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Triisobutyl Phosphate (TIBP) is a neutral organophosphorus compound belonging to the trialkyl phosphate ester family.
Triisobutyl Phosphate (TIBP) contains three branched isobutyl groups attached through oxygen atoms to a phosphate center and is supplied as a low-viscosity liquid.
Triisobutyl Phosphate (TIBP) serves as a defoamer, formulation solvent, processing auxiliary, and specialty plasticizer in selected industrial systems.
CAS Number: 126-71-6
EC Number: 204-798-3
Molecular Formula: C₁₂H₂₇O₄P
Molecular Weight: 266.31 g/mol
Synonyms: Triisobutyl phosphate, Tri-isobutylphosphate, Tris(2-methylpropyl) phosphate, Phosphoric acid triisobutyl ester, Phosphoric acid, tris(2-methylpropyl) ester, 2-Methylpropyl di(2-methylpropyl) phosphate, TIBP, CAS 126-71-6, EINECS 204-798-3, PubChem CID 31355, UNII 6MKE1AR3GB, NSC 62222, CHEBI:189140, CHEMBL1887508, DTXSID8040698, HRKAMJBPFPHCSD-UHFFFAOYSA-N, Triisobutyl Phosphate, Tri-Isobutyl Phosphate, Tri Isobutyl Phosphate, Triiso Butyl Phosphate, Triisobutylphosphate, Tri-Isobutylphosphate, Tri-Iso-Butyl Phosphate, Tri-Iso-Butylphosphate, Tris-Isobutyl Phosphate, Tris-Isobutylphosphate, TIBP, TiBP, Isobutyl Phosphate, Isobutylphosphate, Isobutyl Phosphate ((C4H9O)3PO), Tris(2-Methylpropyl) Phosphate, Tris (2-Methylpropyl) Phosphate, Phosphoric Acid Tris(2-Methylpropyl) Ester, Phosphoric Acid Tris(2-Methylpropyl) Ester, Phosphoric Acid Tris (2-Methylpropyl) Ester, Phosphoric Acid Triisobutyl Ester, Phosphoric Acid Triisobutyl Ester, Phosphoric Acid Tri-Isobutyl Ester, Phosphoric Acid Tri-Iso-Butyl Ester, Orthophosphoric Acid Triisobutyl Ester, Orthophosphoric Acid Tri-Isobutyl Ester, Phosphate de Triisobutyle, Phosphorsäure-Tri-Isobutylester, Triisobutylphosphat, Triizobutil Fosfat, Triizobütil Fosfat, Triizobütilfosfat, Tri-Izobütil Fosfat, Fosforan Triizobutylu, Phosphoric Acid Triisobutyl Ester (8CI), 2-Methylpropyl Di(2-Methylpropyl) Phosphate, 2-Methylpropyl Di-2-Methylpropyl Phosphate, Triisobutyl Orthophosphate, Triisobutyl Ester of Phosphoric Acid, Triisobutyl Ester of Orthophosphoric Acid, CAS 126-71-6, EC 204-798-3, EINECS 204-798-3, UNII 6MKE1AR3GB, UNII-6MKE1AR3GB, PubChem CID 31355, DTXSID8040698, DSSTox CID 20698, DSSTox RID 79549, DSSTox GSID 40698, CHEMBL1887508, MFCD00039849, NSC 62222, NSC-62222, AI3-07850, BRN 1710574, Beilstein 1710574, Beilstein Reference 4-01-00-01598, SCHEMBL133326, NCGC00164020-01, NCGC00255412-01, AC1L1LGT, CTK0H6003, ZINC01691056, ZINC1691056, Tox21_301244
APPLICATIONS
Triisobutyl Phosphate (TIBP) functions as a defoaming ingredient in concrete admixtures, including formulations based on lignosulfonate plasticizers.
Triisobutyl Phosphate (TIBP) helps control unwanted foam introduced during admixture manufacture, handling, and incorporation into cementitious mixtures.
Triisobutyl Phosphate (TIBP) contributes to air-content management when its compatibility and dosage are appropriate for the admixture system.
