PIGMENT BLUE 29/ ULTRA BLUE UB465
. When compared to sibling grades—none exist for
Technical Information
What Is PB28 / ULTRA BLUE UB465
CAS 1345-16-0, CI 77346, PB28 / ULTRA BLUE UB465 is a Cobalt Aluminate (CoAl2O4) pigment with a spinel crystal structure. This inorganic blue exhibits a reddish-blue shade and withstands temperatures exceeding 1000°C, surviving conditions that destroy any organic pigment. With excellent lightfastness, chemical resistance, and complete inertness, it offers unmatched durability for demanding applications, though it has lower tinting strength than organic blues and costs more than ultramarine or phthalo blue.
Why Choose ULTRA BLUE UB465
This specific grade delivers lasting brilliance and stability, making it the optimal choice for plastics requiring extreme thermal and chemical stability. ULTRA BLUE UB465 is ideal for engineering plastics, high-temperature ceramics, and architectural coatings where organic pigments would fail. Its non-migrating, completely inert nature ensures consistent performance during high-heat processing, while the reddish-blue shade provides a unique aesthetic advantage. When compared to sibling grades—none exist for this product—users gain confidence in a singular formulation engineered for durability. Choose ULTRA BLUE UB465 when your plastics must endure harsh environments without color shift, degradation, or migration, outperforming organic alternatives in longevity and resilience.
Key Features
- Heat resistance above 1000°C allows use in applications that destroy any organic pigment.
- Reddish-blue shade with excellent lightfastness and chemical resistance for long-term color retention.
- Non-migrating and completely inert behavior prevents color bleeding or interaction with plastic matrices.
- Unmatched durability in engineering plastics, high-temperature ceramics, and architectural coatings.
- Low tinting strength is compensated by superior stability in extreme thermal and chemical environments.
C.I.NO.: PB28
Advantage: lasting brilliance and stability.
Main Application Recommended: Plastics
Product Description – PB29
UB465 (PIGMENT BLUE 29) is a versatile inorganic blue pigment celebrated for its bright, fresh hue and excellent stability—resisting alkali, high temperatures, and outdoor elements like sunlight and weathering. It also excels at neutralizing yellowish tints in white materials (e.g., coatings, papers) and offers good water dispersibility without bleeding or migration, making it ideal for diverse applications.
Recommended Application
Coatings: solvent based paints, water based paints, auto paints, industrial coatings, powder coatings, wood coatings, coil coatings
Plastics: PE, PP, PBT, PVC, PET, EVA, ABS
Technical Data
| Product Information | ||||
| Chemical Type | CAS NO. | 57455-37-5 | ||
| C. I. Name | Pigment Blue 29 | EINECS / ELINCS NO. | 309 – 928 – 3 | |
| C. I. Constitution No. | 77007 | Chemical Formula | Al6Na8O24S3Si6 | |
| Technical Performance | ||||
| Full Shade | Tint | |||
| Weather Resistance | 5 | 5 | Heat Stability °C | 800°C |
| Light Fastness | 7 | 7 | ||
| Physical Properties | ||||
| Physical Form : | Powder | Free sulfur | 500 ppm MAX | |
| Strength | 98-102 | Residue (325 mesh) % | max0.1% | |
| Moiscture % | Max1.0 | Fine Particle size D50 | Max 0.9um | |
| True Density (g/cm3): | 2.35 | |||
| Packaging | ||||
| 25kgs/bag 1000kgs/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”
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.
Why Choose Honor Pigments?
- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
- ✅ Strict Quality Control — ISO 9001 certified with batch-to-batch consistency and zero-defect policy
- 💰 OEM Production Advantage — Competitive pricing without compromising pigment performance
- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
Frequently Asked Questions About PB28 / ULTRA BLUE UB465 (CAS 1345-16-0, CI 77346)
What types of plastics are best suited for PB28 / ULTRA BLUE UB465?
