I was browsing the outdoor sports section of my local Meijer store today and came across some Hexamine fuel tablets. They were labeled "UST Fuel Cubes". There were 8 tablets per package for $2.50. At 1-1/2" X 1-1/2" X 1/2", they aren't exactly cubes, but each tablet is supposed to weigh 23 grams and burn for 18 minutes (from UST's web site). They are almost twice the weight of Esbit tablets and a good three times the weight of Coghlans fuel tablets. The label says "Contains Hexamine" so they are either Hexamine or a Hexamine and Trioxane blend. I bought a couple of packs, but haven't weighed them or had occasion to light one, so I can't speak to the manufacturer's claims.
