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Nov
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answered What is energy output in Strava application?
Nov
1
comment Is rubber cement in stationery stores the same as in tire patch kits?
If actual vulcanization had occurred, you would not be able to peel a patch off a tube.
Nov
1
comment Is rubber cement in stationery stores the same as in tire patch kits?
Not exactly. There often is real latex in rubber cement, and the solvent keeps it in suspension. The solvent volatilizes away leaving the adhesive and the rubber behind. You can use the same rubber cement whether your tube is butyl or latex; different formulations of rubber cement will include different amounts of rubber and different adhesives but no chemical vulcanization occurs.
Oct
31
comment Is rubber cement in stationery stores the same as in tire patch kits?
See my comment above to the other answer about vulcanization. "Rubber cement" is an adhesive that creates an airtight bond, so it's the cement that holds air in the (butyl) tube, not the patch. The patch is there to hold the cement in place around the hole and to protect the cement from abrasion. The molds used in manufacturing are sprayed with a "mold release" (think: Pam cooking spray) so you can peel the tube out of the mold. That's what you're trying to remove when you abrade the tube with sandpaper before applying glue and patch.
Oct
31
comment Is rubber cement in stationery stores the same as in tire patch kits?
Vulcanization does occur in natural rubber when exposed to sulfur and results in a cross-linked polymer but 1) most inner tubes are made of butyl, which is a synthetic rubber made from petroleum (which is why ExxonMobil is one of the major producers of butyl rubber) and isn't cured with sulfur and 2) vulcanization of natural rubber occurs under both pressure and heat. A typical vulcanization process using natural rubber and sulfur (with accelerants) is done at around 170 deg C. (~350 deg F).
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answered What is the difference between Time-Trial and Triathlon bikes?
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