Section
| HS Code | 737289 |
| Productname | Disperse Brown 27 |
| Colorindexname | C.I. Disperse Brown 27 |
| Dyeclass | Disperse dye |
| Chemicalclass | Azo disperse dye (typical) |
| Physicalform | Powder or granular |
| Appearancecolor | Brown |
| Applicationsubstrate | Polyester and polyester blends |
| Applicationmethod | Exhaust dyeing, high-temperature dyeing, thermosol dyeing, and printing |
| Typicaldyeingph | 4.5-5.5 |
| Watersolubility | Practically insoluble; dispersible in water |
| Dispersionstability | Good when properly dispersed |
| Lightfastness | Good (typical) |
| Washfastness | Good (typical) |
| Sublimationfastness | Good to very good (typical) |
| Perspirationfastness | Good (typical) |
| Storageconditions | Store in a cool, dry, well-ventilated place away from direct sunlight |
| Packaging | 25 kg paper bags or fiber drums (typical) |
| Typicaluselevel | 0.1-3.0% owf depending on shade |
As an accredited Disperse Brown 27 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Disperse Brown 27 is packaged in 25 kg moisture-proof woven polypropylene bags with polyethylene liners for safe storage and transport. |
| Container Loading (20′ FCL) | The chemical Disperse Brown 27 is palletized in moisture-resistant packaging and loaded into a 20-foot FCL container, securely braced. |
| Shipping | Disperse Brown 27 is shipped as a solid dye in moisture-resistant, sealed, labeled containers. It is generally not regulated for transport unless supplier documentation states otherwise. Store cool, dry, and well-ventilated, away from oxidizers; follow SDS instructions, local regulations, carrier requirements, and appropriate PPE/emergency procedures. |
| Storage | Store Disperse Brown 27 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed and labeled, protect from moisture, and avoid dust generation. Separate from strong oxidizing agents, acids, and bases. Use appropriate personal protective equipment, ensure secondary containment where required, and inspect containers regularly for leaks or damage. |
| Shelf Life | Disperse Brown 27 has a typical shelf life of 24 months when stored sealed in a cool, dry, dark place. |
On single jersey and interlock PES fabrics intended for women’s sportswear, C.I. Disperse Brown 27 is exhausted in long-tube jet dyeing machines at liquor ratios between 1:8 and 1:12. The dye addition is set from 0.05% owf for pale beige through 2.5% owf for dark brown; addition above 2.5% owf must be justified by build-up curves because bath exhaustion varies with jet nozzle geometry and dwell time. The dyebath is buffered with sodium acetate/acetic acid to pH 4.5–5.0; a drift above 5.5 produces aggregation on jet throat surfaces and visible rope marks. Dispersing agent is maintained at 0.5–1.5 g/L using naphthalene sulfonate or phenolic condensate, and the ramp rate is controlled at 1.0°C/min to 130°C with a hold time of 30–45 min. After cooling below 70°C, reduction clearing uses 2–3 g/L sodium hydrosulfite and 2 g/L sodium hydroxide at 80°C for 20 min. Over-clearing beyond 20 min strips the chromophore, producing a redder and weaker shade. Final crock fastness is evaluated according to AATCC TM8 and washing fastness according to ISO 105-C06. At jet nozzle pressures of 0.8–1.2 bar, fabric linear speeds above 350 m/min cause filament fluff; the cycle is set by rope circulation rather than winch speed. For EU shipments, the mill must verify REACH registration and maintain Article 33 declarations if any candidate list substance exceeds 0.1% w/w.
Continuous pad–dry–thermosol ranges producing 65/35 polyester-cotton twill workwear apply C.I. Disperse Brown 27 under conditions distinct from exhaust dyeing. The padding bath contains 10–30 g/L of the dye dispersion, 5–15 g/L of a polyacrylate or polyacrylamide migration inhibitor, and 0.5–1.0 g/L of a non-foaming wetting agent; mangle pickup is held at 60–70% to avoid dye liquor loss in the drying section. Drying between 100°C and 120°C is critical because residual moisture above 30% at thermofixation causes migration to the cotton surface, while over-drying above 130°C fuses dispersant and reduces diffusion into the PET core. Thermofixation is run at 205–210°C for 60–90 s in a hotflue; below 200°C colour yield is low, and above 215°C the brown shade may destabilize if no heat stabilizer is present. The cotton component is not dyed by this step; subsequent vat or reactive dyeing is often used for the cellulosic portion. A one-bath two-stage sequence must not apply reduction clearing between stages because hydrosulfite residues contaminate the cellulosic dyebath. Final workwear is tested for washing colour change according to ISO 105-C06 and for rubbing according to ISO 105-X12 after resin finishing. For brands using restricted substance lists, the batch must be screened for solvent residues and dispersant levels using HPLC fingerprints because thermosol waste heat can recrystallize low-molecular-weight dispersants on the fabric surface.
