Pigment Red 3 (Starwin Red 3)

Product Overview

Pigment Red 3, also known as PO.Tolu Red, 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, PR3 is commonly used in offset printing inks, water-based inks, interior coatings, and plastic coloring.

Starwin Red 3商业级耐晒红3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)	PO.Tolu Red
Commercial Name	星红 3
C.I. Name	Pigment Red 3
客户编号	12120
CAS 编号	2425-85-6
EC No.	219-381-8
Molecular Formula	C₁₇H₁₃N₃O₂
分子量	279.30 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 3. 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	Offset inks, water-based inks, interior coatings, plastics
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: PR3 provides bright yellowish red coloration in sheet-fed and web offset ink systems for commercial and packaging printing.
• Water-Based Inks: Widely used in water-based flexographic and gravure ink formulations.
• 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 and industrial rubber goods.

4. Other Applications

• 纺织品印花: Used in pigment printing pastes for textile applications.
• 文具墨水: Suitable for writing and drawing ink formulations.

重要提示：

• 颜料红 3 是classic monoazo pigment valued for its yellowish red hue and good color strength at a competitive price point.
• 它是mainly recommended for offset printing inks, water-based inks, and interior coatings.
• The pigment has limited weather fastness and migration resistance — not recommended for long-term exterior exposure or soft PVC applications.
• PR3 is coloristically similar to PR2 and PR4 but differs in molecular structure and specific performance 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 3?

Pigment Red 3 (PR3), also known as PO.Tolu Red, is a monoazo organic pigment with C.I. number 12120 and CAS number 2425-85-6. 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 3 and Pigment Red 2?

Both are monoazo yellowish red pigments with similar performance profiles:

Property	PR3	PR2
CAS 编号	2425-85-6	6410-15-7
客户编号	12120	12310
Heat Resistance	最高150°C	最高160°C
耐光性（全）	4 级 – 5	4 级 – 5
Primary Use	Offset inks, water-based inks	Inks, interior coatings, rubber

PR2 offers slightly better heat resistance, while PR3 has better solvent resistance. Both are cost-effective choices for general-purpose applications.

Is Pigment Red 3 suitable for outdoor applications?

PR3 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 3 suitable for high-temperature plastics?

PR3 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 3 Supplier?

• Consistent Quality: Every batch of Starwin Red 3 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 3（颜料红 3，CAS 2425-85-6），请联系我们的团队。

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