+8615371019725
| HS Code | 414025 |
| Productname | Bluesail Dioctyl Terephthalate (DOTP) |
| Chemicalname | Bis(2-ethylhexyl) terephthalate |
| Synonyms | DOTP; DEHT; Dioctyl terephthalate; Bis(2-ethylhexyl) benzene-1,4-dicarboxylate |
| Casnumber | 6422-86-2 |
| Einecsnumber | 229-176-9 |
| Molecularformula | C24H38O4 |
| Molecularweight | 390.56 g/mol |
| Appearance | Colorless or pale yellow transparent oily liquid |
| Colorptco | ≤30 |
| Odor | Mild, slight characteristic odor |
| Density20c | 0.982-0.988 g/cm³ |
| Boilingpoint | 383 °C at 760 mmHg |
| Flashpoint | ≥230 °C (COC) |
| Viscosity20c | 60-80 mPa·s |
| Refractiveindex20c | 1.488-1.490 |
| Freezingpoint | ≤-45 °C |
| Puritygc | ≥99.5% |
| Acidvalue | ≤0.1 mg KOH/g |
| Watercontent | ≤0.1% |
| Volatilematter | ≤0.1% |
| Solubility | Insoluble in water; soluble in most organic solvents |
As an accredited Bluesail Dioctyl Terephthalate (DOTP) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | |
| Shipping | |
| Storage |
Bluesail Dioctyl Terephthalate (DOTP), CAS 6422-86-2, is the bis(2-ethylhexyl) ester of terephthalic acid and is applied in flexible PVC compounding as a non-ortho-phthalate plasticizer. In production-scale PVC processing, the material is added at 10–90 phr across different downstream markets; the precise loading is dictated by Shore A hardness, low-temperature brittleness, extraction resistance, and heat-aging elongation retention required in the finished article. Because DOTP has a lower solvating strength than DOP, dry-blend uptake and plastisol gelation behavior shift when converting from ortho-phthalate systems. The scenarios that follow cover only established industrial applications in which DOTP is used as a primary or co-plasticizer, and they distinguish between flexible PVC compounds prepared by dry blending and PVC plastisols prepared by high-shear mixing. All standard designations and test methods refer to specimen conditioning at 23 ± 2 °C and 50 ± 10 % relative humidity unless otherwise specified.
Compounds formulated for IEC 60227-3 PVC-insulated single-core building wire and UL 62 flexible cord constructions typically use Bluesail DOTP at 40–55 phr in insulation compounds and 50–65 phr in sheathing compounds, with the exact loading depending on PVC K-value, filler type, and required low-temperature impact resistance. The formulation range is constrained on the upper end by tensile strength loss after air-oven aging and on the lower end by brittleness at -25 °C to -40 °C. In production, the plasticizer is absorbed in a heated high-speed mixer with a batch capacity of 500–1,000 kg, discharged at 110–120 °C, then compounded in a co-rotating twin-screw extruder with L/D 28:1 to 36:1 and pelletized through a water-ring die. Insulation extrusion onto copper conductor uses a single-screw wire line with melt temperature 150–170 °C and draw-down ratio not exceeding 2.5:1 on thin-wall 0.4 mm insulation to prevent melt fracture. Finished compounds are tested under EN 50363-3:2005+A1:2011 for tensile strength, elongation at break, and oven aging at 80 °C for 7 days. Volume resistivity is determined according to IEC 62631-3-1:2016, with a minimum insulation resistance of 1 × 10^12 Ω·cm at 70 °C commonly specified for utility-grade building wire. DOTP maintains lower plasticizer volatility than DOP under thermal endurance screening, which is observed as reduced mass loss after 7 days at 100 °C in compound-level comparison. Products from this segment include building wire, appliance wiring, flexible cords, and low-voltage distribution cable.
