Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide-Shandong Huashang Chemical Co., Ltd.

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Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide

Brand：HS

Model：25kg/drum

Purity：99%

Cas：75980-60-8

Createtime： 2026-04-14
Updatetime： 2026-04-15

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Product Details

useage	Industrial use
deliveryInfo
appearance	powder
Molecular Weight	348.37
aliasen
supplyCapacity	50000MT/Month
harbor	Qingdao,China
minorder	1KG
Appearance	White to pale yellow crystalline powder

Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and sales of fine chemicals. Headquartered in Jinan, Shandong, China, we are committed to delivering high-quality products to our global partners. Currently, over 90% of our products are exported to developed markets, including North America, Europe, Japan, South Korea, and the Middle East.

Basic Information

Product Name: Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide

Alias: TPO; (2,4,6-Trimethylbenzoyl)diphenylphosphine oxide; (Diphenylphosphoryl)(mesityl)methanone; Darocur TPO; Irgacure TPO; 2,4,6-Trimethylbenzoyldiphenylphosphine oxide; MFCD00192110

CAS No.: 75980-60-8

EINECS No.: 278-355-8

Molecular Formula: C??H??O?P

Molecular Weight: 348.37 g/mol

Classification: Type I photoinitiator, organic phosphorus compound, fine chemical, pharmaceutical intermediate, material additive

Physical & Chemical Properties

Appearance: White to pale yellow crystalline powder or crystal, with no obvious peculiar odor, may appear light yellow to yellow-green in some specifications

Density: 1.03–1.218 g/cm3 at 20 °C (estimate)

Melting Point: 88–94 °C (lit.), typical 91–95 °C for industrial grade

Boiling Point: 519.6 ± 60.0 °C (predicted), >250 °C under normal pressure

Vapor Pressure: Negligible at room temperature

UV Absorption Maximum: ~350–420 nm, additional absorption peaks at 273 nm, 370 nm

Solubility: Insoluble in water (water solubility ca. 0.011 g/L at 20 °C); soluble in methanol, toluene, acetone, most monomers, oligomers and prepolymers; compatible with common organic solvents used in coating and ink industries

Purity: ≥98.0% (HPLC), ≥97.0% available for industrial grade, ≥99.0% available for high-purity research use

Storage Condition: Sealed, dry and dark place; room temperature storage is acceptable, recommended storage below 15 °C for long-term preservation; avoid direct light (light-sensitive), high temperature (stable below 180 °C), and incompatible substances; store locked up, avoid release to the environment

Main Uses

UV Curing Field: As a highly efficient Type I photoinitiator, it absorbs UV and near-visible light to generate free radicals that initiate polymerization, with excellent through-cure ability and low yellowing property. It is widely used in UV-curable coatings (wood coatings, furniture coatings, electronic component protective coatings), printing inks, and adhesives, especially suitable for white pigmented systems and thicker clear coatings.
3D Printing & Biomedical Fields: Used in resin-based 3D printing processes to produce detailed and durable objects, and in the photo-crosslinking of PMMA composites for organic thin film transistor (OTFT) gate insulators. It is also applied in dental composites and adhesives that require quick setting times and strong adhesion.
Other Fields: As an organic intermediate, it is used in the photoinduced synthesis of organophosphine compounds, which can serve as ligands for metal catalysts and reagents. It is also used as a processing aid, light-transmissive fiber coating additive, and in the research and development of new photoinitiator formulations and material modification technologies.

Specification Table

Item	Specification	Unit	Remarks
Product Name	Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide	—
CAS Number	75980-60-8	—	EINECS: 278-355-8; MFCD00192110
Molecular Formula	C??H??O?P	—	Organic phosphorus compound (Type I photoinitiator)
Molecular Weight	348.37	g/mol
Appearance	White to pale yellow crystalline powder	—	May be light yellow to yellow-green; crystal form available
Purity	≥98.0 (≥97.0, ≥99.0 available)	%	HPLC; ≥97.0% for industrial grade
Melting Point	88-94	℃	lit.; 91-95℃ for industrial grade
Solubility	Insoluble in water, soluble in methanol, toluene	—	Water solubility ca. 0.011 g/L; light-sensitive