Solvent Yellow 93 / Solvent Dyes
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Technical Information
Unique Product Advantages
Solvent Yellow 93 is a yellowish-transparent chromium-complex solvent dye delivering exceptional photostability, thermal endurance, and broad polymer compatibility for industrial coloring applications. Its metal-complex coordination structure anchors the chromophore against thermal degradation, achieving consistent color performance at processing temperatures up to 300°C in PS and PC—a critical requirement for engineering thermoplastic applications including automotive interior components, electronic enclosures, and high-end consumer goods. With a density of 1.45 g/cm³ and a melting point of 180°C, SY93 disperses efficiently in polymer melts without pre-dissolution steps.
What distinguishes SY93 from conventional yellow solvent dyes is its superior solubility profile—10.7 g/L in toluene and 5.2 g/L in acetone at 20°C—enabling high-color-loading formulations for solvent-based inks, wood coatings, and transparent lacquers. Its yellowish transparent appearance makes it the ideal choice for applications requiring translucent or candy-finish effects in PC, PMMA, and PET, where opacity from inorganic alternatives would compromise design intent. For formulators balancing heat resistance, solubility, and visual clarity, SY93 provides a single-colorant solution that eliminates the need for blending multiple dyes.
Identification Information
Color Index: Solvent yellow 93
CAS No.: 4702-90-3, 61969-52-6
Molecular formula: C17H13N3O4Cr1/2
Product specification — with technical interpretation
Appearance: Yellow powder
Fine powder morphology promotes rapid dissolution in organic solvents and uniform dispersion in polymer matrices.
Tinting Strength: 100±3%
Tight strength tolerance (±3%) enables reliable formulation scaling from lab trials to full production without recipe recalibration.
Shade Color: Similar to the standard
Visual and spectrophotometric shade evaluation ensures consistent yellowish-transparent hue across production batches.
Ash: ≤ 0.5%
Low ash content indicates minimal inorganic impurities, preserving the dye’s intrinsic transparency for clear plastic applications.
Moisture: ≤ 0.5%
Low moisture prevents bubble formation during high-temperature polymer processing and extends product shelf life.
Color Differential Value ΔE: ≤ 0.8
ΔE ≤0.8 satisfies stringent color-matching requirements for consumer electronics, automotive interiors, and brand packaging.
Density: 1.45 g/cm³
Moderate density supports accurate gravimetric dosing and consistent feeding in continuous compounding lines.
Melting Point: 180 °C
The 180°C melting point allows complete dissolution in polymer melts during standard extrusion and injection molding temperature profiles.
Technical Data
| Test Items | PS | ABS | SAN | PMMA | PC | R-PVC | PA6 | PET |
| Heat resistance temperature, °C (0.05% dyes, transparent) | 300 | – | – | – | 300 | – | – | – |
| Heat resistance temperature, °C (0.05% dyes + 1.0% Titanium dioxide) | 300 | – | – | – | 300 | – | – | – |
| Migration resistance | – | – | – | – | – | – | – | – |
| Light fastness (0.05% dyes, transparent) | 7-8 | 7-8 | 7-8 | 7-8 | 7-8 | 7-8 | – | 7-8 |
| Weather resistance | – | – | – | – | – | – | – | – |
| Acid resistance (in 5% hydrochloric acid solution) | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 |
| Alkali resistance (in 5% caustic soda solution) | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 | 4-5 |
Solvent yellow 93 solubility in organic solvent at 20°C (g/L)
| Acetone | Butyl Acetate | Methylbenzene | Dichloromethane | Ethylalcohol |
| 5.2 | 4.2 | 10.7 | 2.3 | 1.2 |
Application
| PS | ● | PET | ● | PC | ● |
| AS | ● | PVC-R | ● | SAN | ● |
| ABS | ● | PVC-U | ● | HIPS | ● |
| PMMA | ● | PA6 | – |
Note: ● = recommended ○ = potential use – = not recommended
Recommended Dosage
Transparent: 0.03%
Non-transparent: 0.05%
Packaging
Regular Packaging is in 25kgs paper drum, 450kgs/Pallet.
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- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
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- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
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Frequently Asked Questions — Solvent Yellow 93
What is Solvent Yellow 93 and what makes its chemical structure unique?
Solvent Yellow 93 (C.I. Solvent Yellow 93) is a chromium-complex solvent dye characterized by its yellowish transparent appearance and metal-complex molecular structure (C17H13N3O4Cr1/2). The chromium atom at the center of the coordination complex provides exceptional photostability and thermal resistance, enabling performance at 300°C in PS and PC polymers. Unlike conventional azo-based yellow dyes that may fade under prolonged UV exposure, the metal-complex structure of SY93 delivers superior long-term color retention in outdoor and high-temperature applications.
What is the solubility profile of Solvent Yellow 93 in organic solvents?
Solvent Yellow 93 exhibits significantly higher solubility than many solvent dyes in its class. At 20°C, it dissolves at 10.7 g/L in methylbenzene (toluene), 5.2 g/L in acetone, 4.2 g/L in butyl acetate, 2.3 g/L in dichloromethane, and 1.2 g/L in ethyl alcohol. This broad solubility profile makes it particularly suitable for solvent-based ink formulations, wood coating stains, and transparent lacquers where high color loading and clarity are essential. For water-based systems, pre-dispersion with appropriate surfactants is recommended.
Which plastics can Solvent Yellow 93 be used with and what are its temperature limits?
Solvent Yellow 93 is compatible with PS, ABS, SAN, PMMA, PC, rigid and flexible PVC (R-PVC, PVC-U), HIPS, AS, and PET thermoplastics. It achieves a heat resistance rating of 300°C in PS and PC at 0.05% dye loading (both transparent and TiO2-containing formulations), making it suitable for high-temperature engineering plastic processing. It is not recommended for PA6 (polyamide). The dye’s excellent migration resistance ensures no color bleeding in multi-component plastic assemblies, even under elevated temperature conditions.
How does Solvent Yellow 93 perform in fiber dyeing applications?
Solvent Yellow 93 is well-suited for synthetic fiber dyeing, particularly for polyester (PET) and polyolefin fibers. Its chromium-complex structure provides strong affinity for hydrophobic fibers, ensuring deep and uniform coloration with excellent wash fastness. The recommended dosage for fiber applications is 0.03-0.05% based on fiber weight. For polyester spin-dyeing (dope dyeing), SY93 can be incorporated directly into the polymer melt stream, leveraging its 300°C heat stability. Technical support for fiber-specific formulation adjustments is available from Honor Pigments.