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Old 08-22-2009, 03:19 AM   #1
blowmax10
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Default Anyone got more knowledge of HDPE?

I work in PET blow molding but I get these 15 gallon HDPE vessels at work for free



I want to turn them into a cheap kind of conical but I'm uncertain about how oxygen proof they are. A friend at work told me that sometimes when they make these they include an additive to the plastic that makes it oxygen proof.

these were originally used for cranberry concentrate - anymore info on this from anyone?

Also I was thinking that even if they are not oxygen proof I could buy bags to use as liners on the outside of the vessel

The plan is to build a stand to put the vessels on and them mount a bulkhead fitting to the bottom to facilitate racking out of them in place

any input on this would be helpful

Thanks

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Old 08-22-2009, 03:30 AM   #2
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Quote:
Originally Posted by blowmax10 View Post
I work in PET blow molding but I get these 15 gallon HDPE vessels at work for free



I want to turn them into a cheap kind of conical but I'm uncertain about how oxygen proof they are. A friend at work told me that sometimes when they make these they include an additive to the plastic that makes it oxygen proof.

these were originally used for cranberry concentrate - anymore info on this from anyone?

Also I was thinking that even if they are not oxygen proof I could buy bags to use as liners on the outside of the vessel

The plan is to build a stand to put the vessels on and them mount a bulkhead fitting to the bottom to facilitate racking out of them in place

any input on this would be helpful

Thanks
I don't know much about HDPE but wouldn't the cranberry concentrate go bad over time if oxygen penetration were a problem? Just a thought.
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Old 08-22-2009, 03:46 AM   #3
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I don't know much about HDPE but wouldn't the cranberry concentrate go bad over time if oxygen penetration were a problem? Just a thought.
Yeah that's totally my thought - this stuff is like a year old when they use it

any way to do a test?
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Old 08-22-2009, 03:53 AM   #4
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I use a 6 gallon version of that for a no-chill container. The Pol suggested it on one his no-chill threads. US plastics sells them and this is what they say about the container

Winpak® Tight Head Pail is a self-supporting plastic container constructed of high molecular weight, high density polyethylene, and is designed for the secure, dependable shipment and storage of liquid products. Winpak® is cylindrical in shape with spout placement in line with the sidewall for maximum removal of product during dispensing. The unit is also equipped with a swing handle on the top face. Meets UN Packaging Type 1H1 and applicable FDA regulations. Has the standard 70mm liquid tight cap with 3/4" NPT center. Ideal for use with sanitary chemicals, flavorings/concentrates, edible oils, pharmaceutical preps, ag-chem chemicals, NEC photochemical x-ray & electronic diagnostic substances, misc. food & kindred products, powders. Not for fuels or oils. Neck size is 70mm.

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Old 08-22-2009, 04:19 AM   #5
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I have been looking at those for some time now..I want 1 to use as a fermenter. splitting a 10 gal batch all the time sux.

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Old 08-22-2009, 11:59 AM   #6
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HDPE has been used for fermentors for a long time... Id say go for it. I use them.

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Old 08-22-2009, 05:31 PM   #7
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The plastic buckets that many people use as fermentors are HDPE.

There is no additive that makes it "oxygen proof." HDPE is not completely impervious to O2, but the amount that leaches through is minuscule. It might be an issue if you left your beer in there for a year but for normal fermentation periods it won't be a problem.

That vessel will make an excellent fermentor. No bag or liner is needed.

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Old 08-23-2009, 03:24 AM   #8
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The plastic buckets that many people use as fermentors are HDPE.

There is no additive that makes it "oxygen proof." HDPE is not completely impervious to O2, but the amount that leaches through is minuscule. It might be an issue if you left your beer in there for a year but for normal fermentation periods it won't be a problem.

That vessel will make an excellent fermentor. No bag or liner is needed.
sweet thanks - I'm going to give it a go

I got some free plywood from work and I'm going to build a stand / enclosure for two of them
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Old 08-23-2009, 04:08 AM   #9
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How exactly do you clean the inside of the vessel after fermentation? I know that carboys have small openings, but they are see through so you can see how well you are cleaning it with a carboy brush. I don't know if I could be totally confident that you could get these 100% clean. Just a thought...I could be wrong.

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Old 08-23-2009, 04:20 AM   #10
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I get those from work all the time, I'm just hesitant to use one cause we get herbicides/surfectants/additives in them.

There are a few that only have crop oil, surfectant and color in them, could I clean the crap out of it and ferment in it?

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