Pigment Red 5 (Starwin Red 5)

Product Overview

Pigment Red 5, also known as Toluidine Red BN, is a monoazo organic pigment belonging to the β-naphthol azo chemical class. It features a yellowish red hue with good color strength and reliable performance in general-purpose applications. With moderate heat resistance up to 150°C and light fastness of Grade 4–5, PR5 is commonly used in printing inks, coatings, plastics, and rubber products.

Starwin Red 5商业级耐晒红5由杭州星威科技有限公司供应。该产品制造精良，确保色力稳定、色泽均匀，并实现批次间高度一致的可重复性。

Key Identification

Property	价值
Product Name (EN)	Toluidine Red BN
Commercial Name	星红 5
C.I. Name	Pigment Red 5
客户编号	12085
CAS 编号	6410-20-8
EC No.	229-075-7
Molecular Formula	C₁₇H₁₃N₃O₃
分子量	295.30 g/mol
Chemical Class	Monoazo (β-Naphthol type)
外观	Red powder
Color Shade	Yellowish red

Technical Specifications

The following data represents typical performance properties of Starwin Red 5. Actual values may vary slightly by batch — please refer to the Certificate of Analysis (COA) and Technical Data Sheet (TDS) for each shipment.

Parameter	规格
纯净	≥95.0%
Moisture	≤1.5%
pH 值	6.5 – 8.0
吸油	40 – 55 g/100g
Density	1.35 – 1.55 g/cm³
Heat Resistance	最高150°C
耐光性（全色）	4 级 – 5
耐光性 (1/3 标准)	3 级 – 4
Weather Fastness (Full Shade)	2 级 – 3
Migration Resistance (PVC)	2 级 – 3
Acid Resistance	3 级 – 4
耐碱性	4 年级
Solvent Resistance	Good
Key Applications	Printing inks, coatings, plastics, rubber
Packaging	25kg/bag 带内衬 PE
Storage	存放于阴凉、干燥、通风处，避免阳光直射
HS Code	32041700

How to Interpret These Specifications

• 耐光性（4–5 全色）: Moderate. Suitable for indoor and short-term outdoor applications. For long-term exterior exposure, consider higher-performance alternatives such as PR48:2 or PR57:1.
• 耐热性（最高 150°C）: Moderate. Suitable for standard plastic processing temperatures but not recommended for high-temperature engineering plastics.
• 耐光性（2–3 全遮光）: Limited. Not recommended for long-term outdoor exposure without overcoat protection.
• Migration Resistance (PVC Grade 2–3): Fair. May exhibit some migration in soft PVC. Verify compatibility with your specific formulation.
• Acid/Alkali Resistance: Good alkali resistance (Grade 4) but moderate acid resistance (Grade 3–4). Suitable for most standard formulation environments.

Key Applications

1. Printing Inks (Primary Application)

• Offset Inks: PR5 provides bright yellowish red coloration in sheet-fed and web offset ink systems.
• Water-Based Inks: Used in water-based flexographic and gravure ink formulations for packaging and label printing.
• Gravure Inks: Suitable for solvent-based gravure printing on various substrates.

2. Coatings

• Interior Coatings：适用于室内装饰和工业涂层，对耐光性要求不高的场合。
• General-Purpose Paints：用于非高要求场景中的经济型涂料配方。

3. Plastics & Rubber

• PVC: Suitable for rigid PVC applications where migration is less of a concern.
• PE & PP: Can be used in polyolefin coloring at processing temperatures below 150°C.
• 橡胶制品: Used as a colorant in rubber compounding for footwear, gaskets, and industrial rubber goods.

4. Other Applications

• 纺织品印花: Used in pigment printing pastes for textile applications.
• Leather Finishing: Used in leather coating formulations for coloration.

重要提示：

• 颜料红 5 是classic monoazo pigment valued for its yellowish red hue and good color strength at a competitive price point.
• 它是主要适用于印刷油墨、内涂覆层及通用塑料/橡胶着色。.
• The pigment has limited weather fastness and migration resistance — not recommended for long-term exterior exposure or soft PVC applications.
• PR5 shares the same C.I. number as PR4 (12085) but has a different CAS number, indicating a different polymorphic form with potentially different dispersion characteristics.

Packaging & Storage

• Packaging：25kg/bag，带内衬 PE 层。可按需提供定制包装。
• Storage存放于阴凉、干燥且通风良好的地方，避免阳光直射和热源。防止受潮——不使用时请保持袋口密封。保质期：在适当储存条件下，自生产之日起 24 个月。
• Transportation：不属于联合国运输规章规定的危险品。请小心搬运，避免行李破损。

Frequently Asked Questions (FAQ)

What is Pigment Red 5?

Pigment Red 5 (PR5), also known as Toluidine Red BN, is a monoazo organic pigment with C.I. number 12085 and CAS number 6410-20-8. It belongs to the β-naphthol azo chemical class and features a yellowish red hue with moderate heat resistance (up to 150°C) and light fastness (Grade 4–5).

What is the difference between Pigment Red 5 and Pigment Red 4?

Both share the same C.I. number (12085) but have different CAS numbers, indicating different crystalline or polymorphic forms:

Property	PR5	PR4
CAS 编号	6410-20-8	6410-19-1
客户编号	12085	12085
Heat Resistance	最高150°C	最高150°C
耐光性（全）	4 级 – 5	4 级 – 5
Primary Use	Inks, coatings, plastics	Inks, coatings, rubber

PR5 and PR4 have similar performance profiles but may differ in specific dispersion characteristics and hue nuances. Selection depends on your specific formulation requirements.

Is Pigment Red 5 suitable for outdoor applications?

PR5 has limited weather fastness (Grade 2–3 full shade) and is best suited for interior or short-term outdoor applications. For long-term exterior exposure, consider higher-performance alternatives such as Pigment Red 48:2 or Pigment Red 57:1.

Is Pigment Red 5 suitable for high-temperature plastics?

PR5 has heat resistance up to 150°C, which is suitable for most standard plastic processing but not for high-temperature engineering plastics. For applications requiring heat resistance above 200°C, consider benzimidazolone or perylene reds.

Do you provide samples, COA, and SDS?

是的，杭州星赢科技有限公司提供样品供评估，每批货物均附带COA和SDS。

Why Choose Hangzhou Starwin Tech Co., Ltd. as Your Pigment Red 5 Supplier?

• Consistent Quality: Every batch of Starwin Red 5 is tested for color strength, hue, purity, moisture, and physical properties.
• Technical Support: Our team can assist with formulation guidance, dispersion recommendations, and application-specific troubleshooting.
• 可靠供应: Stable production capacity and export experience serving customers across Asia, Europe, and the Americas.
• 竞争性定价: Direct from manufacturer, with flexible MOQ options for trial orders.

Contact Us

杭州星威科技有限公司

For technical data sheets (TDS), safety data sheets (SDS), samples, or pricing inquiries regarding Starwin 红 5（颜料红 5，CAS 6410-20-8），请联系我们的团队。

We welcome both small-scale trial orders and long-term supply partnerships.