Special Blue butane it is cold filtered and run through zeolite molecular sieves to filter out any impurities (impurities are a residue/contaminant – water, air, metals, dirt, other gas products that are removed during the refinement process). Special Blue 5x is run through this process 5 times. It meets both ISO and TUV regulations and is sold with a lifetime warranty. Butane refill for our Special Blue Butane Torches.
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