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A5758 Sigma

Antifoam Y-30 Emulsion

aqueous-silicone emulsion



Frequently Asked Questions

Frequently Asked Questions are available for this Product.


Do you have application information on this product that you would like to share?

Antifoam Y-30 Emulsion is used for the following applications:
• Chemostat cultivation.
• Cultivation conditions, such as Fed-batch fermentation.
• Bacterial strains and growth conditions (used in all aerosol experiments).

Other Notes

A 30% aqueous emulsion of Antifoam A concentrate.


More easily dispersed in aqueous systems than Antifoam A concentrate.


100, 250, 500 mL in poly bottle

General description

Antifoam is also known as defoamer. It is a chemical additive that reduces and hinders the formation of foam in industrial process liquids. It is used to prevent formation of foam or is added to break foam that is already formed.

Price and Availability

Safety & Documentation

Safety Information

GHS08  GHS08
Signal word 
Hazard statements 
Precautionary statements 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
>392 °F
Flash Point(C) 
>200 °C

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
How do I get lot-specific information or a Certificate of Analysis?
A Certificate of Analysis is available by lot number and can be obtained through our Advanced Search Option: http://www.sigmaaldrich.com/catalog/AdvancedSearchPage.do
How do I find price and availability?
There are several ways to find pricing and availability for our products.  Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers. 
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS. To access the shipping information for this material, use the link on the product detail page for the product, or search here. 
My question is not addressed here, how can I contact Technical Service for assistance?
Use the option to the right to "Ask a Question" by email of a Technical Service Scientist.
Has there been a name change for Antifoam Y-30 Emulsion, Product A5758?
Yes. The product was formerly listed under the name "Antifoam A Emulsion".  Although there has been a name change, there is no change in the composition of the antifoam. It is the same product.
What is Antifoam Y-30 emulsion?
Antifoam Y-30 emulsion,a Dow-Corning product, is a 30% active silicone emulsion, whose usage is intended for controlling foam in aqueous systems. The composition of the antifoam is considered proprietary by the manufacturer.  However, the emulsifier type is described as nonionic.
How can Product No. A5758, Antifoam Y-30 Emulsion be used?
This antifoam can be diluted with water. It is effective at low concentrations (1-100 ppm is the usual range to use). Trials can start at 50 ppm (active silicone), and amounts may be reduced to where the level of foam control is desired. The product should be agitated before use. Additional description on usage can be found in the product information sheet at our website. Click on the following link to view it. http://www.sigmaaldrich.com/etc/medialib/docs/Sigma/Product_Information_Sheet/a5758pis.Par.0001.File.tmp/a5758pis.pdf
Can Antifoam Y-30 Emulsion, Product A5758, be autoclaved?
Dow Corning® does not recommend that the emulsion be autoclaved since autoclaving can adversely affect the product.  
What is the difference between product A5758, Antifoam Y-30 emulsion and product A6457?
Product A6457, a molecular biology reagent, has been function-tested by Sigma for use in bacterial fermentation. Product A5758 has not been tested in this application by Sigma.
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Protocols & Articles



A6426 Antifoam 204 A8311 Antifoam 204 (autoclaved) A5633 Antifoam A Concentrate A6582 Antifoam A Concentrate Molecular biology grade A5757 Antifoam B Emulsion A8011 Antifoam C Emulsion A5758 Antifoam...
Keywords: Antimicrobials, Culture media, Fermentation, Filtration, Molecular biology, Nucleic acid denaturation, Sample preparations, Separation

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