Secondary fermenting in closed glass bottles

[ianmatth]

I'm brewing a highly hopped-up lager with Pilsner yeast. I plan to keep it in the primary fermenter for 7 days at 48-50 degrees. I wanted to do an experiment with dry hopping with different hops, so I wanted to use half gallon glass bottles for secondary fermentation. Would I be fine just using the cap so it is airtight, or would I need some way to blow it off?

 

[beergolf]

You will need some way to relieve pressure unless you want a big messy bang.

You could either fit the bottles with an airlock or even just cover them with some sterilized foil.

 

[AnOldUR]

Would I be fine just using the cap so it is airtight, or would I need some way to blow it off?

If you've reached your final gravity and checked it over a few days for stability, it should be safe. Even so, to be safe I'd use sanitized foil and a rubber band.

 

[ianmatth]

Thanks, I'll use sanitized foil and a rubber band.