> "Pure crude rubber is a > hard, transparent solid; from 0° to 10° C (32° to 50° F) it is brittle and > opaque, and above 20° C (68° F) it becomes soft, resilient, and translucent. > When rubber is mechanically kneaded, or is heated above 50° C (122° F), it > becomes plastic and sticky; above 200° C (392° F) it decomposes. Another possibility would be heat. Depending on what else the rubber is formulated with (to modify the physical properties of pure rubber), maybe the rubber starts melting/cracking when the boat, sitting in the sun, heats up and the insides of the hatches get much hotter than the outsides..... Erik Sprenne a Great Lakes paddler ps - has anyone tried filling in the cracks with Aquaseal? *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Sun Jul 30 2000 - 22:17:34 PDT
This archive was generated by hypermail 2.4.0 : Thu Aug 21 2025 - 16:30:29 PDT