In plants where ambient relative humidity exceeds 60 %, PVC resin and filler should be pre-dried at 60–80 °C for 2–3 hours; residual moisture above 0.15 % increases plate-out on screw elements during compounding and can reduce volume resistivity below acceptance thresholds because ionic impurities are not fully removed. The use of DOTP with calcium carbonate loadings above 40 phr in sheathing compounds may require a polymerized plasticizer or chlorinated polyethylene impact modifier to maintain elongation after heating. RoHS compliance is assessed under Directive 2011/65/EU as amended by (EU) 2015/863, and REACH obligations are managed under Regulation (EC) No 1907/2006.
Underhood and passenger cabin PVC wiring operated at conductor temperatures up to 100 °C is specified under ISO 6722-1:2011 road-vehicle cable protocols, where long-term heat aging, cold winding, and abrasion endurance are defined by test method designation rather than generic insulation thickness. Formulations for ISO 6722-1 Class A and Class B automotive cables use Bluesail DOTP at 35–45 phr in PVC insulation to balance heat aging with flexibility at -40 °C. The compound is prepared with a trimellitate co-plasticizer or a hindered phenolic antioxidant package because DOTP alone may not maintain elongation after 3,000 h at 100 °C in high-K PVC. Extrusion of thin-wall automotive wire at 0.25–0.35 mm insulation wall requires a single-screw extruder with L/D 20:1 to 30:1, screw compression ratio 2.8–3.2, and melt temperature not exceeding 160 °C to avoid early dehydrochlorination. Low-voltage automotive cables are subjected to ISO 14572:2011 for marking durability, ISO 6722-1:2011 for short-term and long-term heat ageing, and cold winding tests at -40 °C. Terminal products are engine harness wire, door harness wire, and battery cable insulation with printed legends.
Flexible PVC skins for instrument panels, door inserts, and console armrests are produced by PVC plastisol casting or slush molding with Bluesail DOTP as the primary plasticizer at 60–85 phr. The low volatility relative to DOP reduces windshield fogging as measured by ISO 6452:2007 gravimetric fogging, where automotive OEM thresholds commonly require condensate below 2 mg at 100 °C for 16 h. Plastisol gelation and fusion are affected by the solvating strength of DOTP; with DOTP, a typical high-speed dissolver pre-gel at 60 °C for 30 min, followed by fusion in a hot-air oven at 190–205 °C for 60–90 s, produces a Shore A hardness of 55–70 depending on filler and K-value. VDA 278:2011 thermodesorption analysis is used to screen raw materials for volatile organic compounds and fogging condensables, and DOTP-containing skins are evaluated for tensile strength and tear strength under ISO 37:2017 after heat aging at 120 °C for 500 h. Production equipment for slush molding includes nickel-shell tools heated to 230–250 °C and cooling stations with controlled demolding temperature below 70 °C. Terminal products include instrument panel skins, door trim, console covers, and headrest covers.
Luxury vinyl tile and multilayer resilient floor coverings made with Bluesail DOTP at 20–35 phr in the wear layer and up to 45 phr in the foamed core must meet EN 649:2011 and ISO 10582:2017 for dimensional stability, residual indentation, and abrasion resistance. Unlike high-plasticizer calendering, rigid core SPC lines use DOTP at 10–15 phr only where process plasticization is required for extruder torque reduction, because excessive plasticizer depresses heat deflection and stone-polymer composite rigidity. Wear-layer film is calendered at 150–170 °C, then laminated onto printed film and backing in a hot press at 120–140 °C with specific pressure 12–18 MPa. Abrasion resistance is measured by EN 660-1:1999, and plasticizer migration into adhesives is evaluated by weight change after contact with a polystyrene or acrylic adhesive under a defined load for 72 h at 50 °C. Products from this segment include luxury vinyl tile, SPC flooring, vinyl sheet flooring, and wall coverings.
