颜料红 48:1（星红 48:1）

密钥标识

Property	价值
C.I. Generic Name	颜料红 48:1
C.I. Constitution Number	15865:1
CAS 登记号	7023-61-4
化学类别	Monoazo (Naphthol AS lake — Barium salt)
Color Shade	蓝红色
Molecular Structure	Naphthol AS derivative, laked with barium salt
外观	Deep red-blue powder

产品概览

Pigment Red 48:1 occupies a distinguished position in the Monoazo pigment family as a Naphthol AS-type lake pigment. Unlike simple monoazo reds, PR48:1 is produced by laking a substituted naphthol sulfonic acid with a barium salt — a process that fundamentally enhances the pigment's permanence properties including light fastness, solvent resistance, and overcoating stability.

The result is a deep, cool bluish red pigment with exceptional tinting strength and opacity — qualities that make it a preferred choice for applications where color richness and durability must coexist. Starwin Red 48:1, manufactured by Hangzhou Starwin Tech Co., Ltd., is produced under controlled laking conditions that ensure consistent crystal structure, particle size, and performance from batch to batch.

Technical Specifications

Parameter	Typical Value
Tinting Strength	≥ 105% (relative to standard)
Light Fastness (Full Shade)	5–6（蓝色羊毛色卡）
Heat Resistance	最高可达220°C（短期）
吸油	40–55 克/100 克
比重	1.50–1.65 g/cm³
堆积密度	0.40–0.55 g/cm³
pH of Aqueous Suspension	7.0–9.0
筛上残留物（45μm）	≤ 0.5%
含水量	≤ 1.0%
耐溶剂性	Good (minimal bleeding in most solvents)

How to Interpret These Values

The light fastness rating of 5–6 on the Blue Wool Scale is notably higher than simple monoazo reds (typically 3–4), reflecting the permanence advantage conferred by the lake structure. This makes PR48:1 suitable for applications requiring longer color retention, including premium packaging and outdoor signage with moderate exposure.

Heat resistance up to 220°C significantly exceeds that of non-laked monoazo pigments, opening the door to heat-set web offset, some plastic coloration applications, and industrial coating processes that demand higher thermal stability. The good solvent resistance means the pigment will not bleed or migrate when overcoated or exposed to common solvents.

关键应用领域

• Premium Offset Inks: High tinting strength and excellent opacity deliver rich, opaque red impressions for luxury packaging, labels, and commercial printing.
• Letterpress Inks: Traditional application where PR48:1's strong masstone and good transfer properties are fully utilized.
• 热熔固定卷筒胶印： Heat resistance up to 220°C allows use in high-speed heat-set web printing for magazines and catalogs.
• 工业涂料： Good solvent and chemical resistance make it suitable for decorative and protective coating formulations.
• 塑料着色： Can be used in PVC, polyolefins, and select engineering plastics where processing temperatures remain within limits.
• Rubber Applications: Suitable for coloring rubber products where good light fastness and color strength are needed.

重要提示

Pigment Red 48:1 is part of the PR48 series, which includes several metal salt variants (PR48:1 = Barium salt, PR48:2 = Manganese salt, PR48:3 = Calcium salt, PR48:4 = Strontium salt). Each variant offers slightly different shade, heat resistance, and fastness properties. PR48:1 with its barium laking provides the best balance of bluish red shade, high tinting strength, and good all-round fastness among the series.

Due to its higher specific gravity compared to simple monoazo pigments, PR48:1 may settle more readily in low-viscosity ink vehicles. Formulators should consider appropriate rheology modifiers or thixotropic agents to maintain suspension stability in storage.

Packaging & Storage

Starwin Red 48:1 is supplied in 25 kg multi-wall paper bags with polyethylene inner liners, or in 500 kg / 1000 kg bulk bags for high-volume users. The packaging is designed to prevent moisture absorption during storage and transit. Store in a cool, dry, well-ventilated area, away from direct sunlight and incompatible materials. Under proper conditions, the product maintains its specifications for a minimum of 3 years from the production date.

FAQ

What is the difference between PR48:1 and PR48:2?

The primary difference lies in the metal salt used for laking: PR48:1 uses barium, while PR48:2 uses manganese. PR48:1 (Barium) offers a cleaner bluish red with slightly higher tinting strength, while PR48:2 (Manganese) provides marginally better heat resistance and a slightly darker, more maroon shade. Both share good light fastness and solvent resistance.

Is PR48:1 suitable for food contact applications?

Standard grades of PR48:1 are not certified for direct food contact. For food packaging or food-contact articles, please inquire about our specialty grades that comply with relevant food-contact regulations (EU 10/2011, FDA 21 CFR, etc.).

How does PR48:1 compare to disazo reds in terms of opacity?

PR48:1 offers excellent opacity for a monoazo pigment, approaching the covering power of many disazo reds. However, disazo pigments generally provide superior heat resistance and light fastness. The choice depends on your specific balance of opacity, fastness, and cost requirements.

为何选择我们

Hangzhou Starwin Tech Co., Ltd. is a specialist manufacturer of high-performance organic pigments, with Pigment Red 48:1 representing one of our flagship products. Our laking process is precisely controlled to ensure optimal crystal form, particle size distribution, and surface characteristics — factors that directly influence tinting strength, opacity, and dispersion behavior. Every production batch is tested against strict internal standards for color, fastness, and application performance before release. We combine technical excellence with responsive customer service, competitive pricing, and reliable supply chain management to support your production needs consistently.

Contact Us

For samples, technical data sheets, safety data sheets, or volume quotations for Starwin Red 48:1, please contact our sales team at Hangzhou Starwin Tech Co., Ltd. Our application engineers are available to assist with formulation recommendations, color matching, and troubleshooting. We respond to all inquiries within 24 hours and can arrange sample delivery within 3–5 business days.