Solvent Green 28 / Solvent Dyes
Solvent Dyes
Technical Information
CAS No.:28198-05-2
Chemical Formula C34H34N2O4
Application: used for coloring for plastics, PS, ABS, PMMA, PC, PET, polymer, fiber, and polyester fiber.
Solvent Green 28 — Anthraquinone Brilliant Green Dye for Polyester Fiber and Transparent Thermoplastics
Solvent Green 28 (C.I. 625580, CAS 28198-05-2, C₃₄H₃₄N₂O₄) is an anthraquinone-class solvent dye engineered for polyester fiber spin-dyeing and transparent engineering plastic coloration. Its unique molecular structure combines a high molecular weight (534.6 g/mol) with balanced solubility characteristics, delivering a vivid bluish-green shade with exceptional brightness and clarity in amorphous polymers such as PS, PC, PMMA, and SAN. With heat resistance verified at 300°C for PS, PMMA, PC, and PA6, and 260–280°C for ABS, this dye covers the processing window of all major thermoplastics. The dye achieves Blue Wool light fastness 7–8 in PS and PMMA, making it suitable for interior applications where light exposure is a design factor. Compared to pigment-based green colorants (such as PG7 or PG36), Solvent Green 28 offers complete solubility — eliminating dispersion-related surface defects in high-clarity injection-molded parts — while providing comparable or superior transparency in PET bottle preforms and PC lighting applications.
Identification Information:
Product name: Solvent Green 28
Color Index No.: 625580
CAS No.:28198-05-2
EC NO.: 248-895-9
Physical Data:
| Appearance | Green powder |
| Tinting Strength | 100±2% |
| Shade Color | Similar to the standard, |
| Ash | ≤ 0.5% |
| Moisture | ≤ 1.0% |
| Color Differential ValueΔE | ≤ 1.0 |
| Bulk density (g /cm3): | 1.55 |
| Melting point (℃): | 210 |
Fastness Properties in Polymer:
| Test Items | PS | ABS | SAN | PMMA | PC | R-PVC | PA6 | PET |
| Heat resistance temperature, ℃
(0.05% dyes + 1.0% Titanium dioxide) |
300 | 260-280 | 300 | 300 | – | 300 | -280 | |
| Migration resistance | – | – | – | – | – | – | – | – |
| Light fastness (0.05% dyes, transparent) | 7-8 | 7-8 | 7-8 | |||||
| Weather resistance | – | – | – | – | – | – | – | 5 |
| Acid resistance (in 5% hydrochloric acid solution) | – | – | – | – | – | 5 | – | – |
| Alkali resistance (in 5% caustic soda solution) | – | – | – | – | – | 5 | – | – |
Solvent Green 28 solubility in organic solvent at 20℃(g/l)
| Acetone | Butyl Acetate | Methylbenzene | Dichloromethane | Ethylalcohol |
| 2.0 | 4.5 | – | 50 | 0.1 |
Application
| PS | ● | HIPS | ● | ABS | ● |
| PC | ● | PVC-R | ● | PMMA | ● |
| SAN | ● | AS | ● | PA | – |
| PET | ● | CA | ● | CAB | ● |
Note: ● = recommended ○ = potential use – = not recommend
Recommended Dosage
Transparent: 0.03
Non-transparent: 0.05
Packaging:
Regular Packaging is in 25kgs carton box. 450kgs per pallet.
Technical Parameter Interpretation — Solvent Green 28
Heat Resistance (300°C PS/PMMA/PC/PA6; 260–280°C ABS): The tiered thermal profile reflects real-world polymer processing conditions. PS, PMMA, and PC typically process above 270°C — the 300°C rating confirms stability through the full melt-processing window. The 260–280°C range for ABS aligns with standard ABS injection molding temperatures (230–260°C), providing adequate safety margin. For ABS compounds processed at the upper end, consider reducing residence time to minimize thermal exposure.
Light Fastness 7–8 (PS/PMMA/PC): Achieving Blue Wool 7–8 in three major polymer systems demonstrates the anthraquinone chromophore’s inherent photostability. This rating is sufficient for indoor applications with indirect sunlight exposure and meets the interior automotive trim specification (typically ≥6 on Blue Wool scale). For direct outdoor use, additional UV stabilization of the polymer matrix is recommended.
Weather Resistance 5 (PET only): The weather resistance rating of 5 in PET — while moderate — is notable for a green solvent dye. In PET packaging applications (bottles, containers), this translates to acceptable color retention throughout the product lifecycle, though it should not be specified for long-term outdoor PET applications without UV absorber co-additives.
Acid/Alkali Resistance 5 (R-PVC): Both acid and alkali resistance ratings of 5 in R-PVC confirm chemical inertness under typical PVC compounding and end-use conditions. This stability is critical for PVC cable sheathing, profiles, and flooring where exposure to cleaning agents or environmental chemicals is expected.
Melting Point 210°C & Density 1.55 g/cm³: The moderate melting point combined with high bulk density indicates a crystalline anthraquinone structure that disperses efficiently during compounding. The higher density relative to most polymers (typically 0.9–1.4 g/cm³) should be accounted for in masterbatch let-down ratio calculations to achieve target color concentration.
Frequently Asked Questions — Solvent Green 28
How does Solvent Green 28 compare to Pigment Green 7 for transparent polymer applications?
Solvent Green 28 dissolves completely in the polymer melt, achieving molecular-level dispersion that preserves the optical clarity of transparent substrates such as PC, PMMA, and PET. Pigment Green 7 (PG7), being a particulate pigment, inherently scatters light and reduces transparency even at low loadings. For applications demanding both vibrant green color and high light transmission — such as LED diffusers, transparent packaging, or tinted lenses — Solvent Green 28 is the technically superior choice. However, for opaque applications requiring maximum weather resistance, PG7 may be preferred.
What is the recommended processing temperature range for Solvent Green 28 in ABS?
Solvent Green 28 demonstrates heat resistance of 260–280°C in ABS, which aligns well with standard ABS injection molding temperatures of 230–260°C. For optimal results, process ABS compounds containing Solvent Green 28 at 240–255°C with typical residence times under 5 minutes. If your specific ABS grade requires processing above 260°C, pre-trials are recommended to verify shade stability, as prolonged exposure at the upper limit may cause slight shade drift in some formulations.
Can Solvent Green 28 be used for polyester fiber spin-dyeing at industrial scale?
Yes, Solvent Green 28 is specifically formulated for polyester fiber and yarn coloration. Its anthraquinone structure provides excellent thermal stability at PET melt-spinning temperatures (280–295°C), and its solubility profile ensures uniform dispersion without filter pack clogging. Recommended starting dosage is 0.03% for transparent POY/DTY yarns. The dye exhibits good wash fastness and dry-cleaning fastness on polyester substrates, meeting standard textile colorfastness requirements.
What are the solubility characteristics of Solvent Green 28 in common organic solvents?
At 20°C, Solvent Green 28 exhibits solubility of 50 g/L in dichloromethane, 4.5 g/L in butyl acetate, 2.0 g/L in acetone, and 0.1 g/L in ethanol. It is practically insoluble in methylbenzene (toluene). This solubility profile supports solvent-based masterbatch preparation using chlorinated or ester solvents. For water-based ink or coating formulations, pre-dissolution in a compatible co-solvent followed by emulsification is recommended, as the dye has negligible water solubility.
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