Transfer coating and direct coating of polyester or cotton knitted fabric with DOTP plastisol require a solvent-free formulation with Bluesail DOTP at 70–90 phr and a calcium-zinc stabilizer package. The plastisol is applied by knife-over-roll at coat weights of 300–600 g/m², gelled at 150–170 °C, fused at 190–210 °C, and embossed on-line at 130–150 °C. For automotive seating, the finished coated fabric must pass ISO 105-B02:2014 for lightfastness, ISO 6452:2007 fogging, and ISO 5470-1:2016 Martindale abrasion. The selection of DOTP over DOP reduces plasticizer volatilization during extended heat exposure, but DOTP does not by itself provide UV stabilization; benzotriazole or hindered amine light stabilizers are added separately for exterior tarpaulin and seating exposed to direct sunlight. Terminal product types include automotive seating, furniture upholstery, handbags, and technical tarpaulins.
Flexible PVC medical tubing and film made with Bluesail DOTP as a non-ortho-phthalate alternative to DEHP is formulated at 40–70 phr, with higher addition in tubing and lower addition in monolayer film for blood bag or oxygenator applications. The final device must be tested under ISO 10993-1:2018 for biological evaluation planning, ISO 10993-5:2009 for in vitro cytotoxicity, and ISO 10993-10:2010 for irritation and skin sensitization, as well as USP <87> and <88> Class VI where required by the submission pathway. DOTP has a different migration profile in PVC than DEHP; extraction testing with saline, ethanol/water, and lipid simulants under ISO 10993-12:2021 is required because plasticizer migration can be influenced by sterilization modality. Steam sterilization, ethylene oxide sterilization, and gamma irradiation at 25–50 kGy alter extractables profiles differently, so the final device-specific extractables data package must be generated rather than inferred from raw-material toxicity data alone. Tubing is extruded on a single-screw extruder with L/D 24:1 to 30:1, melt temperature 160–175 °C, and pulled through a vacuum cooling tank to control ovality below 0.1 mm on 3–5 mm OD lines. Blood bags are produced by blown film or cast film extrusion, then high-frequency welded; seal strength is measured per ISO 3826-1:2019. End products include infusion lines, extension sets, enteral feeding tubes, and blood bags where the manufacturer holds appropriate regulatory clearances under MDR (EU) 2017/745. Published production-scale data for DOTP across all sterilization modalities remains limited, and qualification studies must be conducted on the final device.
PVC sealing profiles and gaskets compounded with DOTP at 50–80 phr are produced by single-screw extrusion with a breaker plate and screen pack, melt temperature 145–160 °C, and a calibration sleeve for dimensional control of complex profiles. The plasticizer level is set by the compression set requirement under ASTM D395-18 Method B after 22 h at 70 °C; compression set degrades when plasticizer is too high because plasticizer migration and polymer chain slippage increase permanent deformation. Extraction resistance is evaluated by ISO 176:2005 activated-carbon method for volatile loss, and tensile properties after oil or detergent immersion are tested according to ASTM D638-14 before and after exposure. High-filler industrial compounds containing DOTP above 70 phr may require a vented barrel or a two-stage screw to prevent volatiles from generating surface porosity during profile extrusion. Terminal product types include appliance gaskets, window weatherstripping, industrial seals, and flexible PVC profiles used in wastewater drainage systems.
Competitive Bluesail Dioctyl Terephthalate (DOTP) prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615371019725 or mail to sales7@alchemist-chem.com.
We will respond to you as soon as possible.
Tel: +8615371019725
Email: sales7@alchemist-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Bluesail Dioctyl Terephthalate (DOTP), CAS 6422-86-2 and EC number 229-351-3, is a non-ortho-phthalate plasticizer produced by esterification of purified terephthalic acid with 2-ethylhexanol. The commercial material is supplied as a clear, water-white liquid with molecular formula C24H38O4 and nominal molecular weight 390.56 g/mol. Bluesail DOTP is the commercial designation applied to standard bulk deliveries; no separate model suffix is assigned to the general-purpose grade. The product is transported in 200 L epoxy-phenolic lined drums, 1000 L intermediate bulk containers, or stainless-steel tank cars maintained under nitrogen blanket. In flexible polyvinyl chloride (PVC) compounds, DOTP functions as a general-purpose plasticizer where lower volatility and absence of the ortho-phthalate diester group are required relative to bis(2-ethylhexyl) phthalate (DOP).
