Glass bottles carbonating better than PETs

[Halfacrem]

I posted this thread viewtopic.php?f=36&t=33791 a few weeks back, about my Nelson's Revenge not carbonating very well in the bottle.

Following advice, I bought the bottles back in the warmth for a further 16 days and now they are back in the garage. In total they have been in the bottle for 6 weeks.

I had bottled some of the beer in flip top glass bottles, the rest in Coopers OX bar PET bottles. On Sunday I cracked open a glass bottle and it was perfectly carbonated - nice head lasting all the way down the glass :thumb: Thinking all was well, I cracked open a PET bottle last night, and it was pretty much the same as the previous PET bottles I'd opened, quite lifeless :hmm:

I know that the amount of sugar (80grams) was enough to give decent carbonation (evidenced by the nicely carbonated glass bottle)
Would there be any reason why a glass bottle will carbonate better or quicker than a PET one? I'm discounting an issue with the screw caps on the PET bottles because I screwed them on plenty tight on bottling!!

 

[fermentall]

I use the crown cap pet bottles & so far have noticed no difference than with glass : ken.

 

[bottler]

I use the crown cap pet bottles & so far have noticed no difference than with glass : ken.

Same here :thumb:

 

[rpt]

I use both glass bottles and the Coopers PET bottles. Both seem to have a similar level of carbonation.

 

[Halfacrem]

Thanks guys,

It's a strange one. The PETS are definitely carbonating, but at a much slower rate than the glass bottles. I cracked open another PET bottle over the weekend and the carbonation had improved, but not to the extent that the glass bottles had. I'm not in a hurry to drink them, so I'll give them more time :thumb:

 

[Hobbins]

If you're using the crew top Coopers bottles for the first time in that they've got the anti tamper ring on them you really need to screw them down hard to get a good seal.

 

[Halfacrem]

They are definitely screwed down hard :thumb:

I broke the tamper seals when I filled the bottles and screwed them up as hard as I can. It's not that the beer is flat, it's progressing, but the overall carbonation level is quite a lot lower than the glass bottles of the same beer batch :wha:

 

[fbsf]

That's an odd one. I tend to get the same whether I'm using 500ml cola bottles or glass. Strange. :wha:

 

[oldbloke]

I just wonder if the priming sugar didn't get evenly distributed

 

[Halfacrem]

I just wonder if the priming sugar didn't get evenly distributed

That might have been the case oldbloke. I boiled up the sugar with a bit of water and put it in the FV before I syphoned the beer, but I guess it may not have distributed evenly. All the PET bottles have the same level of firmness to them, which suggests they all got a similar amount of sugar though!

Perhaps I'll just put it down to mystery The Beer is maturing nicely, which is the main thing :

 

[fermentall]

Ger :drink: it when it's ready & get another on :

 

[bigboots]

Very strange coincidence, but my Nelson's Revenge is also carbonating better in glass bottles than PETs. :wha: