Thigtness Compound Climatic Test - Q$_{C}$

This method determinate the suitabilty of materials components, finised products and others to stressful conditions like: cold, heat, UV and IR radiations {\ldots} others. Generally, the thigtness is testing in lab environmental conditions. But some materials, components or finised products are used transported or/and deposited in special climatic conditions. So when we test thighness we must mimic the environmental factors of aging. The samples are same elastomers of general use (used for gaskets). The rubber was studied using IR measurements. We studied the structural changes which appear due to the climatic factors on samples of N50 rubber. The elastomer was cooled and irradiated with UV radiation. Due to cooling a new spectral band at 1443 cm $^{-1}$ appears, and also the intensity of spectral band from 1432 cm $^{-1}$ decreases. The most important structural changes, due to the degradation action of the ultraviolet radiations, appear after 10 hours of the action of the aging factor. The rubber was also studied with photoacoustic technique. An important decrease of thermal diffusity with the number of climatic cycles (aging factor - cold) and the UV irradiations dose was observed for N50 type samples. We assume that a variety of structural changes have been produced. This kind of elastomer is not a resistent one to stressful conditions. The results proved that thigtness compound method Q$_{C}$, works, is a very imortant one and must be applied.