{"id":236,"date":"2014-04-18T10:58:00","date_gmt":"2014-04-18T07:58:00","guid":{"rendered":"http:\/\/blog.polyurethan.ru\/?p=236"},"modified":"2021-10-06T13:37:20","modified_gmt":"2021-10-06T10:37:20","slug":"frost-resistance","status":"publish","type":"post","link":"https:\/\/blog.polyurethan.ru\/en\/2014\/04\/18\/frost-resistance\/","title":{"rendered":"Polyurethane frost resistance"},"content":{"rendered":"\n

Introduction<\/strong><\/p>\n\n\n\n

Based on the requests of our customers, most of which live in cold regions of Russia, we analyzed the cases of failure of suspension parts. One of the main reasons for the destruction of spare parts is operation in severe frosts. As you know, already at -20 \u00b0 C, most rubbers begin to lose their elasticity. This has an extremely negative effect on various cuffs, gasket rings and other products whose task is to ensure tightness. In the car suspension, especially CV joints<\/strong><\/a> and hydraulic shock absorbers, are most affected by low temperatures.<\/p>\n\n\n\n

CV joint dust boot<\/strong><\/p>\n\n\n\n

The specificity of the CV joint device is such that it requires plentiful and constant lubrication, does not tolerate dirt. Tightness is ensured by rubber protective covers (CV joint dust boots). The CV boots of the hinges are in the form of a corrugation so that each time the anther is compressed, the grease smeared along the walls returns to the hinge. In case of leakage, any lubricant (most often, on a molybdenum or lithium base) is rapidly oxidized (or squeezed out through the boot), which leads to wear of the entire assembly.<\/p>\n\n\n\n

Visual illustration of the effect of low temperatures on the CV dust boot<\/strong><\/p>\n\n\n\n