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Hi, I would agree with Elastomatt, it sounds like a moist problem. I think you could increse the amount of dessicant(calcium oxide) to at least 3-4 Phr without a problem. Also make sure the dessicant has been keept in a closed container prior to mixing, if it is exposed to moist the dessicant...

A quick test that I sometimes find useful, is to use a pair of scissors to cut a thin section of the profile in the direction of the extrusion. I then pull and hold for a little bit. If the section returns to its original length, that gives me an idea about the grade of vulcanization. I suppose...

Hello, Your method should work; I have done similar brands myself with good results. I used a brass template which I placed along with the rubber in a press and closed it for two minutes with a temperature of about 200°C (see attached image). I believe you have used a temperature that has been...

In my experience cure shrinkage is limited to about 1-3%. The neoprene heat shrink tubes are stated to have a shrink ratio of 2:1 or about 50% on the diameter. Also, this suggests that the tubes are delivered uncured and then applied and shrunk (cured) with a hot air gun or such... /Mathias

Well, I actually didn’t really trust wikipedia and so I posted the question on this forum (which was wise as it seems... :-)) Never the less, wholesalers are supplying "Neoprene Heat Shrinkable Tubing" (http://www.buyheatshrink.com/heatshrinktubing/neoprene-heat-shrink.htm). Are these made with...

Thank you for your reply, I got this info from wikipedia... " According to the exact material used, there are two ways that heat shrink may work. If the material contains many monomers, then when the tubing is heated the monomers polymerise. This increases the density of the material as the...

Hello everyone, For an application I´m currently working on a heat shrinkinig function would solve my problems, much like heat shrink tubes in electrical applications. I have seached the web and came across tubes made from both elastomers(type not specified)and Viton. My question is; does...