The formulation of C.I. Disperse Brown 27 into a dye-sublimation transfer ink begins with de-aggregation in a wet bead mill using yttrium-stabilized zirconia beads of 0.4–0.8 mm. The mill base is composed of 10–20 wt% dye, 5–10 wt% sulfonated polymeric dispersant, 20–30 wt% humectant, and the balance deionized water; the dispersant-to-dye weight ratio must be confirmed by surface tension and viscosity stability. The suspension is filtered through a 1 µm absolute filter because printhead nozzles below 50 µm in drop-on-demand hardware block with aggregates visible only after accelerated storage at 40°C for 72 h. For transfer, the printed paper is heated at 180–210°C for 30–60 s; lower temperatures leave residual dye on the release paper, while exceeding 60 s can shift the brown hue toward yellow. End products are polyester banners, sportswear panels, and interior photographic textiles. Compliance is governed by EN 71-3 for heavy metal release in children’s printed textiles and by REACH Annex XVII entry 43 if the commercial product is an azo chromophore; reductive cleavage testing per EN ISO 14362-1 must confirm no listed aromatic amines above 30 mg/kg. Published data for C.I. Disperse Brown 27 in a specific aqueous inkjet formulation is limited, so the mill base must be validated in the intended printhead. UV exposure resistance of the final sublimed brown will not match high-energy disperse dyes, so outdoor banners require topcoat lamination and ISO 105-B02 grade must be agreed before production.
Automotive seat insert fabrics and door panel accent textiles made from polyester filament yarn are piece-dyed or yarn-dyed with C.I. Disperse Brown 27 only after light fastness and fogging trials. The dyebath is run at 130°C for 45–60 min in a package dyeing machine with inflow/outflow cycles of 4 min each and a liquor ratio of 1:6–1:8; the additional time compared with apparel ensures migration into the fibre core. Because many brown disperse dyes have only moderate photostability, the use is limited to dark accent surfaces where the OEM light fastness target is grade 4 or higher under ISO 105-B02, but not for upper instrument panel materials that demand grade 6 without a UV absorber. A UV absorber of the benzotriazole type at 1–3% owf and a hindered amine light stabilizer are co-applied in the finishing pad if the fabric is validated for cabin use. Fogging is measured by DIN 75201 method B or VW PV 3341; reflectance values below 60% after 100°C for 16 h fail. The finish also must not increase volatile organic compound load above OEM thresholds; production-scale failures often occur when afterclear residues are not completely removed by hot rinsing above 90°C. The table below lists the validation matrix referenced in PPAP submissions.
| Property | Test standard | Typical acceptance band |
|---|---|---|
| Xenon arc light fastness | ISO 105-B02 | grade 4 minimum for accent fabric; grade 6 for upper trim |
| Fogging reflectance | DIN 75201 method B / VW PV 3341 | minimum 60% reflectance |
| Wash fastness | ISO 105-C06 A2S | shade change 4 minimum |
| Rubbing fastness | ISO 105-X12 | dry 4 minimum; wet 3 minimum |
In spin-dyeing of polyethylene terephthalate filaments, C.I. Disperse Brown 27 is exposed to a more severe thermal history than exhaust dyeing because the dye is incorporated into the melt at 270–285°C. A twin-screw extruder with L/D 44:1 is used to disperse a masterbatch containing 2–4 wt% dye in a low-molecular-weight PET carrier; the let-down ratio into virgin PET is typically between 1:20 and 1:50, giving a final fibre dye concentration of 0.1–0.5 wt%. The melt residence time should not exceed 5 min; longer residence times at 285°C can degrade the brown chromophore and shift the spun filament toward yellow or grey. Spin-pack pressure rise above the initial value by more than 50 bar within 24 h signals dispersant crystallisation or dye aggregation. The melt is filtered through a 25 µm sintered metal or steel mesh pack before the spinneret. End products are PET filament webbing, luggage shell fabric, and industrial rope covers. Published data specific to C.I. Disperse Brown 27 in PET masterbatch is limited, so each masterbatch must be qualified by filter pressure, ISO 105-B02 light fastness, and AATCC TM61 washing fastness. This route is not used for food-contact polyester because dye migration into simulants under EU 10/2011 has not been validated for this product.
