Pigment Red
Pigment Red 22 (Starwin Red 22)
Pigment Red 22 (CAS No. 6410-34-0, C.I. 12370) is a Monoazo organic pigment offering a bright yellowish red shade with high transparency and excellent color purity. Specially processed for superior transparency in ink films, it excels in process color printing, transparent overprint applications, and multi-color lithographic work where clean color separation is critical. Its fine particle size and optimized surface treatment ensure smooth dispersion in both solvent-based and water-based media, delivering consistent hue, strong tinting strength, and reliable performance across offset, flexo, and gravure printing platforms.
Key Information
技术规格
Product Overview
颜料红 22，注册号为 CAS 6410-34-0 和 C.I. 12370，是一种单偶氮有机颜料，能呈现出洁净明亮的黄红色，具有显著的高透明度。这一高透明特性使其在单偶氮红颜料家族中脱颖而出，成为工艺色印刷的首选颜料，尤其适用于对色彩分离精度和叠印效果要求严格的场景。
Starwin Red 22 is manufactured by Hangzhou Starwin Tech Co., Ltd. using controlled precipitation and finishing processes that yield a fine, uniform particle size distribution. This careful control over particle morphology translates directly into smooth, defect-free ink films with excellent gloss and transparency — qualities that are indispensable in high-quality commercial and packaging printing.
Key Identification
| Property | 价值 |
|---|---|
| C.I. Generic Name | Pigment Red 22 |
| C.I. Constitution Number | 12370 |
| CAS 登记号 | 6410-34-0 |
| Chemical Class | Monoazo |
| Color Shade | Yellowish red |
| Molecular Structure | Azo naphthol type — transparency-optimized grade |
| 外观 | Red powder |
Technical Specifications
| Parameter | Typical Value |
|---|---|
| Tinting Strength | ≥ 100% (relative to standard) |
| 耐光性（全色） | 3–4（蓝色羊毛色卡） |
| Heat Resistance | 最高可达170°C（短期） |
| 吸油 | 38–48 g/100g |
| Specific Gravity | 1.32–1.44 g/cm³ |
| 堆积密度 | 0.32–0.50 g/cm³ |
| pH of Aqueous Suspension | 6.0–7.5 |
| 筛上残留物（45μm） | ≤ 0.8% |
| Moisture Content | ≤ 1.5% |
| Transparency (Drawdown) | 高 |
How to Interpret These Values
The high transparency rating is the defining characteristic of Pigment Red 22. In drawdown tests, PR22 films allow underlying layers or substrate characteristics to show through clearly — a property that is exploited in four-color process printing to achieve accurate color reproduction through halftone dot structures.
Heat resistance up to 170°C covers the thermal demands of most printing processes including high-speed web offset and heat-set web applications. The low sieve residue (≤ 0.8%) indicates a well-controlled particle size that minimizes the risk of pinholes or surface defects in thin ink films.
Key Applications
- 四色印刷： High transparency makes PR22 ideal for CMYK process work where clean color separation and accurate overprint reproduction are critical.
- Transparent Overprint Varnishes:可用于为叠印涂层着色，同时保持基材可见性和印刷光泽度。
- 多色光刻： Excellent for multi-color offset work where pigment transparency ensures clean ink trapping.
- Publication Gravure: Delivers consistent color density and smooth tonal gradation in high-speed publication printing.
- 水性柔版油墨：细粒径确保在纸张和纸板基材上分散顺畅、性能可靠。
Important Notes
While Pigment Red 22 shares the same C.I. Constitution Number (12370) as Pigment Red 21, the two grades are processed differently to achieve distinct performance profiles. PR22 is specifically optimized for transparency, while PR21 emphasizes dispersibility and flow. Selecting between them should be based on your application's priority: transparency-driven process work favors PR22; high-speed dispersion requirements may favor PR21.
For best results in water-based systems, we recommend pre-wetting PR22 with a compatible co-solvent or dispersing agent before full incorporation. This ensures optimal de-agglomeration and long-term dispersion stability.
Packaging & Storage
Starwin Red 22 is available in 25 kg paper/PE composite bags for standard orders, and in 500 kg or 1000 kg bulk bags for large-scale production facilities. Packaging is designed to protect the product from moisture ingress during transit and storage. Keep in a cool, dry location away from direct sunlight. Under proper storage conditions, the product maintains its specifications for a minimum of 3 years from the date of manufacture.
FAQ
Why choose PR22 over PR21 if they share the same C.I. number?
尽管两种颜料都共用 C.I. 12370，但其加工工艺不同。PR22 针对高透明度进行了优化——这是工艺色印刷的关键；而 PR21 则侧重于分散性和流动性，适用于通用场景。请根据您的主要应用需求进行选择。
What is the typical particle size of PR22?
The average primary particle size of PR22 typically falls in the range of 0.05–0.15 micrometers, contributing to its high transparency and smooth ink film formation. Specific particle size distribution data is available upon request.
Can PR22 be used in plastic applications?
PR22 can be used in certain plastic coloration applications, particularly in polyolefins and PVC where processing temperatures remain below 170°C. However, for engineering plastics requiring higher heat resistance, we recommend our high-performance pigment grades.
Why Choose Us
Hangzhou Starwin Tech Co., Ltd. has established itself as a trusted supplier of high-quality organic pigments for the global printing ink and coatings industry. Our Pigment Red 22 is produced with meticulous attention to particle size control and surface treatment, ensuring the transparency and color purity that process printers demand. Every batch undergoes comprehensive testing — including color strength, transparency drawdowns, light fastness, and dispersion characterization — before release. We back our products with responsive technical support, competitive pricing, and a commitment to on-time delivery that keeps your production running smoothly.
Contact Us
是否准备为您的应用评估 Starwin Red 22？请联系杭州星威科技有限公司获取产品样品、详细技术参数或批量报价。我们的颜料应用专家可提供配方建议与颜色匹配支持。我们承诺在 24 小时内回复所有咨询，并提供灵活的样品配送方案。
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