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Innertube Porosity?
In article ,
Steve Sr. writes: I was wondering if anyone has any information on the porosity of various kinds / brands of innertubes. By porosity I mean the very slow leakdown rate that occurs with sound tubes over days and weeks. You know... The reason you are always topping up your tires to prevent pinch flats. My current interest is any differences between the regular and "lightweight" road tubes of the same size. I am also wondering if "brand" makes any difference as well. Y'know, I've had tubes of the same brand with different seepage rates. So IMO, the particular brand may not be a useful quantifier. There may be a variation from batch to batch with tubes from the same manufacturer (or factory.) There may even be a variation within batches. I believe getting an especially air-retaining or an especially air-losing tube boils down to the luck of the draw. In general, tubes made from natural latex are lighter than butyl tubes, and are somewhat more porous[*]. Perhaps the weather conditions at the rubber plantations might cause some variation in the quality of batches of latex tubes? I dunno -- maybe how closely latex or butyl tubes are stored to the ship's generators (or other cargo whose out-gassings might react with "rubber") en route from China might affect their quality too. cheers, Tom [*] http://www.sheldonbrown.com/tires.html -- -- Nothing is safe from me. Above address is just a spam midden. I'm really at: tkeats [curlicue] vcn [point] bc [point] ca |
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