2,4-dihydroxybenzophenone
CAS Number
131-56-6
EC Number
205-029-4
Abbreviation
DHBP
What is 2,4-dihydroxybenzophenone?
2,4-Dihydroxybenzophenone (CAS 131-56-6), also known commercially as Uvinul 400 and abbreviated as DHBP, is a UV absorber used to protect polymers, coatings, and personal care formulations from photodegradation.
Where is 2,4-dihydroxybenzophenone used?
- Coatings and industrial paints: extends service life of exterior finishes
- Plastics: added to polyolefins, PVC, and engineering resins for long-term outdoor durability
- Printing inks and packaging films: stabilizes colorants and substrates against UV fading
- Personal care: UV filter in sunscreens and hair care products
- UV-curable adhesives and sealants: photoinitiator and cross-linking agent
- It absorbs UV radiation in the 280–340 nm range, preventing premature breakdown of the host material.
Commercial specifications
- Purity levels typically at 99% or higher
Other Names (Synonyms)
(2,4-dihydroxyphenyl)(phenyl)methanone|Inhibitor DHBP|Uvinul 400|Advastab 48|Uvistat 12|Quinsorb 010|Syntase 100|Methanone, (2,4-dihydroxyphenyl)phenyl-|DHBP
What are the physical properties of 2,4-dihydroxybenzophenone?
Melting Point 142 °C
Boiling Point 194 °C @ Press: 1 Torr
Density 1,32 g/cm 3
Flash Point 125 °C
Appearance yellow crystalline powder
Color Yellow
Form Crystalline Powder
Water Solubility insoluble
Vapor Pressure 0Pa at 25℃
Refractive Index 1.5090 (estimate)
pH 5 (10g/l, H2O, 20℃)(slurry)
Log P 2.964 at 25℃
How is 2,4-dihydroxybenzophenone classified and handled safely? Learn More
Warning
GHS07· Irritant
Hazard Statements
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
Precautionary Statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
Which trade and regulatory codes apply to 2,4-dihydroxybenzophenone?
HS Code 29145000
Storage Class 11 - Combustible Solids
WGK (Germany) 2