Product number: 7520

HC Agar Base is used with Tween 80 (Polysorbate 80) for the enumeration of molds in cosmetics in a laboratory setting. HC Agar Base is not intended for use in the diagnosis of disease or other conditions in humans.

Methods for isolating molds from cosmetic products require incubation for 5 – 7 days using traditional agar media. In 1986, Mead and O'Neill described a new medium, HC Agar, for enumerating molds in cosmetic products. The formulation of HC Agar decreased incubation time to 3 days at 27.5 ± 0.5°C for molds. HC Agar Base, based on the HC Agar formula of Mead and O'Neill, is supplemented with Tween 80 (Polysorbate 80) to prepare HC Agar.


Formula Liter
Enzymatic Digest of Casein 2.5 g
Enzymatic Digest of Animal Tissue 2.5 g
Yeast Extract 5 g
Dextrose 20 g
Disodium Phosphate 3.5 g
Monopotassium Phosphate 3.4 g
Ammonium Chloride 1.4 g
Sodium Carbonate 1 g
Magnesium Sulfate 0.06 g
Chloramphenicol 0.1 g
Agar 15 g

Final pH: 7.0 ± 0.2 at 25°C
Formula may be adjusted and/or supplemented as required to meet performance specifications.

Supplement / Liter

Tween 80, 20 mL


  1. Suspend 54.5 g of the medium in one liter of purified water.
  2. Heat with frequent agitation and boil for one minute to completely dissolve the medium.
  3. Add 20 mL of Tween 80 (Polysorbate 80) and mix.
  4. Autoclave at 121°C for 15 minutes.

Order Details

Product # Product Description
7520A HC Agar Base, 500 g
7520T HC Agar Base, 5 kg
7520C HC Agar Base, 10 kg
7992 Tween 80, 100 mL

Reference Material

NCM0155 - HC Agar Base, Safety Data Sheet [Danish] [Dutch] [English] [EU English] [Finnish] [French] [German] [Hungarian] [Italian] [Spanish, Mexico] [Swedish]
7520 - HC Agar Base, Product Information Sheet [English] [Portuguese]

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