Shandong Zhongyang Chemical Co., Ltd.
Pigment red 21
Classification :
PRODUCT DETAILS
Pigment Red 21
Aliases: Lightfast Red 2R, 3132 Red Powder, Red Powder
C.I. No.: 12300
CAS No.: 6410-26-0
Basic Information
Chemical Class: Monoazo organic pigment (Azo-S series)
Molecular Formula: C₂₃H₁₆ClN₃O₂
Molecular Weight: 401.85
Appearance: Bright yellowish-red powder with vivid and rich color
Hue: Typical yellowish-red, warm-toned with a distinct yellow cast; high opacity
Physical and Chemical Properties
Melting Point: 241°C
Relative Density: 1.31
Average Particle Size: Approximately 100–200 nm (Standard Grade)
Specific Surface Area: Approximately 44 m²/g
Oil Absorption: 35–45 g/100 g (Standard 40±5)
pH (10% slurry): Neutral to slightly alkaline
Solubility: Insoluble in water; slightly soluble in ethanol and toluene; exhibits a blue-red color in concentrated sulfuric acid; forms a yellow-red precipitate upon dilution
Hiding power: High opacity
Performance Characteristics
Tinting strength: High, with tinting intensity reaching 95%–105% of the standard sample; highly economical
Lightfastness: Excellent, standard shade depth 6–7, outstanding indoor durability
Heat resistance: Stable at 130–140°C, withstands up to approximately 150°C, suitable for conventional processing
Solvent resistance / Migration resistance: Good resistance to water, paraffin, and ethanol (Grade 4–5); moderate resistance to oil and toluene (Grade 3); prone to migration in soft PVC
Acid and Alkali Resistance: Acid resistance Grade 5, alkali resistance Grade 5; excellent chemical stability
Dispersibility: Excellent; disperses easily in water-based and oil-based systems; suitable for color pastes, inks, and coatings
Major Applications
Coatings: Primary application; red enamel paint, interior latex paint, industrial paint, wood finish; high opacity, good lightfastness
Inks: Offset printing, gravure printing, water-based inks, stamp pads, and ink sticks; produces vivid colors
Stationery and Educational Supplies: Watercolors, oil paints, crayons, markers, and wall paints
Other: Leather, rubber, latex products, soap, cosmetics, and fabric printing; limited use in plastics (due to heat resistance and migration limitations)
Factory Description
Equipped with advanced equipment and precise detection technology, and supported by sufficient capital, the company provides customers with high-quality optical brighteners and pigment products, and customizes exclusive product solutions according to customer needs. Covering an area of more than 2,000 mu, the company has built a number of standardized production workshops and professional laboratories. Based on complete experimental facilities, it can provide customers with accurate application data support, and ensure stable goods supply with large-scale production capacity.
Our Advantages
1. With our own manufacturing facilities, R&D center, and laboratories, we ensure consistent and reliable quality for products including optical brightening agents, titanium dioxide, solvent dyes, and pigments.
2. We provide OBA products and comprehensive whitening solutions with full technical support throughout the process.
3. Factory direct sales offer prices 3%-5% lower than market rates.
4. Rapid delivery with same-day shipping available.
5. Custom packaging options for optical brighteners, titanium dioxide, solvent dyes, pigments, and more based on client requirements.
6. Complimentary samples provided for testing comparative effects and cost-effectiveness.
7. Prompt response to inquiries with professional and efficient service.
8. Flexible payment options including TT, LC, and other settlement methods.
9. Complete customs clearance documentation backed by years of export experience.
10. DDP door-to-door service with real-time tracking of logistics updates.
Package information
Standard packaging is 25 kg in cardboard drums, cartons, or bags lined with double-layer PE film. Customized packaging is also available upon customer request.
Transportation and storage
Transportation: Fluorescent whitening agents should be protected from impact and direct sunlight during transportation.
Storage: Store in a cool, dry, and well-ventilated warehouse. Shelf life is two years.
FAQ
Q: Are your products suitable for use in synthetic fibers, plastics, detergents, coatings, inks, textiles, and paper?
Q: How about after-sales service?
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Q: Can you ship to Southeast Asia and Africa?
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Q: How long is the lead time?
Q: What payment terms do you accept？
Q: What is your standard packaging?
Q: Can you provide samples?
Q: What is your MOQ?
Q: Are prices negotiable?
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Qihe Economic Development Zone (Industrial Park), Shandong Province