So, im bringing up this old thread because I bought a packet from my home brew store labeled DowC F-10. But it had no other information on the package, and amongst several home brew forums there is a lot of confusion and guessing about its actual composition is. I wanted to know what it really was, and if anyone could help me I would much appreciate it.
I tried a search on their site, which turns up no product from Dow called F-10. While FG-10 and XIAMETER® AFE-0010 Antifoam Emulsion FG look similar, they are both emulsions. "Emulsion in powder form" makes no sense really.
So the only food grade powder antifoam they sell is Xiameter ACP-1920 Powder antifoam. This has the same active ingredient, dimethyl polysiloxane as the above mentioned emulsions.
I believe that someone somewhere called this FG-10 in powder form because it is chemically equivalent. So, if anyone is interested the real product they are buying it is probably Xiameter ACP-1920 from Dow.
The EPA has dimethyl polysiloxane listed under polymers exempt from requirements of tolerance in section 180.960, but the much stricter European Union has max concentration set at 10mg/L of dimethyl polysiloxane in drinks such as fruit juices and ciders. Since, according to their MSDS, dimethyl polysiloxane is 20% by weight powder, the max is 50mg/L powder.
There is no recommendation to filter from brew prior to ingestion.
The recommended amount on the package, 5 grams per 23-25L, equals 200mg/L. This is 4 times higher than the limit set by the European Union. Additionally the max level that can be added to a food per the FDA is 0.005 weight percent, or 50mg/L.
So to be safe, use 50mg/L. Which is also what Dow themselves actually recommends in the data sheet.
I assume by 23-25L they intend this to be placed in a 6 gallon batch. For all those American system lovers, that means 0.17 oz/ 6 gallons which equals 0.283. That divided by 4 will achieve the desired concentration which is 0.007 oz / gallon. Or obviously 1/4 package / 6 gallon batch.
Anyway, its a lot of hoo haa, but I like to know exactly what goes into by batches.