Pigment Red 208 (Starwin Red 208)

产品概览

Starwin Red 208 (Pigment Red 208) is a vibrant Naphthol AS-type monoazo pigment with C.I. designation 71145 and CAS number 6842-68-8. Within the Naphthol Red family, PR208 occupies a distinctive position with its clean blue-red shade that combines the depth expected from this chemical class with exceptional brightness and saturation.

This pigment is the result of advanced particle engineering — its controlled crystal morphology and optimized particle size distribution deliver maximum color development with efficient dispersion energy. The surface chemistry has been tailored for compatibility with modern solvent-based and energy-curable ink systems.

密钥标识

Property	价值
C.I. Generic Name	Pigment Red 208
客户编号	71145
CAS Number	6842-68-8
化学类别	萘酚红（Naphthol AS 型单偶氮染料）
Molecular Formula	C₂₄H₂₀ClN₃O₄
分子量	449.89 g/mol
色度	Vibrant Blue-Red

Technical Specifications

Parameter	规格
Lightfastness (Blue Wool Scale)	6–7
耐热性	最高230°C
吸油	36–46 ml/100g
堆积密度	0.44–0.54 g/cm³
平均粒径	0.14–0.24 微米
pH 值（水悬浮液）	6.5–8.0
水溶性	< 0.3 g/L
Volatiles at 105°C	< 0.8%

How to Interpret These Values

PR208's particle size distribution (0.14–0.24 μm) is engineered to balance color strength with dispersion ease — the particles are large enough to avoid the excessive oil absorption of ultra-fine grades, yet small enough to deliver the high tinctorial power expected from Naphthol pigments. The 230°C heat resistance covers the vast majority of plastic processing operations, including PE, PP, PS, and ABS molding and extrusion. In ink applications, this thermal margin ensures stability during high-speed press running where friction-generated heat can raise ink film temperatures.

关键应用领域

• Flexographic Packaging Inks: High-quality flexo inks for flexible packaging, labels, and shrink sleeves where clean blue-red shade and good press stability are required.
• Gravure Inks: Solvent-based gravure inks for decorative printing, laminates, and premium packaging.
• Decorative Laminates: Printing inks for high-pressure and low-pressure decorative laminates used in furniture and interior design.
• Metal Decoration: Offset and screen printing inks for cans, closures, and decorative tins.
• Wood Coatings: Pigmented stain and opaque coating systems for furniture, cabinetry, and interior woodwork.

重要提示

PR208 shows excellent stability in solvent-based systems but may require additional dispersant in water-based formulations to achieve optimal gloss and color development. When used in plastic applications, the pigment performs best at concentrations above 1% — at very low let-downs, some shade shift toward yellow may occur. For UV-curable systems, evaluate cure speed with your specific photoinitiator package, as the pigment's absorption characteristics may require adjusted lamp settings. Not recommended for direct food contact applications without specific certification.

Packaging & Storage

Standard packaging: 25 kg bags (multi-wall kraft paper with PE inner liner) or 500 kg bulk bags. Store in original, sealed packaging in a dry, well-ventilated area protected from direct sunlight and temperature extremes. Recommended storage conditions: 5–35°C, relative humidity below 70%. Under these conditions, the product maintains full specification compliance for at least 3 years from the manufacturing date. Once opened, reseal bags promptly and use within 12 months for best results.

Frequently Asked Questions

What shade difference exists between PR208 and PR170?

PR208 has a cleaner, more saturated blue-red shade compared to PR170, which tends toward a slightly darker, more traditional red. PR208 is preferred when brightness and visual impact are priorities.

Can PR208 be used in water-based flexo inks?

Yes, but water-based systems typically require 2–4% polymeric dispersant (based on pigment weight) and pH adjustment to 8.0–9.0 for optimal dispersion stability and gloss development. Pre-dispersion in a glycol co-solvent improves incorporation efficiency.

Is PR208 compatible with UV-curable inks?

PR208 disperses well in UV-curable vehicles. Its absorption maximum is in the red region, so it does not significantly interfere with common photoinitiators that absorb in the UV range. However, high pigment loading may require increased UV dose for through-cure.

Why Choose Starwin

Hangzhou Starwin Tech Co., Ltd. produces Pigment Red 208 with proprietary crystal modification technology that ensures consistent shade, high color strength, and reliable dispersion performance. Our quality management system (ISO 9001) governs every step from raw material sourcing to finished product testing. Each batch is tested for colorimetric values (L*a*b*), particle size distribution, oil absorption, and application performance in standard formulations before release. We offer responsive technical support and can develop custom grades to meet specific application requirements.

联系我们

For Pigment Red 208 samples, technical data, or bulk quotations, contact the sales team at Hangzhou Starwin Tech Co., Ltd. We are committed to fast response times and reliable supply chain performance.