Benetex OB-1

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Benetex OB-1 (1533-45-5) is a heat resistant and chemically stable fluorescent whitener that increases  whiteness and provides brighter looking colors.  It is used to offset the yellowness of a polymer and to yield a whiter appearance.  Optical brighteners create brilliance by a fluorescence process involving absorption of invisible UV light and emission of visible blue light.  Benetex OB-1 is especially useful in polyester and nylon fibers, as well as in high temperature engineering plastics.


Chemical Name:         2,2’-(1,2-ethenediyl)bis(4,1-phenylene)bisbenzoxazole

        CAS Number:             1533-45-5

Chemical Structure:

Benetex® OB-1 HP

Typical Properties    

Product Form:                 Solid

Melting Point:              >359°C

Molecular Weight:       414.4 g/mol


Benetex OB-1 HP is recommended to increase the whiteness of polyester and polyamide (nylon)
fibers as well as in high temperature engineering plastics, including polycarbonates, polyesters, and
polyamides (nylon). It is also suitable for use in styrenic and acrylic polymers.


  • Brilliant, neutral white cast that compensates for yellowing
  • Low volatility and excellent heat resistant make the product ideal for use in fibers and in
    engineering plastics processed at high temperatures
  • In combination with dyes, produces particularly bright shades
  • Good light fastness
  • FDA cleared for use in all polymers

Guidelines for Use

Recommended loading concentrations for Benetex OB-1 HP range between 50 and 1000 ppm
(0.005-0.1%). The product can be used alone or in a variety of blends and combinations with other
additives, including antioxidants, processing stabilizers, and light stabilizers. Higher load levels of
Benetex OB-1 HP are required if it is used in combination with a UV absorber. The exact
formulation to be used is dependent on the substrate, performance requirements, and other factors,
and should be determined by the user based on testing to simulate actual conditions of use. Please
contact Mayzo for specific recommendations.
Due to the high melting point of the product (359 degrees Celsius), care must be taken to ensure complete dispersion when Benetex OB-1 HP is used in polymers processed at lower temperatures such as styrenics and acrylics.


This product may be stored up to two years in a sealed container. Containers should be kept tightly
closed when not in use and stored in a cool, dry place.


Please consult the Safety Data Sheet (SDS) prior to handling or using this product.

FDA Regulations

Benetex OB-1 HP has been cleared for use in all polymers under 21 CFR §178.3297. Please
contact your Mayzo representative for complete details, including restrictions of use.

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