ULTRA BLUE UB465 is a high-performance cobalt aluminate blue pigment (CAS 1345-16-0) specifically engineered for engineering plastics and high-temperature resins. It performs exceptionally well in polycarbonate (PC), polyamide (PA/nylon), ABS, PBT, and polypropylene (PP) systems requiring heat stability above 300°C. The pigment offers excellent chemical resistance, making it ideal for automotive interior parts, electrical connectors, and durable consumer goods. However, it is less recommended for transparent or translucent applications where absolute clarity is required, as the pigment provides a distinct, opaque blue shade. For polystyrene (PS) or acrylic (PMMA), always test dispersion, as the high density of this inorganic pigment may require optimized letdown ratios to avoid streaking.
What are the performance limits of PB28 regarding heat stability and lightfastness?
PB28 / ULTRA BLUE UB465 exhibits outstanding heat stability, typically surviving processing temperatures up to 320°C without significant color shift or degradation, making it suitable for long-cycle injection molding and extrusion. Lightfastness is rated at 7-8 on the blue wool scale, ensuring minimal fading in both indoor and outdoor applications. However, the pigment’s color strength is lower compared to organic blue pigments like PB15 (phthalocyanine), so higher loadings (3-8%) may be necessary to achieve saturated shades. For exterior applications, note that while UV resistance is strong, extremely prolonged direct sunlight exposure combined with high humidity may cause surface chalking over many years, so a UV stabilizer package is advised for outdoor-rated plastics.
How does PB28 compare to other blue pigments like PB15 or ultramarine blue?
Unlike organic PB15 (phthalocyanine blue), ULTRA BLUE UB465 is an inorganic cobalt aluminate, offering superior heat resistance (320°C vs. 280-300°C for PB15), better chemical resistance to acids and solvents, and zero migration risk. Compared to ultramarine blue (PB29), PB28 is much more stable against acidity and sulfurous atmospheres (where ultramarine tends to yellow or bleach). The trade-off is that PB28 has a greener, cleaner blue hue than ultramarine’s reddish-blue, and its tinting strength is lower, meaning you need more pigment to achieve deep shades. Cost-wise, PB28 is typically more expensive than PB15 but cheaper than high-performance ultramarine grades. For regulated applications like food contact plastics, PB28 often meets FDA and EU requirements, whereas some organics may not.
What processing adjustments are needed when using PB28 in injection molding or extrusion?
Due to its high specific gravity (approx. 4.2 g/cm³) and inorganic nature, PB28 / ULTRA BLUE UB465 requires proper dispersion to avoid agglomerates or streaks in molded parts. We recommend using a masterbatch with a compatible carrier resin (e.g., PE or PA-based) rather than direct dosing of pure powder. Processing temperatures should be set at least 10-20°C lower than the pigment’s degradation point to preserve color consistency. For injection molding, high shear rates and back pressure help break down any agglomerates. Also, be aware that the pigment can act as a nucleating agent in semi-crystalline polymers like PP or PA, potentially altering shrinkage and crystallization behavior – always conduct mold flow simulations or pilot trials before production. Drying at 80-100°C for 2-4 hours is recommended if the pigment is pre-blended with hygroscopic resin.
How should PB28 be stored and can it replace other blue pigments in existing formulations?
Store ULTRA BLUE UB465 in a cool, dry environment (below 40°C) away from moisture, as the hygroscopic nature of the powder can lead to caking in high-humidity conditions. Sealed, opaque containers are essential to avoid contamination and color drift. In terms of substitution, PB28 can replace some organic blues where heat stability or chemical resistance is a bottleneck, but it cannot directly replace PB15 on a 1:1 basis by weight due to lower tinting strength. To match a target shade, you will need a reformulation that increases loading by 30-50% and may require adjusting the blue hue with a trace amount of violet or green pigment. For food-contact or toy applications, verify regulatory compliance of the specific UB465 lot, as heavy metal content (cobalt) may be restricted in some jurisdictions below certain threshold limits.
ULTRA BLUE UB465 takeaway: For demanding plastic applications requiring extreme heat stability (320°C+), superb chemical resistance, and durable fade-proof color, PB28 / ULTRA BLUE UB465 delivers an unmatched balance of performance and reliability, though its lower tint strength and higher density mean you must optimize loading and dispersion for cost-effective results in engineering resins.
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