Section
| HS Code | 369159 |
| Productname | Solvent Orange 58 |
| Colorindexname | C.I. Solvent Orange 58 |
| Casnumber | 12227-68-8 |
| Einecsnumber | 235-423-3 |
| Chemicalclass | Chromium complex azo solvent dye |
| Appearance | Orange powder |
| Colorshade | Orange |
| Solubility | Soluble in alcohols, ketones, esters and aromatic solvents; insoluble in water |
| Density | Approximately 1.5 g/cm3 |
| Meltingpoint | >200 °C (decomposition) |
| Ph | 6-8 (1% suspension) |
| Moisture | ≤1.0% |
| Ash | ≤0.5% |
| Purity | ≥95% (commercial grade) |
| Heatstability | Good up to about 200 °C |
| Lightfastness | Good |
| Migrationresistance | Good |
As an accredited Solvent Orange 58 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Solvent Orange 58 is packaged in 25 kg fiber drums with polyethylene liners, securely sealed for safe storage and transport. |
| Container Loading (20′ FCL) | Solvent Orange 58 is securely packed and loaded into a 20-foot FCL container for safe, compliant ocean shipment. |
| Shipping | Solvent Orange 58 should be shipped in sealed, properly labeled containers in compliance with its current SDS and local transport regulations. Store and transport in a cool, dry, well-ventilated area away from ignition sources, oxidizers, moisture, and direct sunlight. Verify any UN number, hazard class, and packing requirements before shipment. |
| Storage | Store Solvent Orange 58 in a cool, dry, well-ventilated area, protected from heat, sparks, open flames, and direct sunlight. Keep containers tightly closed, clearly labeled, and upright. Separate from strong oxidizers, acids, food, and feed. Avoid dust generation, use suitable PPE, and provide spill containment. Follow local regulations and the safety data sheet. |
| Shelf Life | Typically 24 months when stored cool, dry, well-ventilated, and away from direct sunlight and ignition sources. |
Single-screw compounding of Solvent Orange 58 into PMMA for rear-lamp optics is operated with a side-fed colour masterbatch rather than raw powder addition, because the powder’s static charge and fine particle size cause feed-throat hang-up and intermittent colour streaks. A masterbatch is let down to a final dye concentration of 0.03–0.12 wt% at melt temperatures between 225 °C and 245 °C on a 27 mm twin-screw line with an L/D ratio of 44:1 and a vacuum vent at barrel 8. The critical failure mode in this window is not thermal degradation, but plate-out on the die land when the dye is insufficiently dispersed in an incompatible wax carrier. Incoming PMMA pellets are pre-dried at 80 °C for 3 h to below 0.03 wt% moisture before compounding, and the melt is filtered at 20 µm. Colour acceptance for the moulded part is measured with a spectrophotometer using D65/10° geometry under ASTM E308, with transmission haze checked per ASTM D1003; haze values above 3% at 3.2 mm thickness are rejected by automotive lighting specification. Lightfastness requirements are verified per ISO 4892-2 method A with a 1000 h xenon-arc exposure, and Grey Scale change below 4 signals insufficient grade selection. The dye must not be formulated with free amine-based antistatic additives, because amine groups can shift the absorption maximum and create a visible bathochromic drift after thermal ageing. Published data for this exact dye grade in PMMA at this processing window are limited, so a two-lot colour trial is required before release.
In bottle-grade PET preform moulding, the dye is introduced as a 0.5 wt% solid masterbatch in a PET carrier that is dried together with the base resin at 160 °C for 4 h to a target moisture content below 50 ppm. The drying condition is the first process conflict: insufficient drying causes hydrolytic chain scission during plastication, and the resulting intrinsic-viscosity drop is then misattributed to the colorant. Injection is performed on a 350 MPa hydraulic clamp unit with a 90 mm reciprocating screw and a hot-runner manifold held at 285 °C; barrel zones from feed to nozzle are set at 270 °C, 280 °C, 285 °C, and 280 °C. The preform mould temperature is maintained at 12 °C with a 14 s cooling time. Acetaldehyde formation is monitored by grinding a preform sample under liquid nitrogen and analysing by headspace gas chromatography according to a modified ASTM F2013-10 procedure; values above 8 µg/L in the final preform are outside standard carbonated-soft-drink norms. The dye contributes no measurable acetaldehyde scavenging or formation at this addition level, but the masterbatch carrier must be isomer-grade PET with the same intrinsic viscosity as the base resin, otherwise local viscosity gradients create visual flow lines. Reheat stretch-blow moulding of the tinted preform is performed at an infrared oven output of 85%, with surface temperature measured at 105–115 °C by pyrometer. If Solvent Orange 58 absorbs a portion of the lamp energy in the 700–1100 nm range, preform surface heating may shift; a transmission scan between 400 nm and 1200 nm is therefore required before setting reheat oven profiles. Food-contact status is not assumed from the dye index alone: compliance under 21 CFR 178.3297 or EU 10/2011 must be confirmed from the supplier’s migration data, because published clearance data for Solvent Orange 58 are limited.
