I can tell you the product is silicone which we all use in the tubing (FOOD GRADE) including us. I cannot tell you the specific product as we have worked hard to modify this pump for this purpose and continue to do so like any other decent company. The newest coating is going to be more apparent in attempt to end the doubt. I am certain the certification will meet all expectations.
Please be assured these are not the same pumps others refer to from ebay, they are the same basic motor and ryton head but that's it, they were designed for another purpose all together.
Finally one day in the future, (please do not email when) we are working on an all stainless steel head so once again we can totally put this to bed. There are many brewing days ahead so don't wait.
PS. I have loved mine and continue to happily use them but those who wish to pay more for other brands because they feel it is a better choice for themselves, I completely support you in that decision and wish you happy brewing with whatever equipment gets you to the finish line.
GBE