Puretane’s premium butane is Made in the USA, and also known as N-Butane. It is triple refined and then filtered 9 times for maximum purity - 99.999%. Packaged in food grade aluminium which has a plastic BPA-free lining. This protects the gas from contamination, corrosion and toxic manufacturing lubricants usually found in conventional steel cans. Puretane’s aluminum cans are also recyclable, simply puncture the empty can and toss it in your recycling bin.