Release specifications for Bluesail DOTP align with general-purpose non-phthalate plasticizer requirements for cable, flooring, film, and seal compounds. The para-disubstituted terephthalate structure imparts a measurable difference in solvating strength relative to ortho-phthalate plasticizers, but the controlled composition remains within narrow lot-to-lot ranges. A representative certificate of analysis includes the parameters shown in Table 1.
| Property | Release limit or typical value | Test method |
|---|---|---|
| Ester content | ≥99.5% | Internal GC-FID normalization |
| Acid value | ≤0.02 mg KOH/g | ISO 2114:2000 |
| Water content | ≤0.05% | ISO 760:1978 |
| Color, platinum-cobalt | ≤20 | ISO 6271:2015 |
| Density at 20°C | 0.984 g/cm³ | ASTM D4052-22 |
| Dynamic viscosity at 25°C | 61–65 mPa·s | ISO 3105:1994 |
| Refractive index nD20 | 1.488–1.490 | ASTM D1218-21 |
| Flash point, Cleveland open cup | ≥230°C | ISO 2592:2017 |
Residual 2-ethylhexanol content is typically controlled below 20 mg/kg by gas chromatography because free alcohol contributes to volatile organic compound emissions from finished PVC flooring and interior film. The low moisture limit is required for plastisol viscosity stability; hydrolytic degradation is not the primary concern, but water contamination produces haze at low storage temperatures and can interfere with fusion in high-speed dry-blend mixing.
The product remains pumpable in unheated outdoor storage at 0°C, although dynamic viscosity increases to approximately 200–250 mPa·s. Storage tanks constructed of mild steel, stainless steel, or aluminum are acceptable. Prolonged contact with copper alloys should be avoided because trace copper can accelerate peroxide formation in the ester. Bulk storage under dry air or nitrogen with moisture exclusion is specified for maintaining water content below 0.05%.
DOTP is evaluated as a replacement for DOP or DEHP in flexible PVC because it does not contain the ortho-phthalate diester group. Under REACH Annex XVII entry 51, bis(2-ethylhexyl) phthalate is restricted when present above 0.1% by weight in plasticized material for many consumer articles. DOTP is outside the structural definition and is not assigned a harmonized classification as a category 1B reproductive toxicant under CLP Regulation (EC) No 1272/2008. In the European Union, DOTP is listed in Commission Regulation (EU) No 10/2011 with a specific migration limit of 60 mg/kg in food simulant. This regulatory position supports substitution in toys, childcare articles, food-contact gaskets, and medical packaging where ortho-phthalate restrictions prevent the use of DOP.
Performance comparison with DOP is close because both esters share the same molecular weight and similar density, but DOTP’s para orientation raises Brookfield viscosity and reduces vapor pressure. Equal-phr substitution in flexible PVC often produces Shore A hardness within 1–2 points and low-temperature flex temperature by ASTM D1043-16 within 3–5°C of DOP. Where a formulation requires exact hardness duplication, a 2–4 phr upward adjustment is common. The comparative data in Table 2 summarize the main differences among DOTP, DOP, and DINP.
| Parameter | Bluesail DOTP | DOP / DEHP | DINP |
|---|---|---|---|
| CAS number | 6422-86-2 | 117-81-7 | 68515-48-0 |
| Molecular weight | 390.56 | 390.56 | 418.6 |
| Density at 20°C | 0.984 | 0.985 | 0.973 |
| Dynamic viscosity at 25°C | 61–65 mPa·s | 54–58 mPa·s | 70–80 mPa·s |
| Flash point, Cleveland open cup | 231–238°C | 218–225°C | 220–230°C |
| Annex XVII phthalate restriction | Not listed under entry 51 or 52 | Restricted above 0.1% under entry 51 | Restricted above 0.1% in toys and childcare articles under entry 52 |
Low-temperature flexibility of DOTP-plasticized PVC at 70 phr is typically 3–5°C poorer than DOP when measured by ASTM D1043-16 Clash-Berg method. This trade-off is generally acceptable in cable sheathing, edge trim, and gasket applications where the priority is low volatility and regulatory status rather than extreme cold flex.
