Fuel cell comprises a cathode, and anode and an electrolyte. The cathode is made from a material of the formula: (Sr1-xCax)1-yAyMn1-zBzO3-d (where A = Ba, Pb, Na, K, Y or lanthanide; B = Mg, Al, Ga, In, Sn or group IVb, Vb or VIb element; x = 0.2-0.8; y = ...

A sandwich sheet (I) comprises: (A) a core layer of polypropylene particulate foam; (B) cover layers of fiber reinforced polypropylene as well as optionally; and (C) decorative layers. The core layer (A) contains 1-30 wt.% recycled particles from component...