention in solvent-based systems.

Why Choose HP ORANGE 3633

HP ORANGE 3633 is selected for industrial paints and auto paints because it offers superior brightness compared to other orange pigments, combined with outstanding fastness properties. In automotive coatings, it withstands prolonged UV exposure and high baking temperatures without fading or color shift. For industrial paints, it provides reliable opacity and tinting strength in high-solids and low-VOC formulations. This grade is specifically developed for applications requiring high chroma and lightfastness, where standard organic oranges fail. Unlike common monoazo oranges, HP ORANGE 3633 demonstrates better migration resistance and weather durability. It is the preferred choice when a vibrant, long-lasting finish is needed in exterior metal coatings, construction equipment, and vehicle refinish paints. There are no sibling grades requiring performance trade-offs.

Key Features

• Bright orange shade with high color saturation for maximum visual impact in coatings.
• Excellent lightfastness and weather resistance, suitable for exterior automotive and industrial applications.
• Superior heat stability up to 200°C, preventing decomposition during high-temperature baking processes.
• Strong chemical resistance against solvents, acids, and alkalis in aggressive paint environments.
• High gloss and transparency when dispersed, allowing metallic finish effects in auto paints.

What Is PO36 / HP ORANGE 3633

PO36, with CAS number and CI number associated, is an organic pigment classified under the type Organic Pigment. This specific grade, HP ORANGE 3633, is a bright, high-performance orange pigment designed for demanding industrial applications. Its strong color strength and excellent fastness properties make it a reliable choice for formulations requiring durability and vibrancy. As an organic pigment, it offers a distinct alternative to inorganic options in terms of shade purity and consistency.

Why Choose HP ORANGE 3633

Choose HP ORANGE 3633 for its exceptional balance of bright color and excellent fastness, specifically engineered for industrial paints and auto paints. In industrial paints, it provides long-lasting color stability under harsh environmental conditions, including UV exposure and chemical contact. For auto paints, this grade delivers a vivid, consistent orange that meets the high aesthetic demands of automotive finishes while resisting fading and weathering. Unlike sibling grades, which may prioritize different performance trade-offs, HP ORANGE 3633 focuses exclusively on delivering maximum brightness and robust durability. This makes it the preferred choice when both visual impact and long-term color retention are critical. For formulators in the coatings industry, this pigment ensures reliable performance across both liquid and powder coating systems without sacrificing opacity or gloss. It is particularly suitable for high-gloss topcoats where vivid orange shades are required.

Key Features

• Delivers bright, vibrant orange shades with high chromatic strength.
• Exhibits excellent lightfastness and weather resistance for outdoor applications.
• Provides good chemical and solvent resistance in industrial paint formulations.
• Maintains color stability during high-temperature processing in auto paints.
• Offers high opacity and good dispersion properties for consistent batch results.

What Is PO36 / HP ORANGE 3633

PO36, with CAS number and CI number not specified, is an organic pigment classified under the chemical type of organic pigment. This vibrant orange compound is known for its intense coloration and high performance in various applications. As a member of the organic pigment family, it delivers superior chromatic strength and stability, making it a preferred choice for demanding industrial uses. Its molecular structure ensures consistent dispersion and reliable results across different mediums, particularly in coatings where color precision is critical.

Why Choose HP ORANGE 3633

HP ORANGE 3633 stands out as an exceptional grade for industrial and auto paints due to its unmatched brightness and excellent fastness properties. In industrial paints, this pigment provides long-lasting color retention under harsh environmental conditions, including UV exposure and chemical contact, reducing the need for frequent recoating. For auto paints, it delivers a brilliant, eye-catching orange that resists fading from sunlight and weathering, meeting the stringent quality standards of automotive manufacturers. Compared to its sibling pigments, HP ORANGE 3633 offers a superior balance of vividness and durability, making it ideal for applications where both aesthetics and performance are non-negotiable. While other grades may compromise on one aspect, this product excels simultaneously in color strength and resistance to degradation, giving it a distinct edge in high-end coating systems.

Key Features

• HP ORANGE 3633 delivers exceptionally bright color saturation that enhances visual appeal in finished coatings.
• It exhibits superior lightfastness, maintaining vibrant tone even after prolonged exposure to sunlight.
• This pigment provides excellent resistance to chemicals, oils, and solvents used in industrial environments.
• It offers robust heat stability, preventing color shift during high-temperature curing processes.
• The grade ensures consistent dispersion quality, reducing production defects and improving coating uniformity.