Spray-up application of Solvent Orange 58 in an isophthalic-neopentyl glycol gel coat is carried out with a catalyzed resin system containing 0.25 phr cobalt naphthenate accelerator, 1.5 phr methyl ethyl ketone peroxide, and 0.15 wt% dye based on resin. The first production sign of an unsuitable colourant is geltime drift: the colorant’s redox-active quinoid structure can either accelerate or retard free-radical cure, and geltime must be re-established on each new dye lot by the cup method specified in ISO 2535:2001 at 25 °C. A drift greater than 15% relative to the unpigmented control is normally rejected by fiberglass shops because spray-up gun tip setting and fibre wet-out are matched to the original geltime. The gel coat is sprayed at 0.5 mm to 0.7 mm wet thickness into a mould previously conditioned at 25 °C and 65% relative humidity; after cure, a Barcol Hardness model 934-1 reading below 45 at 30 min signals under-cure at the surface. Solvent Orange 58 is not added directly to the resin drum; it is pre-dispersed in a styrene-compatible non-phthalate carrier and passed through a high-shear disperser at 3000 rpm for 15 min before catalyst addition. In accelerated weathering, gel coat panels are exposed per ISO 4892-2 with a black-standard temperature of 65 °C and a 102 min dry/18 min spray cycle; colour retention is evaluated by ISO 105-A05 grey scale, and a rating below 3 after 1000 h is generally outside marine gel coat specification.
Calendered rigid PVC film tinted with Solvent Orange 58 is produced on a four-roll L-type calender with a roll surface temperature profile of 165 °C, 170 °C, 175 °C, and 170 °C; the dye is fed as a 1.0 wt% masterbatch in a K-value 57 PVC carrier after the dry blend has passed the high-speed mixer at 120 °C. The addition rate in the final film is 0.05–0.15 wt%. The principal processing test is plate-out on chrome rolls after a continuous run of 8 h: a colorant that blooms to the roll surface is transferred to the next production batch and creates visible repeating bands. For that reason, the roll release agent level is kept at the minimum specified by the PVC stabilizer supplier, and the melt viscosity is recorded by a Brabender Plasticorder torque method to ensure the masterbatch is fully fluxed before the calender gap. Migration fastness in the finished sheet is tested by sandwiching the tinted film between two white PVC sheets under a 5 kg load at 70 °C for 24 h per a modified ASTM D3291-11 procedure, and any visible staining greater than Grey Scale 4 is rejected. The dye has limited solubility in aliphatic hydrocarbon processing aids; therefore only ester- or ketone-based lubricant packages are used when transparent orange edge-trim regrind is to be reintroduced at levels up to 20 wt%. RoHS screening by XRF per IEC 62321-3-1:2013 for lead, cadmium, mercury, and hexavalent chromium is performed on the tinted film; the dye must not add detectable amounts above 100 ppm for cadmium and 1000 ppm for lead.
Solvent Orange 58 in a gravure ink for surface-printed BOPP labels is pre-dissolved in a 4:1 methyl ethyl ketone/cyclohexanone blend at a dye concentration of 20 wt%, then let down into a nitrocellulose-polyurethane vehicle at a final dye content of 6–10 wt% of non-volatile matter. The switch from toluene to ethyl acetate lowers the solubility envelope and changes the drying gradient: a 200 m/min press speed with 55 °C impingement air may produce retained solvent above the 5 mg/m² limit if the dye solution is not fully compatible. Viscosity at press side is controlled at 19 s to 23 s on a DIN 4 mm cup at 23 °C according to DIN 53211, and dilution is made with a 70:30 ethyl acetate/n-propanol blend to avoid resin shock. Colour strength is verified by proofing against a standard at 12 µm cell depth and measuring the 460–580 nm reflectance curve with a spectrophotometer under D50/2° geometry per ISO 13655:2017. The ink is checked for plate stain after 100,000 impressions; dye recrystallization on the cylinder cell walls is detected as a progressive reduction in density and an increase in dot gain above 5%. The reformulated ink must also be screened for short-term odour and retained solvent by gas chromatography per a modified EN 13628-1:2002 method. Because Solvent Orange 58 has limited published toxicological data under this specific ink configuration, end-use compliance under the Swiss Ordinance on printing inks is confirmed only by migration testing through the printed substrate with Tenax simulant at 40 °C for 10 days.
