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Technical Data Sheet
Eastman™ Hydroquinone, Photographic Grade

  • Agriculture intermediates
  • Dyes / pigments / paints
  • Herbicides - intermediate for other
  • Intermediates
  • Methyl methyl acrylate (mma)
  • Paints & coatings
  • Peek (polyether ether ketone)
  • Photographic chemicals
  • Photographic supplies
  • Polymer modification
  • Polymer processing
  • Resins
  • Rubber modification
  • Specialty chemicals

Product Description
Eastman™ Hydroquinone, Photographic Grade, is a white crystalline solid. HQ is used as a good general-purpose inhibitor, stabilizer, antioxidant, and intermediate. Hydroquinone is offered in both photographic and USP grades for use in many applications.

Typical Properties

PropertyTypical Value, Units
Molecular Weight110.11
Empirical FormulaC6H6O2
FormWhite crystals
Assay99.4 wt % min.
Bulk Densitya0.66 g/mL
Density, Solid Phase 
     @ 4°C1.34 g/mL
     (5% HQ in 0.1N HCl) @ 455 nm0.19 max.
     (5% HQ in 0.1N HCl) @ 520 nm0.12 max.
     (5% HQ in 0.1N HCl) @ 700 nm0.07 max.
Water0.6 wt % max.
Iron10 ppm
Boiling Point286 °C (547 °F)
Sublimation Temperature 
     @ 1 mm Hg132 °C
     @ 1 x 10-2 mm Hg85 °C
     @ 1 x 10-4 mm Hg48 °C
     @ 1 x 106 mm Hg20 °C
Yellowness Index35 max.
Flash Point 
     Cleveland Open Cup177 °C (350 °F)
Fire Point 
     Cleveland Open Cup191 °C (375 °F)
Autoignition Temperature499 °C (930 °F)


Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

1/24/2024 4:35:33 PM