Triisobutyl Phosphate (TIBP) requires evaluation alongside intentional air-entraining ingredients because excessive foam suppression can interfere with the specified air-void characteristics.
Triisobutyl Phosphate (TIBP) serves as a silicone-free defoaming ingredient in selected paints and coating formulations.
Triisobutyl Phosphate (TIBP) helps reduce foam generated during mixing, circulation, and application when adequately distributed within the coating.
Triisobutyl Phosphate (TIBP) can support film uniformity by limiting defects associated with persistent entrained bubbles.
Triisobutyl Phosphate (TIBP) must be assessed for resin compatibility, surface appearance, and film properties because defoaming performance alone does not establish overall coating suitability.
Triisobutyl Phosphate (TIBP) provides foam suppression in selected industrial detergent and cleaner formulations.
Triisobutyl Phosphate (TIBP) can help control excessive foam where agitation or recirculation makes persistent bubbles undesirable.
Triisobutyl Phosphate (TIBP) offers an organic phosphate ester option for formulations requiring a silicone-free foam-control ingredient.
Triisobutyl Phosphate (TIBP) selection depends on compatibility with the detergent surfactants and on performance under the intended dilution and cleaning conditions.
Triisobutyl Phosphate (TIBP) contributes to textile auxiliaries as a defoaming and processing ingredient.
Triisobutyl Phosphate (TIBP) helps manage foam in suitable textile treatment systems containing surface-active components.
Triisobutyl Phosphate (TIBP) can accompany other auxiliary ingredients where controlled wetting and foam behavior are important to processing consistency.
Triisobutyl Phosphate (TIBP) requires assessment against the particular fiber, treatment bath, and finishing requirements before adoption.
Triisobutyl Phosphate (TIBP) finds application in paper and cardboard production auxiliaries, including paper-coating formulations.
Triisobutyl Phosphate (TIBP) contributes foam-control functionality during preparation and handling of suitable coating compositions.
Triisobutyl Phosphate (TIBP) can also serve as a pasting or wetting auxiliary within compatible formulations.
Triisobutyl Phosphate (TIBP) must be evaluated for its effects on coating uniformity, binder compatibility, and the intended properties of the finished paper.
Triisobutyl Phosphate (TIBP) is incorporated into selected glue and adhesive formulations as a processing auxiliary.
Triisobutyl Phosphate (TIBP) can contribute defoaming, wetting, or solvency functions according to the adhesive chemistry.
Triisobutyl Phosphate (TIBP) may be formulated with emulsifiers when incorporation into an aqueous adhesive requires improved distribution.
Triisobutyl Phosphate (TIBP) suitability depends on maintaining adhesion, drying behavior, and bond performance alongside the desired processing benefit.
Triisobutyl Phosphate (TIBP) has established application as a flame-retardant plasticizer in selected plastic formulations.
Triisobutyl Phosphate (TIBP) combines phosphate ester functionality with an organic liquid structure capable of modifying compatible polymer systems.
Triisobutyl Phosphate (TIBP) requires formulation-specific assessment of plasticization, additive retention, and mechanical properties.
Triisobutyl Phosphate (TIBP) does not by itself establish a fire-performance rating, which must be demonstrated for the complete finished formulation.
Triisobutyl Phosphate (TIBP) serves as a solvent or formulation component in selected hydraulic fluids and lubricant systems.
Triisobutyl Phosphate (TIBP) brings polar phosphate ester functionality and relatively low ambient-temperature volatility to compatible fluid blends.
Triisobutyl Phosphate (TIBP) application requires assessment of seal compatibility, viscosity, thermal behavior, and the complete additive package.
Triisobutyl Phosphate (TIBP) should only be assigned hydraulic or lubricant performance claims supported by testing of the finished fluid.
DESCRIPTION
Triisobutyl Phosphate (TIBP) is the triester formed conceptually from phosphoric acid and isobutanol.
Triisobutyl Phosphate (TIBP) contains three 2-methylpropoxy groups and a phosphoryl oxygen, with no remaining acidic phosphate hydroxyl group.