Microdenier PET warp-knits impose faster strike and greater risk of channeling at low liquor ratios. Filaments with linear density below 0.5 dtex present a specific surface area high enough to exhaust C.I. Disperse Brown 27 rapidly above 100°C, so the heating ramp is limited to 0.5°C/min between 100°C and 130°C. Dyebath pH is held at 4.5–5.0; a pH of 4.0 may stimulate further aggregation on microfibre surfaces. The dispersing agent is raised to 1.0–2.0 g/L compared with conventional polyester because the larger surface area draws more dispersant out of the bath onto the dye crystal surface. A dye dosage of 0.2–1.2% owf is used for activewear base layers and cleaning cloths; above 1.2% owf the risk of thermomigration into adjacent elastane or polyurethane film increases. After-dyeing reduction clearing uses 2 g/L sodium hydrosulfite and 2 g/L sodium hydroxide at 80°C for 20 min, but the alkali concentration is not increased because microfilaments are more sensitive to surface etching. Final wet crock testing is done according to ISO 105-X12; washing fastness is checked under ISO 105-C06 C2S. For sportswear using elastane, dye migration testing at 120°C for 30 min is required to verify that no brown staining of the elastane exceeds shade change grade 4.
Competitive Disperse Brown 27 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!
CI Disperse Brown 27 is supplied as a non-ionic disperse dye preparation formulated for high-temperature exhaust dyeing, pad-thermosol fixation, continuous processing, and transfer printing of polyester and polyester-rich blends. Brand-specific model codes differ by manufacturer; the C.I. designation is the cross-reference used for procurement. The commercial preparation consists of the milled colorant dispersed in an anionic surfactant system, commonly a naphthalene sulfonate condensate or lignosulfonate. The dispersant is not inert: it contributes to dyebath stability, redispersibility after storage, and sensitivity to calcium or magnesium hardness. Incoming quality control should record tinctorial strength, shade, residual moisture, sieve residue, and dispersion behaviour against the supplier certificate of analysis. Because the dye is virtually insoluble in water, application performance depends more on particle-size distribution and dispersant condition than on nominal dye content. The dispersed product is usually adjusted to a standard strength, with the reference strength defined by the manufacturer; comparison between suppliers therefore requires dyeing trials under identical processing conditions rather than a simple weight-for-weight replacement.
For aqueous dispersion, the product should be pasted with cold water and mixed through a high-shear disperser or rotor-stator unit before addition to the main dyebath. Typical predispersion temperature is 25–40 °C, with hard water above 50 mg/L calcium carbonate equivalent requiring softened water or a dispersant-compatible sequestering agent. The performance limitation in low-liquor-ratio jet machines is foam generation and shear-induced aggregation; antifoaming agents selected for high-temperature polyester dyeing must be screened for silicone deposition on package winders or heat exchangers.
| QC parameter | Instrument or test condition | Typical acceptance window |
|---|---|---|
| Tintorial strength | Spectrophotometer vs reference dyeing at 130 °C | 95–105% relative to standard |
| Residual moisture | Halogen moisture analyzer, 105 °C | ≤5.0% for low-dusting granules |
| Sieve residue | Wet sieving through 75 µm mesh | ≤0.5% |
| Dispersion stability | ISO 105-Z11:1998 filtration test, 25 °C | No visible agglomerates after specified cycles |
When Disperse Brown 27 is selected for continuous pad-thermosol or pad-steam dyeing of polyester/cellulose blends, the dyebath stability window is set by the interaction of the dispersant system with the antimigrant and wetting agents. A typical preparation sequence involves predispersion of the dye at 25–40 °C, addition of an acrylic acid-based antimigrant or polyvinyl alcohol derivative, and adjustment of pad liquor pH to 4.5–5.5 with acetic acid. The pad mangle is operated at an expression of 60–75% on polyester/cellulose goods; higher expression improves penetration but increases migration risk during predrying. Predrying at 100–130 °C with ram-air or contact dryers must be uniform because uneven residual moisture before thermofixation produces light and dark selvedges. Fixation of the dye into polyester in a stenter frame is usually performed at 195–205 °C for 45–90 s; the lower temperature boundary is controlled by incomplete fibre swelling and diffusion, while the upper boundary is limited by thermomigration and loss of wet fastness. Reduction clearing with sodium hydrosulfite and caustic soda is carried out at 70–80 °C for 20 min to remove unfixed surface dye and improve washing fastness measured by ISO 105-C06:2010.
High-temperature exhaust dyeing of CI Disperse Brown 27 on polyester package cones requires controlled heating and circulation. The dyebath is prepared with softened water and a dispersing agent, set at 40 °C, adjusted to pH 4.5–5.5, and heated to 130 °C at 1–2 °C/min. A hold time of 30–45 min is typical for medium-depth shades; deeper shades may be held for 60 min when bath exhaustion and migration must be balanced. Package density outside 350–400 g/L may create unlevel flow and pressure differences: densities above 400 g/L often increase flow resistance and produce cone-to-cone shade variation. The liquor ratio in modern air-injection machines may be 1:8 to 1:15, and bidirectional circulation must be maintained to avoid inside-to-outside levelling faults. After dyeing, cooling to 70 °C before drain reduces oligomer precipitation and redeposition on the package surface. For deep shades, reduction clearing with hydrosulfite at 70–80 °C for 20 min is standard; omission can reduce wet fastness below the target grade established under ISO 105-C06:2010.
