• USA Home
  • A5758 - Antifoam Y-30 Emulsion

A5758 Sigma-Aldrich

Antifoam Y-30 Emulsion

aqueous-silicone emulsion



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.


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).


100, 250, 500 mL in poly bottle

Other Notes

A 30% aqueous emulsion of Antifoam A concentrate.


More easily dispersed in aqueous systems than Antifoam A concentrate.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

Please Enter a Lot Number

Certificate of Origin (COO)

Please Enter a Lot Number

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.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
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.
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.
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.
My question is not addressed here, how can I contact Technical Service for assistance?
Ask a Scientist here.
My question is not addressed here, how can I contact Technical Service for assistance?
Ask a Scientist here.
Show more questions
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

Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?