Triisobutyl Phosphate (TIBP) is a structural isomer of tri-n-butyl phosphate, which has straight-chain butyl groups and a different CAS number.
Triisobutyl Phosphate (TIBP) must therefore be identified independently rather than assigned the applications or hazard classifications of another butyl phosphate ester.
Triisobutyl Phosphate (TIBP) normally appears as a colorless to light yellow liquid at room temperature.
Triisobutyl Phosphate (TIBP) remains fluid at low temperatures and has a reported freezing or melting point around −60°C.
Triisobutyl Phosphate (TIBP) has a high boiling temperature and a low vapor pressure near room temperature.
Triisobutyl Phosphate (TIBP) is nevertheless combustible, and strong heating can produce an ignitable vapor–air mixture.
Triisobutyl Phosphate (TIBP) has limited water solubility despite the polarity of its phosphate ester group.
Triisobutyl Phosphate (TIBP) can require emulsifiers or other formulation aids for effective distribution in aqueous systems.
Triisobutyl Phosphate (TIBP) commercial preparations containing such aids have properties that differ from those of the neat ester.
Triisobutyl Phosphate (TIBP) should consequently be distinguished from self-emulsifying defoamer blends containing additional surfactants.
Triisobutyl Phosphate (TIBP) technical grades can differ in assay, color, water content, residual acidity, and trace impurities.
Triisobutyl Phosphate (TIBP) is classified as a skin sensitizer in established safety documentation, making repeated skin exposure an important occupational concern.
Triisobutyl Phosphate (TIBP) also receives a chronic aquatic hazard classification in some regional notifications and supplier documentation.
Triisobutyl Phosphate (TIBP) handling and labeling must follow the current regional SDS, and technical-grade availability does not establish suitability for food, pharmaceutical, cosmetic, or medical applications.
PROPERTIES
Product Name: Triisobutyl Phosphate (TIBP)
Common Name: Triisobutyl phosphate
IUPAC Name: Tris(2-methylpropyl) phosphate
Index Name: Phosphoric acid, tris(2-methylpropyl) ester
Common Abbreviation: TIBP
Chemical Family: Organophosphorus compounds
Functional Class: Neutral trialkyl phosphate ester
CAS Number: 126-71-6
EC Number: 204-798-3
PubChem CID: 31355
UNII: 6MKE1AR3GB
DSSTox Identifier: DTXSID8040698
InChIKey: HRKAMJBPFPHCSD-UHFFFAOYSA-N
Molecular Formula: C₁₂H₂₇O₄P
Condensed Structural Formula: OP[OCH₂CH(CH₃)₂]₃
SMILES: CC(C)COP(=O)(OCC(C)C)OCC(C)C
Molecular Weight: 266.31 g/mol
Physical State: Liquid
Appearance: Colorless to light yellow
Odor: Characteristic; intensity is grade dependent
Purity: Grade dependent; high-purity synthesis grades are available
Representative Melting or Freezing Point: Approximately −60°C
Representative Atmospheric Boiling Point: Approximately 272–280°C; some documentation reports decomposition
Representative Density: Approximately 0.965 g/cm³ at 20°C
Representative Dynamic Viscosity: Approximately 5 mPa·s at 20°C
Representative Vapor Pressure: Approximately 0.002 hPa at 20°C
Representative Water Solubility: Approximately 0.264 g/L at 25°C
Representative Log Pow: Approximately 3.72 at 25°C
Representative Flash Point: Approximately 132.5–133°C, closed cup
Representative Autoignition Temperature: Approximately 428–430°C
Primary Industrial Functions: Defoaming ingredient, solvent, processing auxiliary, and specialty plasticizer
Major Applications: Concrete admixtures, coatings, industrial cleaners, textile auxiliaries, paper coatings, adhesives, plastics, and selected hydraulic or lubricant formulations
GHS Classification: Skin Sensitization Category 1; Aquatic Chronic Category 3 where assigned by the applicable regional SDS
Hazard Statement H317: May cause an allergic skin reaction
Hazard Statement H412: Harmful to aquatic life with long lasting effects, where assigned
Signal Word: Warning in the cited sensitization classification
Incompatible Materials: Strong oxidizing agents
Hazardous Combustion Products: Carbon oxides, phosphorus oxides, and potentially hazardous fumes
UN Number: Not assigned for neat grades classified as non-dangerous goods
Transport Class: Generally not classified as dangerous goods under ADR/RID, IMDG, or IATA; verify the supplied grade
Packing Group: Not assigned where transported as non-dangerous goods
Storage Conditions: Tightly closed containers in a cool, ventilated area away from ignition sources and incompatible chemicals
Shelf Life: Grade, purity, packaging, storage conditions, and manufacturer dependent
Regulatory Suitability: Exact grade, intended application, and applicable requirements determine suitability.
