The Brew Bag Blog — polyester fabric

Interested to find out if the mill setting makes a difference? We've done our own experiments as well and coupled with many BIAB brewers comments from around the web, come to the same conclusion - a finer crush aids in faster more complete conversion, higher efficiency numbers, and in our humble limited opinion a better tasting beer - but we're a bit biased on the taste side of things. The folks at Brulosophy conducted a test that you can find here.

    Frequently we are asked if the material we use to make the bags is food safe. Every component of the the bags is made from 100% polyester - thread, strap, material. Above you'll see the results of the test on the entire bag - all materials passed. For competitive reasons we have blocked out the name of our manufacturer. PET, which stands for polyethylene terephthalate, is a form of polyester (just like the clothing fabric). It is extruded or molded into plastic bottles and containers for packaging foods and beverages, personal care products, and many other consumer products.  ...

I used to be the guy that chased exact temp mashing. As a home brewer does the final product benefit to any noticeable degree from being mashed at any constant temperature for the entirety of the mash? Does kettle mashing have any drawbacks compared to cooler mashing? Based on conversion facts what do we need to do to make good beer? It is a proven fact that when mashing grain, 90% of the conversion from starch to sugar occurs within the first forty-five minutes. For the non-scientific heat transfer explanation it is also proven that the mash insulates itself and...

I've never been asked that question, but in response to "is the bag strong?" I say, "the material can not be ripped by any man I know, (meaning the phone book rippers may be able to rip the bag, but I don't know any of them) and because of the strength and composition of the fibers, it will not rip - even after being cut. You can see a stress test of the fabric holding a forty pound container of water here.  In preparation for retail sales of The Brew Bag, we did all manner of testing on the material and the strapping. We pulled...