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1843-05-6 Usage


Octabenzone, also known as 2-Hydroxy-4-(octyloxy)benzophenone (HOBP) or UV Absorber 531, is a UV absorber/screener that protects polymers such as polyethylene, polypropylene, and polyvinylchloride against damage caused by ultraviolet (UV) light. It is a light yellow powder that is odorless and soluble in various solvents. Octabenzone is characterized by its light color, non-toxicity, good compatibility, small mobility, and ease of processing. It is stable under recommended storage conditions and has a wide range of industrial applications.


Used in Plastics and Rubber Industry:
Octabenzone is used as a UV stabilizer for polyethylene and polypropylene fibers to protect them against deterioration caused by UV light exposure. It helps to reduce color changes and maintain the physical properties of the materials.
Used in Paints and Coatings Industry:
Octabenzone is used as a light stabilizer in paints and coatings to enhance their light fastness and protect them from UV-induced degradation. It can be combined with antioxidants, phosphites, and other light stabilizers to provide comprehensive protection.
Used in Building/Construction Materials Industry:
Octabenzone is used in building and construction materials to protect them from UV-induced damage, ensuring their durability and longevity.
Used in Fabric, Textile, and Leather Products Industry:
Octabenzone is used in fabric, textile, and leather products to protect them from UV-induced fading and degradation, maintaining their color and strength.
Used in Furniture and Furnishings Industry:
Octabenzone is used in furniture and furnishings to protect them from UV-induced damage, ensuring their durability and maintaining their appearance.
Used in Air Care Products Industry:
Octabenzone is used in air care products to protect them from UV-induced degradation, ensuring their effectiveness and longevity.
Used in Organic Solar Cells (OSCs):
Octabenzone is used as a UV absorber for insulating plastics in organic solar cells, which can be incorporated with active layers to increase the stabilization of the cells. It may also be incorporated in parylene C films to enhance their light stability, potentially making them suitable for use as moisture transfer membranes in electronic boards and photovoltaics.
Used in Processing Aids Industry:
Octabenzone is used as a processing aid in various industries to improve the performance and stability of materials during processing.
Used in Adsorbents and Absorbents Industry:
Octabenzone is used in adsorbents and absorbents to protect them from UV-induced degradation, ensuring their effectiveness and longevity.


UV Absorber 531 is particularly suitable for thick films, typically > 100 μm and thick sections. The low vapor pressure of UV Absorber 531 prevents losses during processing. Low migration rates reduce the risk of blooming.

Analytic Laboratory Methods

Migration of photo stabilizers from plastics was studied in model elution expt where the plastics were placed at different temp 20 and 45 degree in different solvents, e.g. H2O, acetic acid,? sunflower oil, heptane, and the amt of photostabilizer eluted was determined by spectrophotometry and by gas chromatography. The elution of 2-hydroxy-4-n-octyloxybenzophenone depended on the type of plastic. Elution was low in polystyrene and high in polyolefins, polyethylene. Food contamination from these plastic additives is discussed.

Handling & Safety

In accordance with good industrial practice, handle with care and avoid unnecessary personal contact. Avoid continuous or repetitive breathing of dust. Use only with adequate ventilation. Protect skin. Avoid dust formation and ignition sources. For more detailed information please refer to the material safety data sheet.


1. https://pubchem.ncbi.nlm.nih.gov/compound/Octabenzone#section=U-S-Exports 2. https://en.wikipedia.org/wiki/Octabenzone


Preparation by reaction of n-octyl chloride with 2,4-di-hydroxybenzophenone, ? in the presence of a mixture of sodium carbonate, triethylamine and potassium iodide in refluxing butanol for 15 h (90%); ? in the presence of potassium carbonate in cyclohexanone at 145° for 5 h (66%); ? in the presence of potassium hydroxide and antimony triiodide in diethylene glycol at 150° for 1 h (93%); ? in the presence of sodium bicarbonate and potassium iodide in 1-methylpyrrolidone for 2 h at 150° (96%).

Flammability and Explosibility


Check Digit Verification of cas no

The CAS Registry Mumber 1843-05-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,4 and 3 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 1843-05:
76 % 10 = 6
So 1843-05-6 is a valid CAS Registry Number.

1843-05-6 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Alfa Aesar

  • (L11750)  2-Hydroxy-4-n-octyloxybenzophenone, 99%   

  • 1843-05-6

  • 25g

  • 95.0CNY

  • Detail
  • Alfa Aesar

  • (L11750)  2-Hydroxy-4-n-octyloxybenzophenone, 99%   

  • 1843-05-6

  • 100g

  • 219.0CNY

  • Detail
  • Aldrich

  • (413151)  2-Hydroxy-4-(octyloxy)benzophenone  98%

  • 1843-05-6

  • 413151-100G

  • 627.12CNY

  • Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 11, 2017

Revision Date: Aug 11, 2017


1.1 GHS Product identifier

Product name Octabenzone

1.2 Other means of identification

Product number -
Other names benzophenone-12,octabenzone

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Adsorbents and absorbents,Paint additives and coating additives not described by other categories,Processing aids, not otherwise listed
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:1843-05-6 SDS

1843-05-6Synthetic route





Cyasorb UV531

Cyasorb UV531

With sodium carbonate; potassium carbonate at 98 - 120℃; Temperature;95.3%
With sodium carbonate In N,N-dimethyl-formamide at 70℃; for 8h; Temperature; Reagent/catalyst; Solvent;95%

1843-05-6Relevant articles and documents

Novel process for preparing sun-screening agent 2-hydroxy-4-n-octyloxy benzophenone


Paragraph 0097-0104, (2021/02/06)

The invention discloses a novel process for preparing a sun-screening agent 2-hydroxy-4-n-octyloxy benzophenone. According to the process, 2,4-dihydroxy benzophenone is prepared, and 2,4-dihydroxy benzophenone and 1-chloro-n-octane are used as raw materials, wherein the prepared 2,4-dihydroxy benzophenone is simple in method, has no need of posttreatment and can be directly used as a reaction rawmaterial for subsequent reaction, and the energy consumption is reduced from the source; 1-chloro-n-octane is taken as an alkylation reagent, inorganic base is taken as a catalyst, solvents are addedfor reaction, and the yield of the obtained product 2-hydroxy-4-octyloxybenzophenone is high and can reach 90% or above. According to the method, the raw material cost is reduced, the problem of industrial wastewater at present is solved, in addition, the whole process is mild in condition, few in three wastes, high in yield and good in product quality, the use requirements of the cosmetic industry are met, the technological process is simple to operate and easy to realize, the intermediate reaction process is simple and easy to control, and industrial production can be realized.

Cosmetic compositions


, (2014/07/08)

Suggested is a cosmetic compositions comprising (a) a crosspolymer obtained from copolymerisation of at least two different polyols and at least one dicarboxylic acid and (b) at least one fragrance.

Substituted hexahydro-1,4-diazepin-5-ones and compositions stabilized therewith


, (2008/06/13)

The instant invention pertains to white, dyed, dipped, unscented and/or scented candle wax which is effectively stabilized against discoloration and fading by the incorporation therein of a substituted hexahydro-1,4-diazepin-5-ones in combination with a UV absorber and/or an antioxidant. Additionally, some novel substituted hexahydro-1,4-diazepin-5-one compounds are described.

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