Pigment Red 9 (Starwin Red 9)

Product Overview

颜料红 9，其 CAS 编号为 6410-26-4，C.I. 编号为 12460，是偶氮色料家族中经典的单偶氮有机颜料。它呈现出鲜明的黄红色调，以其温暖感和在印刷材料中的视觉冲击力而著称。作为单偶氮系列的基础红色颜料之一，PR9 凭借其可靠性能和成本效益，数十年来被印刷油墨行业广泛采用。

Manufactured by Hangzhou Starwin Tech Co., Ltd., Starwin Red 9 is engineered for high tinting strength and excellent dispersibility in both solvent-based and water-based ink systems. Its molecular structure — built around a single azo chromophore linkage — delivers strong color saturation with good transparency, making it ideal for process printing where color fidelity and ink film uniformity are paramount.

Key Identification

Property	价值
C.I. Generic Name	Pigment Red 9
C.I. Constitution Number	12460
CAS 登记号	6410-26-4
Chemical Class	Monoazo
Color Shade	Yellowish red
Molecular Structure	Single azo group (–N=N–) coupled with naphthol derivative
外观	Red powder

Technical Specifications

Parameter	Typical Value
Tinting Strength	≥ 100% (relative to standard)
耐光性（全色）	4–5（蓝色羊毛色卡）
Heat Resistance	最高可达180°C（短期）
吸油	35–45 g/100g
Specific Gravity	1.35–1.45 g/cm³
堆积密度	0.35–0.50 g/cm³
pH of Aqueous Suspension	6.5–8.0
筛上残留物（45μm）	≤ 1.0%
Moisture Content	≤ 1.5%

How to Interpret These Values

The tinting strength of Pigment Red 9 is measured against an industry standard reference, ensuring that each batch delivers consistent coloring power. A light fastness rating of 4–5 on the Blue Wool Scale indicates good resistance to fading under normal indoor lighting conditions, suitable for packaging and short-to-medium-term outdoor applications.

The heat resistance specification of up to 180°C covers most conventional printing and coating processes. For applications requiring higher thermal stability, we recommend consulting our technical team for alternative grades or formulation adjustments.

Key Applications

• 胶印油墨：在包装、标签和商业印刷的胶印及轮转印刷系统中表现卓越。
• Flexographic Inks:适用于瓦楞包装和柔性薄膜印刷中常用的水性及醇性柔版油墨。
• Gravure Inks: Provides strong color density and good transparency for publication and packaging gravure applications.
• Water-Based Coatings: Compatible with aqueous coating formulations for paper and board substrates.
• 塑料着色：适用于对耐热性要求中等的特定塑料应用。

Important Notes

耐晒红9具有良好的透明度，特别适用于胶印和上光油印刷。但需注意，其耐光性虽满足室内及短期户外使用需求，若无额外紫外线防护，长期户外应用可能不足。

分散 PR9 于水性体系时，请确保调节 pH 值至 6.5–8.0 范围，并考虑使用分散剂以优化粒径分布。在批量生产前，应通过小试验证其与特定树脂体系的相容性。

Packaging & Storage

Starwin Red 9 采用带聚乙烯内衬的25公斤多层牛皮纸袋包装，也可根据需求提供500公斤/1000公斤散装袋（大袋）。请存放于阴凉、干燥、通风良好处，避免阳光直射和受潮。妥善保存条件下，产品自生产之日起至少3年内符合规格要求。请始终遵守当地处理与处置规定。

FAQ

What is the difference between Pigment Red 9 and Pigment Red 21?

Both PR9 and PR21 share the same C.I. Constitution Number (12460 vs 12370) and produce yellowish red shades, but they differ in molecular structure and specific application performance. PR9 generally offers higher tinting strength, while PR21 may provide better dispersibility in certain ink systems. We recommend testing both grades for your specific application.

Is Pigment Red 9 suitable for food packaging?

Standard grades of PR9 are not certified for direct food contact applications. For food packaging use, please inquire about our food-compliant grades that meet relevant regulatory standards (e.g., EU 10/2011, FDA 21 CFR).

Can PR9 be used in UV-curable ink systems?

Pigment Red 9 can be incorporated into UV-curable formulations, though dispersion optimization may be required. Contact our technical team for guidance on achieving optimal performance in UV systems.

Why Choose Us

杭州星文科技有限公司是一家专注于高性能有机颜料的生产与供应商。我们的 Pigment Red 9 在生产过程中严格执行质量控制标准，确保每批产品在颜色、粒径和性能上保持一致。凭借多年服务油墨及涂料行业的经验，我们不仅提供产品，更提供全方位的技术支持——从配方建议到现场故障排查。我们对品质的承诺、具有竞争力的价格以及可靠的供应链，使我们成为亚洲乃至全球客户首选的颜料解决方案合作伙伴。

Contact Us

For technical data sheets, samples, bulk pricing, or formulation support, please contact our sales team at Hangzhou Starwin Tech Co., Ltd. We respond to all inquiries within 24 hours and can arrange sample shipments for evaluation. Visit our website or reach out directly — our technical specialists are ready to help you find the optimal pigment solution for your application.