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LDPE is not meant to be subjected to temps over 80c, and definitely not over 90.In order to be able to resist filling with hot liquid we need to use a triple layer barrier. so we have two layers of polyethylene with a layer of nylon in between. The polyethylene gives the plastic some protection from abrasion and puncture resistance and also improves the chemical resistance. The nylon is the barrier that is primarily to reduce gas transmission (oxygen in particular). Polyethylene is quite poor when it comes to oxygen transmission but nylon is excellent. So the multi layer film takes advantages of the properties of each layer.
There seems to be a lot of negative consumer sentiment at the moment especially with the amount of publicity that Trump is getting in America. With that said many of the Australian made bladders are made from Chinese film so even if we are to purchase the bags locally we would be in the same position. Its not so much an issue as to which country the bags are made but making sure they are made to the right food grade specifications.
I am not that into cask ales but I would be keen to get some feedback from you guys if any of you wanted to give cask ales a go in a bladder. I know commercially it's been done quite a lot already but I have not heard of home brewers doing this before.
What sort of testing or assurances / lab reports do you have that prove your tripple layer bags are safe for filling with boiling hot liquid before carrying them around?
Sure they may he food grade, but after my experience with your "food grade silicone hose" that stank so badly of curing agent I returned it, I'm suspect on the quality of the goods when the business model is "buy it as cheap as possible"
I'm also concerned that someone si.ply had an idea at KL that you could just fill these up with hot liquid cause you'd done it a few times at your factory and it looked fine.
Your fermzillas exploded on some occasions, and now your selling a product that you are telling people is ok to fill with 20L of boiling hot liquid.
Not sure why you would insinuate Trump has anything to do with sentiment against Chinese products, there are plenty of good things that come out of there but the reality is if you buy cheap you get cheap. And you guys buy as cheap as possible.
So the concern is valid. Do you have some scientific data, or testing (Australian, not something the manufacturer paid for) to show your LDPE bags somehow defy the laws of physics and chemical engineering to withstand temps over 80C, other than just "making it 3 ply"