in the polypropylene (see Figure 2) â¢ Pellet form â allows continuous compounding and bulk handling of the elastomer Figure 1: Low Temperature Ductility of Various Ethylene/Alpha-Olefin Elastomers(1)-65-60-55-50-45-40-35 Glass Transition Temperature (Â°C) Propylene Butene 0 5 10 15 20 25 Crystallinity (%) Octene Figure 2: Elastomer Dispersion in TPO(1)
Superior vena cava syndrome is most often caused by compression of the vein (the superior vena cava), that returns blood from the upper body back to the right atrium of the heart by tumor. Symptoms include swelling of the face and arms associated with shortness of breath.
Most superior vena cava syndrome cases are attributed to cancer, with the most common causes being lung cancer and non-Hodgkin lymphoma. A rare cause of superior vena cava syndrome is an infection of the mediastinum (in the chest), which causes thickening and hardness of the mediastinal tissues.