The dispersed state of Disperse Brown 27 is pH-dependent. Alkaline conditions above pH 8.0 may destabilize the dispersion, causing agglomeration and specking; acidic conditions below pH 4.0 may reduce the effectiveness of certain dispersants and attack cotton in blends. A buffer system based on acetic acid/acetate or formic acid is used to maintain pH 4.5–5.5 throughout the heating and holding period. In package dyeing, the dye may be exposed to reducing species from residual moisture, cotton impurities, or bacterial action in storage; such reduction can alter hue or strength. Sodium hydrosulfite-based post-clearing should be separated from the main dyebath and thoroughly rinsed to avoid residual reductant in subsequent dyeings. Water hardness should be maintained below 50 mg/L CaCO₃ equivalent because calcium and magnesium ions can react with the dispersant and reduce dispersion stability. Filterability testing according to ISO 105-Z11:1998 is used as a batch release tool for high-temperature formulations.
In transfer printing, the dye is printed onto paper by gravure or inkjet, then transferred to polyester at 205–215 °C for 20–40 s under pressure. The relative fastness profile differs from exhaust-dyed material because sublimation is part of the transfer mechanism; some dye remains on the paper, and the final shade depends on transfer temperature and contact time. Disperse Brown 27 should be tested for ink viscosity, particle size, and transfer efficiency in the selected ink system. Published data for this specific configuration is limited.
Process substitution of Disperse Brown 27 for Disperse Brown 1 or Disperse Brown 19 in existing recipes is not a direct exchange. The Colour Index designations identify the chemical distribution chain, but commercial preparations differ in dispersant content, standard strength, and particle-size distribution. When a dyehouse changes product, it should first compare the visible absorption spectrum in a suitable solvent or dispersion using a spectrophotometer; this may reveal differences in maximum absorption wavelength but does not predict particle-size behaviour. The replacement product must be evaluated for build-up, levelling, compatibility with common levelling agents, and fastness on the target substrate. Wash fastness is evaluated according to ISO 105-C06:2010, perspiration fastness according to ISO 105-E04:2013, rubbing according to ISO 105-X12:2016, and light according to ISO 105-B02:2014. If supply is intended for automotive or workwear, additional tests for sublimation (ISO 105-P01:1993), heat ageing, and dry-cleaning may be required. Published data for exact equivalence between Disperse Brown 27 and other brown disperse dyes in all marketing channels is limited; controlled trials at the production site are the only reliable basis for substitution.
For melt coloration of polyester or polyamide, CI Disperse Brown 27 is introduced as a liquid dispersion or as a pre-dispersed masterbatch. In masterbatch compounding on a twin-screw extruder with a screw L/D of 40:1, the dye should be fed through a side feeder after the polymer melt has reached a homogeneous melt temperature of 260–285 °C for polyester; a screen pack with 20–40 µm mesh elements is used to remove undispersed agglomerates. The processing risk is plate-out on the screw root, die lip, or spinneret surface. This plate-out is not only a cleaning issue; it can indicate chromophore decomposition or dispersant incompatibility with the polymer. Monitoring should include filter pressure rise over a 4–8 h production run and visual inspection of extrudate surface. Published data for this specific configuration for Disperse Brown 27 is limited, so each masterbatch formulation must be qualified for the particular polymer grade, additive package, and downstream fibre draw ratio.
Finished goods containing CI Disperse Brown 27 should be verified against the latest restricted substance list applicable to the destination market. The table below summarises the textile fastness tests normally used in laboratory release of polyester dyeings; it does not replace a full chemical compliance audit.
| Test property | Standard method | Use in release |
|---|---|---|
| Washing fastness | ISO 105-C06:2010, test C2S | Polyester and polyester/cellulose dyeings |
| Perspiration fastness | ISO 105-E04:2013 | Skin-contact garments |
| Rubbing fastness | ISO 105-X12:2016 | Dry and wet crocking |
| Light fastness | ISO 105-B02:2014, xenon arc | Apparel and furniture |
| Sublimation fastness | ISO 105-P01:1993 or AATCC 133 | Polyester garment dyeings and transfer prints |
| Dispersion stability | ISO 105-Z11:1998 | Incoming dye QC |
Store the product at 10–30 °C and below 60% relative humidity in unopened containers. Moisture ingress or storage under high humidity can cause agglomeration and loss of dispersion stability. A shelf life of 24 months from the date of manufacture is typical when the product remains in the original sealed container and away from direct sunlight. Use stainless steel or plastic equipment for predispersion; copper, brass, and iron vessels should be avoided because they can introduce redox-active metal ions that interfere with shade stability.