Melt colouration of Nylon 6 staple fibre with Solvent Orange 58 is carried out with a 0.06 wt% final dye loading introduced as a 5 wt% masterbatch in a low-viscosity PA6 carrier, dried to below 0.08 wt% moisture at 80 °C for 12 h before extrusion. The spinning line is based on a 75 mm single-screw extruder with an L/D ratio of 30:1, a melt pump, and a 15 µm spin-pack filter; barrel temperatures are profiled from 240 °C at the feed zone to 265 °C at the metering zone, with the melt pump and head held at 260 °C. Residence time above 250 °C is kept below 8 min because thermal history in the presence of nylon amine end groups can darken the hue if the dye is recycled in fibre scrap. The melt-spun filament is quenched with 18 °C air at 0.35 m/s and drawn at a draw ratio of 3.2:1, then heat-set at 170 °C. Fibre colour fastness is tested to ISO 105-B02 with xenon arc exposure, and a blue wool rating below 6 after 400 h is outside automotive interior specification; gasoline stain fastness is tested per ISO 105-E07. The dye must survive spin-finish application and subsequent texturing at 180 °C, so a 20 kg production trial is run before bulk approval.
Polycarbonate/ABS blends for consumer electronics housings are tinted with Solvent Orange 58 at a final dye concentration of 0.02–0.08 wt%, using a 0.5 wt% concentrate in a PC-SAN carrier. The blend is compounded on a 40 mm twin-screw extruder at 260–275 °C with a vacuum vent at -0.08 MPa; the melt is then injection moulded at a melt temperature of 270 °C and a mould temperature of 80 °C. The key production defect is weld-line colour shift: if the dye has insufficient solubility in the ABS phase, the weld line appears lighter and more yellow than the bulk. The defect is minimized by keeping the ABS fraction below 30 wt% and by adding the colour concentrate to the PC-rich melt stream. Moisture in PC/ABS must be reduced to below 0.02 wt% before processing; otherwise hydrolysis-induced molecular weight loss changes melt flow and causes the dye to migrate to the surface during moulding. Melt flow rate is checked per ISO 1133-1:2022 at 260 °C with a 5 kg load, and the tinted material is rejected if the MFR shift exceeds 20% of the uncoloured control.
Competitive Solvent Orange 58 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to sales3@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: sales3@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Among the mid-shade solvent dyes used for transparent thermoplastic coloration, C.I. Solvent Orange 58 is supplied as a dark orange powder with molecular solubility in aromatic hydrocarbons, ketones, esters, and selected glycol ethers. The technical-grade product is specified on certificate-of-analysis documentation as dye content not less than 96.0% by visible spectrophotometry at λmax 470 nm, moisture not greater than 0.5% by weight by Karl Fischer titration, ash not greater than 0.2% by weight by ISO 3451-1, and residue on 325 mesh not greater than 0.5% by weight. Bulk density ranges from 0.45 g/cm³ to 0.65 g/cm³ by ISO 60. Packaging is typically 20 kg fiber drum with LDPE liner. The dye dissolves molecularly in styrenic, acrylic, polycarbonate, polyester, and plasticized PVC matrices at letdown ratios between 0.01 wt% and 1.0 wt%, depending on required transmission and color intensity.
In melt processing operations, twin-screw compounding lines with L/D 40:1 and screw speeds of 300 rpm to 500 rpm are used to distribute the dye in ABS, SAN, or polycarbonate. Predispersion in a low-acid mineral oil or DOP at 20 wt% to 30 wt% active content reduces screw slippage and dusting at the feed throat. Pre-drying of polycarbonate for 4 h at 120°C is required when ambient relative humidity exceeds 60%; residual moisture above 0.02% in the resin can cause hydrolysis-induced hue shift and surface splay. In injection molding of PMMA, melt temperatures above 260°C should be limited to dwell times under 5 min to avoid thermal oxidation of the chromophore.
Chemical identity is defined by the C.I. Solvent Orange 58 designation and the technical-grade model supplied for polymer and coatings applications. The product does not contain extenders, and the spectrophotometric assay is conducted in toluene at 470 nm against a certified reference lot. Solubility at 25°C in methyl ethyl ketone exceeds 50 g/L; in toluene exceeds 80 g/L; in ethanol is below 5 g/L. These solubility parameters influence carrier selection for liquid color systems.
