Originally Posted by ajdelange
Plastic like could quite possibly be chlorphenolics. Does your water authority use chloramine? See the Sticky on Campden tablets.
Burnt rubber, OTOH, suggest yeast autolysis. Was the beer transferred to the bottles clear? Is it carbonated by live yeast? Have the bottles been kept cold?
Yes they use chloramine (2.7ppm, I have no idea if it's a lot or negligeable).
The beer transferred clear. I suspected the yeast on the first batch so I tried to be really careful about it on the second batch. I used Irish moss. I made a good starter (1.5q). I did a good week in primary and 3 weeks in secondary finishing with the last week around 45F. The beer was fairly clear. After bottling I kept the bottles at room temperature for 4 weeks they have now been in the fridge for a couple more.
Carbonation was good after only a week in the bottle. The yeast settled well in the bottom of the bottle and the beer is clear. I am actually pretty happy with the appearance (the colour is really good too). I didn't notice the taste after a week in bottle (it was slighty yeasty though).
When I said burned rubber, I might have been a little extrem.
It's a taste that I can detect in the middle of the roof of the mouth. (if it can help...)