To use, rinse with water and steam sterilize in a vegetable cooker for 20 minutes, and add to fermenter. These are toasted for a crisper oak character. Unlike cubes which take a few weeks to impart flavor, oak chips impart their flavor relatively rapidly in beer. Use 1 to 2 oz. per 5 gallons, leaving the chips in contact with the beer for at least 8 days. Produced from American oak which has a slightly more aggressive flavor than French oak chips .