FIRST AID
Inhalation:
Move the exposed person to fresh air.
Seek medical attention if symptoms persist or breathing becomes difficult.
Obtain emergency assistance for severe breathing impairment.
Skin Contact:
Remove contaminated clothing immediately and wash affected skin thoroughly with water and soap.
Seek medical advice if itching, redness, swelling, or a rash develops.
Wash contaminated clothing before reuse because allergic skin reactions may follow exposure.
Eye Contact:
Immediately rinse with plenty of clean water, holding the eyelids open.
Remove contact lenses if present and easy to remove, and continue rinsing.
Obtain medical attention if pain, redness, or visual disturbance persists.
Ingestion:
Rinse the mouth if the person is conscious and seek medical advice promptly.
Do not induce vomiting.
Never give anything by mouth to an unconscious person.
Note to Physicians:
Treat symptomatically and assess the exposure route and quantity.
Consider skin sensitization where dermatitis or a delayed rash follows exposure.
Provide the exact grade-specific SDS to the treating clinician.
HANDLING AND STORAGE
Handling:
Prevent skin contact and avoid breathing mist or vapor.
Use controlled transfer methods to minimize splashing.
Wash hands after handling and keep contaminated work clothing out of clean areas.
Engineering Controls:
Use closed transfer or local exhaust where aerosols or heated vapors may develop.
Provide accessible eyewash and emergency washing facilities.
Personal Protection:
Wear protective gloves selected from chemical-resistance and breakthrough data.
Use safety goggles and protective clothing appropriate to the exposure.
Add a face shield where significant splashing is possible.
Respiratory Protection:
Use suitable respiratory protection when ventilation cannot adequately control vapor or aerosol exposure.
Select equipment through a workplace exposure assessment.
Fire and Static Control:
Keep Triisobutyl Phosphate (TIBP) away from flames, sparks, and strong heating.
Control static discharge during transfers where an ignitable atmosphere could develop.
Assess ventilation and electrical-equipment requirements for heated operations or blends containing more volatile solvents.
Storage:
Keep containers tightly closed in a cool, ventilated location.
Follow the storage-temperature range specified for the supplied grade.
Protect against contamination and separate from strong oxidizing agents.
Material Compatibility:
Verify compatibility of tanks, seals, hoses, and transfer equipment with Triisobutyl Phosphate (TIBP) and the complete formulation.
Do not assume compatibility from experience with another phosphate ester.
Spill and Leak Procedures:
Restrict access and wear suitable protective equipment.
Contain spills and recover liquid or absorb with compatible inert material.
Place residues in labeled containers for appropriate disposal.
Environmental Precautions:
Prevent uncontrolled discharge to drains, soil, groundwater, or surface water.
Contain contaminated wash water and firefighting runoff.
Fire Response:
Use dry chemical, carbon dioxide, or suitable foam according to the fire conditions.
Firefighters should wear self-contained breathing apparatus.
Avoid combustion fumes, which can contain carbon and phosphorus oxides.
Waste Disposal:
Dispose of residues, contaminated absorbents, and packaging through an authorized waste-management route.
Determine waste classification from the complete composition and applicable local rules.
Do not dispose of concentrated Triisobutyl Phosphate (TIBP) through drainage systems.