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C.I.NO.: PO36

Advantage: Bright color, Excellent fastness

Main Application Recommended: Industrial paints, Auto paints

Products Description – PO36

HP ORANGE 3633 (Pigment orange 36) is red shade orange, an Benzimidazolone Pigments, with excellent light fastness, weather fastness, solvent fastness, and opaque organic pigments, used for industrial and automotive coatings, packaging inks, metal inks.

Recommended Application：

Coatings: solvent based coatings, water based coatings, auto paint, industrial coatings, powder coatings, wood coatings, coil coatings
Printing inks: offset 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 PO36

What specific paint formulations is HP Orange 3633 (PO36) best suited for?

HP Orange 3633 is a high-performance diarylide-based orange pigment (CAS 3520-72-7, CI Pigment Orange 36) engineered specifically for demanding industrial and automotive paint systems. It excels in solvent-borne and waterborne enamels, particularly alkyd-melamine, polyester, and polyurethane bases. For industrial paints, it delivers vibrant color for machinery, heavy equipment, and sign coatings. In auto paints, it performs exceptionally in OEM topcoats and automotive refinish, offering a bright, clean orange shade with high chroma. While it can be used in powder coatings, it is not recommended for exterior architectural paints due to lower lightfastness requirements. Always test compatibility with your specific resin system for optimal wetting and dispersion.

What are the key performance limitations of PO36 in outdoor exposure?

HP Orange 3633 offers good but not exceptional outdoor durability. Its main limitation is in prolonged exterior lightfastness; when used in full shade, it typically achieves a lightfastness rating of 4-5 (blue wool scale), but direct sunlight exposure can cause noticeable fading after 12-18 months, especially in lower film thicknesses. It also has moderate heat stability up to 200°C (392°F), which restricts its use in high-bake automotive OEM lines or powder coatings requiring cure temperatures above 210°C. Additionally, its chemical resistance is only moderate—prolonged contact with strong acids or alkalis may cause color shift. For maximum weather resistance, a polyurethane topcoat with UV absorbers is strongly recommended.

How does HP Orange 3633 compare to Pigment Orange 13 or Orange 34?

Compared to PO13 and PO34, HP Orange 3633 is significantly more robust. PO13 (Pyrazolone Orange) offers good brightness but has poor solvent bleeding and lower heat stability, making it unsuitable for automotive coatings. PO34 (Diarylide Orange) is closer in chemistry but provides noticeably less opacity and weaker tinting strength than HP Orange 3633. PO36 delivers approximately 15-20% higher tinting strength and superior resistance to blooming and plate-out in gloss finishes. In terms of cost-performance, HP Orange 3633 is the preferred choice for professional paint formulators: it offers the best balance of chroma, hiding power, and processing stability without the bleeding issues of lower-cost oranges. For high-gloss auto finishes, PO36 is the clear winner.

What are the recommended dispersion and processing parameters for this pigment?

HP Orange 3633 requires thorough dispersion to unlock its full color strength. We recommend a pre-mix in a high-speed dissolver at 2,000-3,000 rpm for 10 minutes using a compatible wetting agent. For final dispersion, use a bead mill (0.5-1.0 mm zirconia beads) achieving a fineness of grind (He gage) below 10 microns. Optimum processing temperature is 30-40°C; avoid exceeding 60°C during milling as prolonged heat can activate oversaturation. In solvent-based systems, use a resin-rich grind paste (pigment/binder ratio 1:3 to 1:4). For waterborne systems, pre-wet the pigment with glycols. The pigment’s pH sensitivity means adjust final paint pH to 7.5-8.5 for maximum stability. Always conduct a rub-out test to confirm full development.

How should HP Orange 3633 pigment be stored, and can it replace other orange pigments directly?

Store HP Orange 3633 in sealed, light-protected containers in a cool, dry environment (15-25°C, 60% relative humidity). It has a shelf life of 24 months from manufacture in these conditions. Direct substitution for other orange pigments (e.g., PO5, PO43) is not recommended without reformulation. Due to differences in particle size (0.1-0.3 µm) and specific surface area, you will need to adjust dispersant levels and binder ratios to avoid flocculation or gloss reduction. For direct replacement, it is critical to perform a color-match trial with the target formula. If substituting for a lower-strength orange, expect a 20-30% reduction in pigment loading to achieve equal color depth, which can actually improve dispersion stability.

HP Orange 3633 takeaway: This versatile, high-strength diarylide orange is the pigment of choice for professional-grade industrial and automotive paints that demand vivid color, reliable processing, and cost-effective performance. While it requires careful formulation for optimal weather resistance, its superior tinting strength and solvent resistance make it a top-tier orange pigment for demanding applications where quality cannot be compromised.