Volatility weight loss measured by activated carbon method ISO 176:2005 at 100°C for 24 h is reported below 0.5% for DOTP-plasticized PVC at 70 phr, whereas DOP formulations under the same conditions typically lose 0.8–1.1%. The difference becomes significant in 105°C wire insulation because long-term plasticizer evaporation in air-oven aging correlates with embrittlement. Retention after 168 h at 100°C in a forced-air oven, evaluated using IEC 60811-401:2012, is a pass/fail requirement for many cable sheathing specifications. Compounds using DOTP retain elongation at break above 200% after aging where DOP compounds can fall below 150% at equivalent formulation composition.
Solvent extraction resistance measured by ISO 6427:2013 in n-hexane at 23°C for 24 h is approximately 20–25% weight loss for DOTP-PVC, compared with 28–35% for DOP-PVC. This supports gasket and seal applications where incidental oil contact occurs. Published data for specific food-contact configurations is limited; therefore, migration testing under the intended food simulant is required when a finished article is to be certified under Commission Regulation (EU) No 10/2011.
DOTP is incompatible with some solvent-borne acrylic topcoats and certain screen-printing inks because low levels of plasticizer at the PVC surface can reduce adhesion. In such constructions, adhesion testing should be performed using ISO 2409:2020 cross-cut method after 72 h room-temperature conditioning. Formulators should also avoid combining DOTP with copper-based heat stabilizers under prolonged high-shear processing, as copper residues can increase oxidative color development measured as platinum-cobalt color after heat aging.
In high-speed mixer dry-blend lines for PVC cable compound, DOTP absorption onto K-value 70 suspension resin is slower than DOP below 90°C. Mixer trials show that plasticizer temperature of 55–65°C and final dry-blend discharge temperature of 120–125°C produce free-flowing powder. Batch-to-batch variance in plasticizer uptake is minimized by controlling injection droplet size to 200–300 µm. On a counter-rotating twin-screw extruder with L/D 44:1, screw speeds of 180–220 rpm, and barrel temperatures of 140–160°C, the gelation onset shifts 5–8°C higher relative to DOP. This requires either a slightly higher barrel temperature or a 2–5 phr increase to maintain the same fusion degree, as monitored by Brabender torque rheometry.
Production-scale extrusion of DOTP-plasticized cable bedding compounds with 50 phr DOTP has shown melt pressure at the die of 8–12 MPa depending on screw configuration; breaker plate pressure fluctuations remain within ±0.5 MPa when pre-blend temperature is held constant. Plastisol formulations at 60 phr in K-value 70 resin yield initial Brookfield viscosity near 2000–3000 mPa·s. Viscosity stability after 24 h at 23°C is typically within ±10%, making the product suitable for coating and dipping compounds when viscosity depressants are included to control the onset of solvation.
On calendering lines, plasticizer migration to the roll bank is reduced because DOTP has lower vapor pressure than DOP. Release from polished chrome rolls is maintained with less process aid; however, the melting of PVC primary particles occurs later, so roll temperatures should be raised by 3–5°C relative to DOP formulations. At ambient relative humidity above 60%, dry blends containing DOTP should be processed within 8 h to avoid caking because the slower absorption leaves more free plasticizer available to bridge resin particles under moisture uptake.
Formulations with DOTP above 75 phr in flexible PVC can show exudation after 96 h under compression at 23°C. This compatibility limit is more restrictive than DOP in filled compounds containing calcium carbonate above 40 phr. For such highly plasticized or highly filled recipes, preliminary compatibility testing by pressing a 2 mm sheet between absorbent paper layers at 50°C for 72 h is recommended before full production release.
Professional chemical manufacturer delivering high-quality products with advanced production technology and globally recognized quality standards.
