Abstract: A concentric insulation sleeve is disclosed having multi-layered structure. The outer layer exhibits low smoke and fume and non-halogen properties important for use of fiber optic cable assemblies in confined space susceptible to combustion conditions. The inner layer exhibits anti-static properties, and optionally slippery properties, to make the assembly of fiber strands in the insulation less charged with static electricity. The cable can become associated with other cables and serve as mini-ducts and then be surrounded by another insulation sleeve of the same construction to form a cable duct.

Abstract: A concentric insulation sleeve is disclosed having multi-layered structure. The outer layer exhibits low smoke and fume and non-halogen properties important for use of fiber optic cable assemblies in confined space susceptible to combustion conditions. The inner layer exhibits anti-static properties, and optionally slippery properties, to make the assembly of fiber strands in the insulation less charged with static electricity. The cable can become associated with other cables and serve as mini-ducts and then be surrounded by another insulation sleeve of the same construction to form a cable duct.

Abstract: The invention relates to a foam comprising at least 70% by weight of carbon and having a mean cell size above 20 ?m, a porosity based on this cell size of from 35% to 99.5% and an open cell content above 90%, an internal surface above 50 m2/g, having cell struts whose cross section is a triangle having concave sides and having pores in the cell framework material having dimensions of from 0.2 nm to 50 nm and a volume of from 0.01 cm3/g to 0.8 cm3/g, and also to its use. It further relates to a process for producing a foam comprising at least 70% by weight of carbon by pyrolysis of polymer foams which comprise at least 30% by mass of a polymer material having a nitrogen content of more than 6% by mass and having a porosity of from 35 to 99.5% and an open cell content above 1%, have inorganics incorporated into the polymer foam and/or applied to the surface and/or are treated during and/or after the pyrolysis with water vapor and/or carbon dioxide and/or oxygen at above 400° C.