Oxybenzone
CAS Number
131-57-7
EC Number
205-031-5
What is Oxybenzone?
Oxybenzone (CAS 131-57-7), also marketed as Uvinul M40 and Benzophenone-3, is a UV-absorbing compound that protects materials from photodegradation.
Where is Oxybenzone used?
- Personal care: active UV filter in sunscreens, lotions, creams and lip products
- Coatings and varnishes: prevents yellowing and surface degradation in architectural and industrial finishes
- Polymers: added during compounding to extend service life of films, profiles and molded components
- Adhesives and sealants: maintains bond integrity and appearance under prolonged sunlight
- It protects formulations from damage caused by UVB and UVA radiation.
Commercial specifications
- Packaging: fiber drums and multi-layer bags; bulk quantities for industrial procurement
Other Names (Synonyms)
Uvinul M40|Benzophenone-3|4-Methoxy-2-hydroxybenzophenone butyric acid|4-Methoxy-2-hydroxybenzophenone|2-Benzoyl-5-methoxyphenol|(2-Hydroxy-4-methoxyphenyl)phenylmethanone|2-Hydroxy-4-methoxybenzophenone|Advastab 45
What are the physical properties of Oxybenzone?
Melting Point 66 °C
Boiling Point 370 °C
Density 1,3 g/cm 3
Flash Point 216°C
Appearance white to light yellow crystalline powder
Color White to light yellow
Odor ylsh. cryst., rose-like odor
Form Crystalline Powder
Water Solubility <0.1 g/100 mL at 20 ºC
Vapor Pressure 0.001Pa@25°C
Refractive Index 1.5805 (estimate)
Log P 3.45 at 40℃
How is Oxybenzone classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard GHS08· Health Hazard
Hazard Statements
H315 Causes skin irritation
H317 May cause an allergic skin reaction
H319 Causes serious eye irritation
H335 May cause respiratory irritation
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
Which trade and regulatory codes apply to Oxybenzone?
HS Code 29145000
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 13 - Non Combustible Solids
WGK (Germany) 2