
Product Name: Solvent Blue 45 / Solvent Blue RLS / Savinyl Blue RS
Chemical Name: Anthraquinone-based Solvent Dye / 1,4-Bis(alkylamino)anthraquinone derivative
Color Index: C.I. 61580
CAS: 37229-23-5 (primary); 37299-23-5 (alternative)
Molecular Formula: Variable (Anthraquinone complex)
Formula Weight: 350-450 g/mol (depending on formulation)
Synonyms: Solvent Blue RLS; Savinyl Blue RS; C.I. 61580; Solvent Blue 45; Anthraquinone Blue; Transparent Blue S-RLS
Application:
Printing Inks (Gravure, Flexographic), Wood Stains & Coatings, Plastics (PS, ABS, PC, PET, PMMA, SAN), Leather Finishes, Stationery & Writing Inks, Aluminum Foil & Metal Packaging, Low-Temperature Baking Paints, Candle Coloring, Gasoline & Oil Marking
1.Product Description
Achieve Brilliant, Polar-Soluble Blue Coloration with Solvent Blue 45 – The Premium Anthraquinone Dye for Inks, Coatings, and Plastics.
Solvent Blue 45, designated as C.I. 61580 and widely known as Solvent Blue RLS or Savinyl Blue RS, is a high-performance anthraquinone-based solvent dye renowned for its excellent solubility in polar organic solvents, brilliant blue shade, and outstanding overall fastness properties . This sophisticated dye features a stable anthraquinone molecular structure that delivers superior color strength and compatibility with polar solvent systems such as alcohols, ketones, and glycol ethers .
What distinguishes Solvent Blue 45 from conventional solvent dyes is its exceptional combination of solubility, fastness, and versatility. With excellent solubility in polar organic solvents and good resistance to acid and alkali (rated Grade 5), this dye maintains its vibrant color through demanding processing conditions . Its lightfastness rating of 7 (on an 8-point scale) ensures durable coloration in outdoor and prolonged-use applications . The dye's melting point stability extends to 200°C, making it suitable for a wide range of industrial applications .
Key differentiators:
Anthraquinone Chemistry: Provides superior thermal stability and lightfastness compared to azo-based alternatives .
Excellent Polar Solvent Solubility: Highly soluble in alcohols, ketones, glycol ethers, and polar organic solvents .
Outstanding Fastness Properties: Acid fastness Grade 5, Alkali fastness Grade 5, Lightfastness Grade 7 .
Brilliant Blue Shade: Delivers a clean, transparent blue hue with excellent color strength.
Broad Application Range: Suitable for printing inks, wood stains, plastics, leather finishes, and stationery .
2. Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Solvent Blue 45 (C.I. 61580) | Premium anthraquinone dye for polar solvent systems |
| Appearance | Dark blue to blue-black uniform powder | Free-flowing, fine powder |
| CAS No. | 37229-23-5 / 37299-23-5 | Verified chemical registry numbers |
| EINECS/EC No. | Not available in search results | Please contact manufacturer for regulatory information |
| Solubility (Water) | Insoluble | Hydrophobic, suitable for solvent-based systems |
| Solubility (Polar Solvents) | Excellent in alcohols, ketones, glycol ethers, DMSO | Ideal for polar solvent applications |
| Ionic Style | Non-ionic / Solvent Dye | Compatible with solvent-based systems |
| Color Shade | Brilliant blue | Transparent, vibrant blue |
| Tinting Strength | 100% ± 3% (vs. standard) | High color strength with consistent performance |
| Purity | ≥ 99% (industrial grade) | High purity ensures consistent batch-to-batch performance |
| Lightfastness | Grade 7 (1-8 scale) | Excellent UV resistance for durable coloration |
| Acid Fastness | Grade 5 | Excellent resistance to acidic conditions |
| Alkali Fastness | Grade 5 | Outstanding resistance to alkaline conditions |
| Heat Resistance | 200°C | Stable through processing |
| Moisture Content | ≤ 1% | Low moisture ensures stability |
| Fineness | Through 60-80 mesh sieve | Uniform particle size for dispersion |
| Storage Conditions | Store in cool, dry, ventilated warehouse; keep containers tightly sealed; protect from light | Shelf life: 3-5 years under proper storage |
| Packing | 25 kg fiber drums / cardboard cartons with PE inner liner; 1 kg, 5 kg research packs; custom sizes available | Secure, moisture-proof packaging |
| Application | Printing inks, wood stains, plastics, leather finishes, stationery, candles, paints | Versatile across multiple industries |
3.Product Application
| Ink Type | Recommended Dosage | Application Notes |
| Gravure Printing Inks | 3-10% of ink formulation | Excellent solubility in polar solvents; good transfer properties |
| Flexographic Inks | 3-8% of ink formulation | Compatible with alcohol and ketone solvent systems |
| Stationery & Writing Inks | 2-5% of ink formulation | Recommended for high-quality pens and markers |
| Aluminum Foil & Metal Packaging | 1-4% of coating | Excellent adhesion and gloss retention |
| Low-Temperature Baking Paints | 1-5% of formulation | Suitable for heat-sensitive substrates |
Printing Inks – Primary Application:
Solvent Blue 45 is the preferred colorant for high-performance printing inks, delivering deep blue coloration with excellent solubility and stability :
Wood Stains & Coatings:
Solvent Blue 45 is highly recommended for wood finishing applications :
Wood Stains: Provides deep, transparent blue coloration that enhances wood grain (highly recommended)
Wood Protection Coatings: Offers good durability and UV resistance
Furniture Finishes: Suitable for interior wood finishing applications
Plastics & Thermoplastics:
The dye's excellent heat stability and compatibility make it ideal for plastic coloration across a wide range of polymers :
| Polymer Substrate | Recommended Dosage | Processing Conditions |
| Polystyrene (PS) | 0.02-0.05% | Up to 240°C; transparent applications |
| ABS | 0.02-0.05% | Up to 250°C; good color development |
| Polycarbonate (PC) | 0.02-0.05% | Up to 280°C; high heat stability |
| PET / PETP | 0.02-0.05% | Suitable for bottle and film applications |
| PMMA (Acrylic) | 0.02-0.05% | Excellent clarity and weatherability |
| SAN / AS | 0.02-0.05% | Good compatibility with styrenic copolymers |
| Rigid PVC (UPVC) | 0.02-0.05% | Suitable for rigid plastic applications |
Leather Finishes:
Solvent Blue 45 is recommended for leather finishing applications :
Leather Finish: Provides uniform blue coloration with good coverage
Shoe Care Products: Suitable for coloring shoe polishes and creams
Candles & Waxes:
The dye is suitable for coloring wax-based products :
Candles: Recommended for decorative and colored candle applications
Waxes: Colors industrial and household wax products
Fuels & Oils:
Solvent Blue 45 can be used for coloring hydrocarbon products :
Gasoline & Fuels: Used as a marker dye for identification
Lubricants & Oils: Colors industrial and automotive oils
4.Our advantage:
1) Provide free samples for testing or comparing the effect difference and cost performance.
2) Fast response speed, customers' questions at any time will be responded to in two hours.
3) Fast delivery: the fastest delivery can be made on the same day.
4)Different packaging solutions: provide various packaging options according to customer requirements.
5)Technical guidance: provide improved whitening and coloring formulas and guidance according to customer production materials.
6) Sample retention or sample mailing before bulk delivery.
7) Providing certificationes, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.
5.Packing information:
Usually is 25Kg/cardboard drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements.