Glass vs PET

[bquiggerz]

Hello everyone,

Today was the first leg of the great bottle experiment. Me and a friend bottled a hoppy AG bitter using my usual PET but 6 glass along side. Today was the one month, well 5 weeks test day.

Glass was opened first, this was the first beer of mine to hold a head. The aroma was amazing, floral, sweet with a hint of fruitiness. The taste was great, a sharp bitterness followed by a small wave of sweet malty flavour and finally a hoppy finish with citrus after notes.

The PET bottle intrigues me as the head was zero, the overall flavour was the same but aroma seemed slightly duller. This could have been from the last beer numbing my senses but who knows.

The recipe has been lost and is a real shame as its an amazing brew. My advice to everyone is to keep good notes, even when kit brewing. You may do something different and it turn out great.

Thanks for reading, I'll be back in two months with the next.

Ben.

[VANDEEN]

was planning to bottle 10L of Brewferm Abdji into pet. Not so sure now

[bquiggerz]

I've been using PET up to now and don't think I'll be switching any time soon. They're just easier apart from the swingtops I own

[Sadfield]

Bquiggers, were both the glass and PET bottles, brown bottles?

I have used both Glass and PET with no ill effects in the short term, however I find PET harder to clean than the flat bottoms of glass, if I've kept a beer that has used a particularly flocculent yeast, for a length of time. I also label my bottles, and glass wins every time when it comes to removing labels. After 3 or 4 uses PET become a bit tired looking and don't inspire confidence when visually inspecting for cleanliness. Horses for courses, but I'm moving to glass.

[bquiggerz]

The glass are clear but both are kept in darkness. Neither see sun at all in the room they're in until drinking time.

[Mr. Dripping]

I've been using the Coopers PET bottles now for a while and think they are great.....no issues with beer quality.
Look for them on special offer from Te$co and buy a few cases at a time.....I just consider them to be one use disposables at that sort of price. No cleaning hassles, just rinse with peracetic and use.

[brewnaboinne]

I also use a mixture of PET bottles and glass swing-top bottles. There is a difference as you have seen. Long term the ordinary PET bottles allow the beer to get oxidised. I imagine the coopers oxi bar type have a coating to reduce permeability. There was a discussion about this on here and the explanation is to do with partial pressure. I don't claim to know much about physics and if someone does have a good grounding in physics they might explain better. As I understand it even though the pressure of carbon dioxide may be bursting your bottles the partial pressure of oxygen inside is less than the general atmosphere so the oxygen still wants to get inside. Why that should be so I don't know. Anyone know?

[bquiggerz]

I think it has something to do with diffusion. If you know how a reverse osmosis filter works you get the idea. Basically everything in the universe is wanting to be at an equal concentration. Hence why if you put colouring in water without mixing it will still spread out throughout the liquid.

The term I THINK is the main point as I really am not sure, going back to school physics there. Someone will come along and put me straight soon enough if it isn't right.