Solvent Orange 63 / Solvent Dyes
Solvent Dyes
Technical Information
High-Performance Fluorescent Orange Solvent Dye for Engineering Plastics & Fibers
Solvent Orange 63 (CAS 16294-75-0) is a premium fluorescent orange solvent dye engineered for high-temperature polymer processing and specialty fiber coloration. With an exceptional melting point of 320°C and heat resistance rated up to 340°C in polycarbonate, this dye outperforms most conventional fluorescent orange colorants in thermal stability — making it the preferred choice for engineering plastics that demand aggressive processing conditions, including PC injection molding, PET fiber melt-spinning, and high-temperature extrusion of ABS and SAN components.
Unlike standard fluorescent dyes that degrade rapidly above 250°C, Solvent Orange 63 maintains its brilliant fluorescent orange hue and tinting strength even after prolonged exposure to molten polymer temperatures. Its light fastness rating of 7–8 (Blue Wool Scale) in PS and rigid PVC is outstanding for a fluorescent dye, ensuring long-term color integrity in indoor signage, safety equipment, and decorative automotive trim where fluorescent visibility is essential.
Compared to Solvent Orange 60, SO63 offers significantly higher heat resistance (300°C in PS vs. 250°C) and a broader polymer compatibility profile spanning 8 major substrate classes. The dye shows excellent fiber affinity for polyester and PA6, enabling vivid orange coloration in synthetic textiles and industrial fibers. Its combination of fluorescence, thermal endurance, and multi-substrate versatility makes SO63 the go-to solution for safety-critical and high-visibility coloration across plastics and textiles.
Product specification
Appearance: Dark red powder — the deep red powder form indicates high dye concentration and uniform particle morphology; consistent powder form ensures precise gravimetric dosing and homogeneous melt dispersion.
Tinting Strength: 100±3% — measures the dye’s color-producing power relative to a certified reference; the tight ±3% tolerance guarantees that every batch delivers identical fluorescent orange intensity for production consistency.
Shade Color: Similar to the standard, fluorescent orange — confirms the fluorescent orange hue matches under controlled D65 illumination; fluorescence intensity is verified visually under UV-A excitation.
Ash: ≤ 1.0% — low inorganic residue indicates high organic purity, critical for preventing spinneret clogging in fiber melt-spinning and filter blockage in thin-wall injection molding.
Moisture: ≤ 1.0% — controlled moisture prevents hydrolysis during high-temperature PET and PA6 processing, where even trace water can cause polymer chain degradation and visual defects.
Color Differential Value (ΔE): ≤ 0.7 — maximum permissible color deviation; a ΔE below 1.0 is imperceptible to the human eye, ensuring seamless shade matching across production lots.
Density: 1.49 g/cm³ — higher than average solvent dye density, relevant for volumetric dosing calculations and specific gravity matching in multi-component polymer systems.
Melting Point: 320°C — one of the highest melting points among commercial fluorescent solvent dyes; this thermal headroom ensures complete dissolution and streak-free coloration even in polycarbonate processing at 300–340°C.
Physical Properties:
| Test Items | PS | ABS | SAN | PMMA | PC | R-PVC | PA6 | PET |
| Heat resistance temperature, °C
(0.05% dyes, transparent) |
300 | 280 | 300 | 300 | 340 | – | – | 300 |
| Heat resistance temperature, °C
(0.05% dyes + 1.0% Titanium dioxide) |
300 | 260 | 280 | 280 | 320 | – | – | 280 |
| Migration resistance | – | – | – | – | – | – | – | – |
| Light fastness (0.05% dyes, transparent) | 7-8 | 7 | – | – | – | 7 | 7 | |
| Weather resistance | – | – | – | – | – | – | – | – |
| Acid resistance (in 5% hydrochloric acid solution) | – | – | – | – | – | 5 | – | – |
| Alkali resistance (in 5% caustic soda solution) | – | – | – | – | – | 5 | – | – |
Technical data interpretation: SO63 achieves 300°C+ heat resistance in PS, SAN, PMMA, and PET transparent systems — among the highest ratings for any fluorescent orange dye. The 20°C drop in ABS with TiO₂ (280°C → 260°C) is typical for opaque systems where TiO₂ catalyzes dye degradation. Light fastness of 7–8 in PS and rigid PVC is exceptional for a fluorescent colorant, approaching the performance of non-fluorescent high-performance pigments.
Application Profile
| PS | ● | HIPS | ● | ABS | ● |
| PC | ● | PVC-R | ● | PMMA | ● |
| SAN | ● | AS | ● | PA | – |
| PET | ● |
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.
Why Choose Honor Pigments?
- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
- ✅ Strict Quality Control — ISO 9001 certified with batch-to-batch consistency and zero-defect policy
- 💰 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?
Request TDS, SDS, or a free sample for testing.
Frequently Asked Questions — Solvent Orange 63
What makes Solvent Orange 63 suitable for high-temperature engineering plastics?
Solvent Orange 63 has an exceptionally high melting point of 320°C, allowing it to withstand processing temperatures up to 340°C in polycarbonate and 300°C in PS, SAN, PMMA, and PET without color degradation. This thermal stability is rare among fluorescent dyes, which typically decompose above 250°C. The dye’s molecular structure provides inherent thermal resistance, making it ideal for engineering plastic components produced via injection molding, extrusion, and melt-spinning where processing temperatures exceed 280°C.
How does Solvent Orange 63 compare to Solvent Orange 60 in heat resistance and polymer compatibility?
Solvent Orange 63 offers substantially higher heat resistance than SO60: 300°C in PS (vs. ~250°C for SO60) and 340°C in PC (SO60 is not rated for PC). SO63 also covers a broader polymer compatibility range — it is recommended for 8 substrate types (PS, HIPS, ABS, PC, PVC-R, PMMA, SAN, AS, PET) compared to SO60’s more limited profile. The higher light fastness rating (7–8 vs. 5–6 for SO60) further extends SO63’s usable life in semi-exposed applications such as automotive trim and industrial signage.
Can Solvent Orange 63 be used for fiber and textile coloration?
Yes. Solvent Orange 63 is suitable for polyester fiber and PA6 (nylon 6) fiber coloration, delivering vivid fluorescent orange shades with good wash fastness. It has limited use in PA66 fiber due to the higher processing temperatures involved. For optimal fiber dyeing results, the dye is typically dissolved in a carrier solvent and applied during the melt-spinning process at 0.03–0.05% concentration. The fluorescent properties enhance visibility in safety textiles, high-visibility workwear, and decorative fabrics.
How does Honor Pigments ensure quality consistency for Solvent Orange 63 across shipments?
Every batch of Solvent Orange 63 undergoes comprehensive quality testing: tinting strength verification (100±3%), shade matching (ΔE ≤ 0.7 under D65 standard illuminant), ash content (≤1.0%), moisture content (≤1.0%), density (1.49 g/cm³), and melting point (320°C) confirmation. All test results are documented per ISO 9001 quality management procedures and retained for 3 years. A Certificate of Analysis (COA) accompanies every shipment, and spectrophotometer curves are available upon request for exact shade matching verification.