Because the dye is molecularly soluble, high-speed injection molding of styrenic resins typically employs a single-pigment masterbatch at 20 wt% in polystyrene, let down to final resin by 25:1. Injection molding temperature for ABS is maintained at 220°C to 240°C with barrel residence time under 8 min; longer residence time causes darkening and a shift in yellowness index measured by ASTM E313-20. In SAN, a melt temperature of 230°C is preferred to avoid phase separation at high dye loadings.
For polycarbonate headlamp glazing and other high-heat transparent components, the colorant must survive a melt temperature of 300°C to 320°C during injection molding without generating streaking, yellowing, or gas deposit on the mold surface. Solvent Orange 58 is typically evaluated at 0.05 wt% to 0.2 wt% with UV absorbers and hindered amine stabilizers. Xenon-arc exposure by ISO 4892-2 through 2.0 mm translucent plaques shows that the product retains acceptable color stability at blue-wool rating 6 when co-formulated with UV absorbers. Thermal gravimetric analysis at 10°C/min under nitrogen indicates the main mass-loss event begins near 340°C; however, published data for this specific configuration is limited, and processors should validate hue shift at the intended 300°C residence time and hold pressure.
In acrylic and polyester sheet applications, Solvent Orange 58 provides high transparency at low concentration. For poly(methyl methacrylate) cast sheet, dissolving the dye in methyl methacrylate monomer before polymerization yields a haze value below 1% when measured by ASTM D1003-13 at 550 nm and 3.0 mm thickness. In PET bottle preforms, the dye is introduced via liquid masterbatch at 0.02 wt% to 0.08 wt%; the preforms are then blown at 105°C to 115°C. Colorimetric consistency is measured by CIELAB ΔE*ab below 1.2 across 30,000 preforms when the liquid masterbatch dosing pump maintains volumetric variation below 0.3%. In polyester extrusion, vented screw configurations with melt temperature 270°C to 280°C are preferred, because excessive residence time above 285°C causes transesterification-induced shifts in shade.
For solvent-based industrial coatings, the dye is suitable for transparent orange finishes where metallic pigment must remain visible. In CAB and acrylic lacquers, it is added at 0.1 wt% to 0.5 wt% of total solids. Application by conventional spray at 15 µm to 25 µm dry film thickness produces a transparent, high-chroma finish. Initial gloss measured by ISO 2813 at 20° remains above 85 GU; a xenon-arc exposure of 800 h by ISO 11341 may shift ΔE*ab by 2.5 to 3.5, depending on binder type and UV absorber loading.
When gravure ink formulations are evaluated, Solvent Orange 58 is dissolved in methyl ethyl ketone or ethyl acetate at 10 wt% to 15 wt% solids before addition of acrylic binder. Viscosity measured by ISO 2431 with a 4 mm flow cup remains below 25 s at 23°C when the dye solution is added at 5 wt% of total ink. Avoid contact with strong reducing agents and primary amines because the anthraquinone chromophore may undergo reversible reduction with loss of color strength. In ketone systems, stainless steel or glass-lined equipment is specified because carbon steel can catalyze residue formation and alter shade.
Fuel-marking applications require dissolution in aromatic naphtha or xylene before dosing into diesel or heating oil. The dye is used at 2 mg/L to 10 mg/L in middle distillates. Homogeneity at 5 mg/L is verified by visible absorbance at 470 nm after inline mixing; stratification is not observed after 30 days storage at 40°C. Detection limit is below 0.1 mg/L by UV-visible spectrophotometry after extractive concentration. Extraction into an acidic aqueous phase followed by reverse-phase HPLC is used for enforcement testing; published data for this specific configuration is limited.
Comparative substitution with Solvent Orange 60 and Solvent Orange 63 requires attention to hue angle and thermal stability. In polystyrene at 0.1 wt%, Solvent Orange 60 shifts the transmission curve toward red by approximately 8 nm to 12 nm relative to Solvent Orange 58; Solvent Orange 63 produces a brighter orange with slightly higher melt sensitivity. Migration testing by EN 71-10 in polyethylene at 40°C for 10 days shows that Solvent Orange 58 has low migration under those conditions, but direct contact with polyolefin food packaging requires evaluation under EU Regulation 10/2011. These differences are formulation-dependent; published data for this specific configuration is limited.
