PIGMENT BLACK 7/ Carbon Black 140P
Excellent chemical resistance, outdoor durability,
Technical Information
What Is PB28 / Carbon Black 140P
CAS 1345-16-0, CI 77346, PB28 / Carbon Black 140P is a cobalt aluminate (CoAl2O4) spinel pigment. This reddish-blue inorganic compound delivers heat resistance exceeding 1000°C, surviving conditions that destroy organic pigments. It offers excellent lightfastness, chemical resistance, and complete inertness with no migration. Lower tinting strength than organic blues but unmatched durability for extreme applications. As a high-purity furnace-grade carbon black, it delivers deep jet-black masstone and excellent UV protection.
Why Choose Carbon Black 140P
This specific grade provides outstanding chemical resistance, outdoor durability, light resistance, thermal stability, and non-bleeding, non-migration characteristics—making it ideal for plastics and coatings. In engineering plastics, it maintains color integrity through high-temperature processing. For architectural coatings and industrial paints, it withstands harsh UV exposure and aggressive chemicals without degradation. Unlike organic blues that fade or migrate, Carbon Black 140P remains completely stable. While siblings (if any) might offer alternative shades or loadings, this grade excels where extreme thermal and chemical stability is mandatory. It costs more than ultramarine or phthalo blue but is uniquely suited for applications requiring durability above 1000°C, such as high-temp ceramics, coil coatings, and outdoor building materials where longevity outweighs initial cost.
Key Features
- Spinel crystal structure provides heat resistance exceeding 1000°C, surpassing all organic pigment limitations.
- Reddish-blue shade with excellent lightfastness that prevents fading in direct sun exposure for decades.
- Non-migrating and completely inert composition eliminates bleeding in plastic or coating systems.
- Superior chemical resistance withstands acids, alkalis, and solvents without color change or degradation.
- Unmatched durability specifically engineered for high-temperature ceramics and engineering plastics requiring extreme thermal stability.
C.I.NO.: PB28
Advantage: Excellent chemical resistance, outdoor durability, light resistance, thermal stability, non bleeding and non migration characteristics.
Main Application Recommended: Plastics, Coatings
>Product Description – PBk7
>
Carbon Black 140P (PIGMENT BLACK 7), Copper chrome black, delivers exceptional blackness, high tinting strength, and strong hiding power . It features grade 8 light resistance, excellent weather resistance, and good dispersibility in various systems .
>Recommended Application
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Coatings: solvent based paints, water based paints, industrial coatings, powder coatings, wood coatings, coil coatings
Plastics: PE, PP, PBT, PVC, PET, EVA, ABS
>Technical Data
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| Product Information | ||||
| Chemical Type | CAS NO. | 1333-86-4 | ||
| C. I. Name | Pigment Black 7 | EINECS / ELINCS NO. | 215-609-9 | |
| C. I. Constitution No. | Chemical Formula | |||
| Physical Properties | ||||
| Physical Form : | Powder | Tinctorial Strength (%) | 135 | |
| Particle Size (nm) | 22 | Fluidity (㎡/kg) | 30 | |
| Specific Surface Area (BET, ㎡/g) | 220 | PH Value | 2.5 | |
| DBP Absorption Number (cm³/g) | 90 | 45μm Residue Of Sieve (mg/kg) | 19 | |
| Heating Reduction (%) | 1.5 | Blackness (Reflectivity) | 35 | |
| Volatile Matter (Vdaf, %) | 7.5 | |||
| Packaging | ||||
| 10kgs/bag | ||||
| 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.
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Frequently Asked Questions About PB28 / Carbon Black 140P
What specific applications are ideal for PB28 (Carbon Black 140P) in plastics and coatings?
PB28 is specifically engineered for high-performance plastics and industrial coatings where superior jetness and deep black undertones are required. In plastics, it excels in masterbatch applications for automotive trims, electronic housings, and premium packaging where consistent color strength and UV stability are critical. For coatings, it performs well in solvent-based and waterborne systems used in machinery, architectural finishes, and metal protection. Its high tinting strength allows for lower loading levels, reducing cost without sacrificing opacity. Avoid using PB28 in applications requiring conductive properties, as it is not optimized for electrical conductivity.
What are the key performance limitations of PB28 (CAS 1345-16-0) to consider?
While PB28 offers excellent color intensity and dispersibility, it has a relatively high volatile content compared to furnace blacks, which can cause outgassing issues in high-temperature processing (above 250°C) for engineering plastics like nylon or PBT. Its pH is slightly acidic, which may affect curing rates in catalyzed coatings or cause corrosion in metal substrates if not properly formulated. Additionally, it provides moderate UV resistance—adequate for interior applications but not sufficient for exterior aerospace or automotive topcoats without stabilization additives. Always test compatibility with your resin system before scale-up.
How does PB28 compare to Carbon Black 140P or other CI 77346 grades in terms of handling and cost?
PB28 and Carbon Black 140P are essentially the same product under different trade names, both sharing CAS 1345-16-0 and CI 77346. The primary difference is packaging and regional naming conventions. Compared to standard furnace blacks like N330, PB28 offers significantly higher jetness (blue undertone) and better dispersibility in polar resins, but at a premium price point (typically 15–25% higher). For cost-sensitive applications (e.g., general-purpose films or low-grade masterbatch), N550 or N660 grades may be more economical. Always verify the specific surface area (around 80–100 m²/g) and oil absorption to match your formulation needs.
What processing conditions and equipment are recommended for optimal dispersion of PB28?
For plastics, twin-screw extrusion with a high shear configuration (L/D ratio of 40:1 or higher) is ideal, with melt temperatures between 180–220°C. Pre-drying the pigment at 80°C for 2 hours is recommended to remove moisture and prevent agglomeration. In coatings, use a bead mill with 1–1.5 mm zirconia beads at moderate speed (2000–3000 rpm) for at least 3 passes to achieve a Hegman gauge reading of 7+. Avoid excessive shear in waterborne systems, as PB28 can cause foaming; add defoamers early in the letdown stage. For both plastics and coatings, gradual incorporation (10–20% of total liquid first) prevents dusting and ensures wetting.
What is the recommended storage condition and shelf life for PB28, and can it substitute for other carbon blacks?
Store PB28 in a cool, dry environment (below 40°C, relative humidity under 60%) in its original sealed bags to prevent moisture absorption and caking. Under these conditions, shelf life is 24 months from the manufacture date. It can serve as a direct replacement for Pigment Black 7 (PB7) furnace blacks only if you require the specific blue undertone and higher jetness—otherwise, cost and performance trade-offs apply. For substitution of conductive carbon blacks (e.g., Super P), it is not suitable due to its lower surface area and lack of conductivity. Always conduct a side-by-side trial in your actual process with color spectrophotometer validation.
Carbon Black 140P Takeaway: PB28/Carbon Black 140P (CAS 1345-16-0) is a premium high-jetness pigment for plastics and coatings, offering deep blue-black tones and excellent dispersibility. Ideal for masterbatch and industrial finishes, it requires careful high-temperature processing and UV stabilization for exterior use. While costlier than standard furnace blacks, its tinting strength delivers value where aesthetic quality or color consistency is paramount. Always validate compatibility and storage conditions to maximize performance.
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