« on: July 01, 2013, 06:40:02 PM »
There really are only three causes of exploding bottles.
1- The beer was not finished fermenting, so there is excess sugar to be turned into CO2. Just make sure the gravity is stable and near the expected FG and you shouldn't have to worry about this at all.
2- The beer is infected with a wild yeast or bacteria. If you're sanitation is good, you shouldn't worry much about this either.
3- The bottle was physically damaged. You'll probably never see a microfracture that could cause the glass to break. So just use decent bottles and handle them gently. If one gets dinged, don't try to fill it. Honestly, this is rare.
There really is no safe point with any of the above since pressure can build up slowly over months with the first two causes. But if your brewing practices are good, you shouldn't worry too much.
5oz of priming sugar is a standard amount sold by shops for 5 gallons of beer. Some people like to fine tune the carbonation with more or less, but you won't go wrong with it. It certainly won't cause exploding bottles.
Boiled in a cup of water is right. Make sure to stir it into your beer gently, but thoroughly. Poorly mixed sugar will give you a mix of undercarbonated and overcarbonated bottles.