| Test parameter | Method | Typical specification |
|---|---|---|
| Appearance | Visual | Dark orange powder |
| Dye content | Visible spectrophotometry | ≥ 96.0% |
| Moisture | Karl Fischer titration | ≤ 0.5% |
| Ash | ISO 3451-1 | ≤ 0.2% |
| Residue on 325 mesh | Wet sieve | ≤ 0.5% |
| Bulk density | ISO 60 | 0.45 g/cm³ to 0.65 g/cm³ |
High-shear dispersion is not required for molecularly soluble dyes, but dry powder addition to PVC dry blends requires care. In rigid PVC extrusion using counter-rotating twin-screw extruders with L/D 25:1, die temperature 190°C to 200°C, and screw speed 20 rpm to 40 rpm, the dye should be preblended with stabilizer at 1:10 ratio before addition to the main compound. Lead-based stabilizers may cause dulling of the chromophore in humid conditions; Ba-Zn or Ca-Zn stabilizer packages are preferred. Batch-to-batch variance in dye content of ±0.4% by spectrophotometric assay can shift final color by ΔE*ab 1.2 in rigid PVC if the masterbatch letdown is not corrected.
Unlike Pigment Orange 64, which is a high-performance organic pigment with discrete particle size distribution and opacity, Solvent Orange 58 produces transparent coloration and requires no high-shear dispersion. This distinction changes the rheological response and the required equipment. In polycarbonate, the soluble dye does not contribute to melt filtration pressure rise; by contrast, inorganic pigments may raise screen pack pressure by 0.5 MPa to 1.5 MPa over 8 h extrusion runs. In thin films, pigment aggregates above 0.5 µm scatter light and increase haze; Solvent Orange 58 creates no scattering centers if fully dissolved before solidification.
In polyolefin films, Solvent Orange 58 is rarely used above 0.02 wt% because the low polarity of polyethylene reduces molecular solubility and can produce blooming. Blooming is assessed by wipe test with white cotton after 14 days at 23°C; any visible transfer fails internal specification for food-contact film. For polypropylene, melt temperature of 220°C and co-additive solubility may be required; published data for this specific configuration is limited.
In thin-wall polycarbonate injection molding with wall thickness below 1.0 mm, inorganic pigments can reduce melt flow and create flow lines; Solvent Orange 58 dissolves at the molecular level and does not increase particulate scattering. Melt flow rate measured by ISO 1133-1:2022 at 300°C with 1.2 kg load remains within 4% of the uncolored control when the dye is used at 0.05 wt%. Tensile yield stress by ASTM D638-14 is not affected by more than 2%. Notched Izod impact by ISO 180/A remains within 5% of the control for plaques conditioned at 23°C and 50% relative humidity for 48 h. These values are typical for transparent solvent dyes in polycarbonate; end-users must verify against their specific resin grades.
For thermoplastic polyurethane and flexible PVC, migration resistance is evaluated by EN 71-10 in contact with a white PVC reference material at 40°C for 10 days. Solvent Orange 58 shows low migration under these conditions, but the value is sensitive to plasticizer level: above 30 phr of DOP the dye may migrate. In PVC compounds with plasticizer content above 50 phr, pre-testing is required before use in automotive interior parts.
| Standard or regulation | Clause or method | Status |
|---|---|---|
| EU REACH | Regulation (EC) No 1907/2006, Annex XVII | No entry restricting this substance |
| EU RoHS | Directive 2011/65/EU, Annex II | Not listed as a restricted heavy metal or brominated compound |
| US TSCA | 40 CFR Part 710 | Inventory-listed as C.I. Solvent Orange 58 |
| FDA 21 CFR | 21 CFR 178.3297 colorants for polymers | Evaluate specific use conditions; no general food-contact clearance |
| California Proposition 65 | Safe Drinking Water and Toxic Enforcement Act of 1986 | Not listed as known to cause cancer or reproductive harm; verify current listing |
Quality control for incoming material should include spectrophotometric assay, moisture, and residue on 325 mesh. A reference solution of 20 mg/L in toluene at 470 nm should be compared with a certified control lot using a dual-beam spectrophotometer. Absorbance deviation greater than ±2% from the standard lot indicates dye content variation that may require masterbatch adjustment. Laser diffraction particle size analysis is less critical because the powder is dissolved during processing; however, oversized aggregates above 10 µm can produce undissolved specks in cast sheet.
Solvent Orange 58 is not interchangeable with Solvent Orange 60 when the product must pass automotive interior weathering specifications. In accelerated weathering by SAE J2412, a 0.1 wt% polycarbonate plaque with Solvent Orange 58 may exhibit a shift of ΔE*ab 3.5 after 1000 kJ/m² exposure when compared with ΔE*ab 2.1 for Solvent Orange 60 under the same stabilizer loading. These comparative results vary with UV absorber chemistry, thickness, and exposure spectrum; published data for this specific configuration is limited. Processors should maintain identical drying, melt temperature, and stabilizer packages when evaluating alternate dyes to prevent false equivalence.
