Pigment RED SY-208
CI:Pigment Red 21
CAS Number: 6410-26-0
EINECS Number: 229-091-6
Molecular Formula: C₂₂H₁₈N₄O₄
Chemical Class: Monoazo (β-Naphthol)
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1.Typical Physical and Chemical Properties
Pigment RED SY-208
| Property | Typical Value / Description | Test Method |
| Colour Mass Tone | Medium to yellowish red | Visual comparison |
| Density (g/cm³) | ~1.45 – 1.55 | ISO 787-10 |
| Bulk Volume (l/kg) | ~1.8 – 2.5 | — |
| Oil Absorption (g/100g) | 40 – 55 | ASTM D281 |
| Specific Surface Area (m²/g) | 15 – 30 | BET method |
| pH Value (10% Aqueous Slurry) | 6.0 – 8.0 | ISO 787-9 |
| Water Content (%) | ≤ 1.5 | ISO 787-2 |
| Volatile Matter (%) | ≤ 2.0 | — |
2. Application Properties
| Property | Performance Rating | Comments |
| Lightfastness (Full Shade) | Fair to Moderate (3-4) | Not suitable for high-durability outdoor applications. |
| Weather Resistance | Poor | Not recommended for automotive or exterior coatings. |
| Heat Resistance (°C) | 140 – 160 | Stable for most plastic processing and baking enamels. |
| Migration Resistance | Good | Good in most common application media. |
| Acid Resistance | Fair | May be sensitive to strong acids. |
| Alkali Resistance | Poor | Not stable in alkaline environments. |
| Solvent Resistance | Fair to Good | Resistant to aliphatic hydrocarbons; may bleed in some polar solvents (alcohols, esters, ketones). |
*(Note: Performance ratings are on a 1-5 scale, where 5 is excellent.)*
3. Recommended Applications
Due to its cost-effectiveness and bright red shade, PR21 is widely used in:
Industrial Paints & Coatings: Air-drying systems, primers.
Printing Inks: Especially for packaging inks and other applications where high lightfastness is not critical.
Plastics: Coloring of PVC, LDPE, and other polymers processed at moderate temperatures.
Office & Stationery Products: Inks, toners, and colored pencils.
Textile Printing.
Latex Emulsions.
Question 1: Who are we?
Our headquarters is located in Qingdao, Shandong Province, China. We started operations in 2008 and our products are sold to East Asia (15.00%), Eastern Europe (10.00%), domestic market (5.00%), South Asia (5.00%), Southern Europe (5.00%), Northern Europe (5.00%), Central America (5.00%), Western Europe (5.00%), North America (5.00%), Middle East (5.00%), Oceania (5.00%), Africa (5.00%), Southeast Asia (5.00%), South America (5.00%).
Question 2: How can we ensure quality?
Before large-scale production, a pre-production sample is always made;
Final inspection must be conducted before shipment;
Question 3: What products can you provide for us?
Resin, curing agent, pigment, color paste
Question 4: What services can we provide?
Accepted delivery terms: FOB, CFR, CIF, EXW, express delivery;
Accepted payment currencies: US dollars, euros, RMB
Accepted payment methods: wire transfer, cash;
Used languages: English, Chinese, Spanish, Japanese, Portuguese, German, Arabic, French, Russian, Korean, Italian
Question 5: What is the packaging price?
The exact price will depend on your purchase quantity. We can offer you the most favorable price.
Question 6: How can we obtain samples and what is the cost?
Regarding samples: They are free. You only need to pay for the shipping cost. For custom samples, we can design them according to your information and requirements. The production time of the samples is approximately 3 to 5 days.
Question 6: What is your payment method?
You can use methods such as TT/PAYPAL. For small transactions below $1000, we prefer 100% advance payment. For larger transactions, we require a 80% deposit to be paid before shipment.
Question 8: How can we pick up the goods from your factory?
You can choose air freight or sea freight. If the quantity is small (total packaging volume is less than 1 cubic meter), we recommend air freight, which takes approximately 5 to 7 days. If the quantity is large, we recommend sea freight. It takes approximately 20 to 30 days. If you have your own freight agent to handle the transportation, it will be more convenient. If not, we have professional freight agents who can provide assistance for you.
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