Solvent Violet 31 / Solvent Dyes
Solvent Dyes
Technical Information
CAS No.: 70956-27-3
Molecular formula: C14H8Cl2N2O2
Feature: excellent heat resistance and light resistance, good migration resistance and high tinting strength with wide application.
Application: used for coloring for plastics, PS, ABS, PMMA, PC, PET, polymer, fiber. polyester fiber, inks including inkjet ink.
Identification Information:
Color Index: Solvent Violet 31
CAS No.: 70956-27-3
Molecular formula: C14H8Cl2N2O2
Chemical Family: Anthraquinone Series
Product Overview
Solvent Violet 31 is a high-performance anthraquinone-based solvent dye delivering a reddish violet shade with exceptional thermal stability up to 310°C in polycarbonate. Unlike many violet dyes in the solvent dye family that compromise between color intensity and heat resistance, SV31 achieves both—maintaining structural integrity through high-temperature polymer processing while delivering rich, transparent coloration. Its chlorine-substituted anthraquinone backbone (C₁₄H₈Cl₂N₂O₂) provides inherent UV stability, making it a preferred choice for outdoor PET packaging and automotive interior components where long-term color retention is critical. In inkjet ink formulations, SV31 offers excellent solubility in dichloromethane (40 g/L at 20°C) and reliable jetting performance without nozzle clogging. Industrial compounders value its migration resistance rating of 5 across PS, ABS, SAN, and PMMA substrates, ensuring clean multi-material molding without color bleed. With a melting point of 282°C, SV31 processes comfortably in engineering thermoplastics including PC and PET, offering formulators a robust violet option that bridges the gap between standard solvent dyes and more expensive pigment dispersions.
Product specification
Appearance: Violet powder — Consistent particle morphology ensures uniform dispersion across polymer matrices and solvent systems.
Tinting Strength: 100±3% — Tight tolerance control guarantees batch-to-batch color consistency in production-scale compounding.
Shade Color: Similar to the standard — Verified against master reference standards under D65 illuminant for precise color matching.
Ash: ≤ 1.0% — Low inorganic residue ensures clean processing without filter blockage in fiber spinning applications.
Moisture: ≤ 1.0% — Controlled moisture content prevents hydrolysis and bubble formation during high-temperature extrusion.
Color Differential Value ΔE: ≤ 0.8 — Industry-standard color tolerance; ΔE < 1.0 is considered imperceptible to the human eye.
Density: 1.30 g/cm³ — Moderate density facilitates even distribution in both powder blending and masterbatch processes.
Melting Point: 282°C — High melting point confirms suitability for engineering thermoplastics processed above 280°C, including PC and PET.
Technical Data
| Test Items | PS | ABS | SAN | PMMA | PC | R-PVC | PA6 | PET |
| Heat resistance temperature, °C (0.05% dyes, transparent) | 300 | 290 | 300 | 300 | 310 | – | – | 290 |
| Heat resistance temperature, °C (0.05% dyes + 1.0% Titanium dioxide) | 280 | 270 | 280 | 280 | 290 | – | – | 270 |
| Migration resistance | 5 | 5 | 5 | 5 | – | – | – | – |
| Light fastness (0.05% dyes, transparent) | 7-8 | 3-4 | – | – | 7 | – | 7-8 | |
| Weather resistance | – | – | – | – | – | – | – | – |
| Acid resistance (in 5% hydrochloric acid solution) | 4 | 4 | 4 | 4 | 4 | 4 | – | – |
| Alkali resistance (in 5% caustic soda solution) | 4 | 4 | 4 | 4 | 4 | 4 | – | – |
Solvent Violet 31 solubility in organic solvent at 20°C (g/l)
| Acetone | Butyl Acetate | Methylbenzene | Dichloromethane | Ethylalcohol |
| 20 | 18 | 20 | 40 | 1 |
Application
| PS | ● | PET | ● | PC | ● |
| AS | ● | PVC-R | ● | SAN | ● |
| ABS | ● | PVC-U | ● | HIPS | ● |
| PMMA | ● | PA6 | – |
Note: ● = recommended ○ = potential use – = not recommended
Recommended Dosage
Transparent: 0.025
Non-transparent: 0.05
Packaging:
Regular Packaging is in 25kgs paper drum, 450kgs/Pallet.
Why Choose Honor Pigments?
- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
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- 💰 OEM Production Advantage — Competitive pricing without compromising pigment performance
- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
📩 Need more details?
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Frequently Asked Questions — Solvent Violet 31
What makes Solvent Violet 31 different from Solvent Violet 13 in performance?
Solvent Violet 31 (anthraquinone, C₁₄H₈Cl₂N₂O₂) differs from Solvent Violet 13 (C₂₁H₁₅NO₃) in several key aspects: SV31 offers a reddish violet shade versus SV13’s bluish violet, has a significantly higher melting point of 282°C vs 189°C, superior dichloromethane solubility (40 vs 35 g/L), and achieves light fastness ratings of 7-8 in PS and PET. SV31 is the preferred choice for high-temperature PC processing at 310°C, while SV13 offers brighter color with superior acid/alkali resistance (rating 5 vs 4) in standard applications.
Can Solvent Violet 31 be used in food-contact PET packaging?
Solvent Violet 31 is engineered for industrial plastics, fiber, and ink applications. For food-contact PET packaging, specific migration limit (SML) testing should be conducted according to regional regulations including EU 10/2011 and FDA 21 CFR. Honor Pigments provides comprehensive technical documentation upon request. For any food-grade or indirect food-contact application, consult our technical team for application-specific compliance assessment before production use.
What is the recommended dispersion method for Solvent Violet 31 in polycarbonate?
For optimal dispersion in polycarbonate, pre-dry both the PC resin and SV31 powder at 120°C for 4 hours before compounding. Use a twin-screw extruder with a temperature profile of 260-300°C and moderate screw speed (200-300 RPM) to ensure uniform color distribution. Recommended dosage: 0.05% for transparent coloration, 0.05% dye with 1.0% TiO₂ for opaque formulations. At 310°C processing (SV31’s upper thermal limit in PC), limit residence time to under 5 minutes to maintain color consistency.
How does the light fastness of Solvent Violet 31 compare across different polymer substrates?
SV31 exhibits significant substrate-dependent light fastness variation: ratings of 7-8 in PS and PET (excellent for outdoor signage and packaging), 7 in PC (suitable for automotive interior components), but only 3-4 in ABS (recommended for indoor applications only). This performance gradient results from differences in UV transmission characteristics of each polymer matrix—PS and PET inherently filter more UV radiation than ABS. For ABS applications requiring higher light stability, consider Solvent Violet 13 (rating 6 in ABS) or contact Honor Pigments for UV stabilizer package recommendations.