Eversorb® 51 is a strong, broad UV light absorber with excellent compatibility with polymers. Its chemical name is 2,2’,4,4’-tetrahydroxybenzophenone, and it belongs to the phenols and phenolics family.Eversorb® 51 helps prevent yellowing, embrittlement, and mechanical property degradation of polymers under light exposure, ensuring enhanced durability and stability. It is compatible with polycarbonates (PC) and polyethylene terephthalate (PET), and is available in powder form. This UV absorber offers good non-yellowing properties and excellent overall compatibility. The product is yellow in color.

Chemical Family: Phenols & Phenolics

Compatible Polymers & Resins: Polycarbonates (PC), Polyethylene Terephthalate (PET)

Features: Excellent Compatibility, Good Non-Yellowing Properties, Prevents Embrittlement, UV Absorbing

Synonyms: 2,2′,4,4′-Tetrahydroxy diphenyl ketone, 2,2′,4,4′-Tetrahydroxybenzophenone, 2,4,2′,4′-Tetrahydroxybenzophenone, Bis(2,4-dihydroxyphenyl)methanone, NSC 38556

Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses

Compatible Polymers & Resins
Advantages
  • Eversorb® 51 is particularly recommended for PET and polycarbonate.

Properties

Color (Properties)
Physical Form
Appearance
Yellow powder
Physical Properties
ValueUnitsTest Method / Conditions
Melting Pointmin. 195.0°C-
Typical Properties
ValueUnitsTest Method / Conditions
Molecular Weight246g/mol-
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Flash Pointmin. 150°C-
Ignition Temperaturemax. 400°C-
Insoluble inWater--
Specific Gravity1.22--
Vapor Pressure (at 20°C)1.0X10⁻⁵Pa-
Solubility Data
ValueUnitsTest Method / Conditions
Ethyl Acetate Solubility (at 25°C)10g/100g solvent-
Ethyl Alcohol Solubility (at 25°C)50g/100g solvent-
Methyl Ethyl Ketone Solubility (at 25°C)20g/100g solvent-
Toluene Solubility (at 25°C)min. 1.0g/100g solvent-
Water Solubility (at 25°C)min. 1.0g/100g solvent-

Regulatory & Compliance

Technical Details & Test Data

Techical Information
  • UV-Vis. Spectrum λmax.=352nm & 286nm (20ppm in THF)

Eversorb® 51 - Technical Information - 1

  • TGA scans 5% weight loss: 215 C (heating rate 20 C /min. in air)

Eversorb® 51 - Technical Information - 1