ECCOSTOCK^® SH is a rigid, closed cell, polyurethane foam which remains rigid at high temperatures. ECCOSTOCK^® SH may be used at a maximum service temperature of 275°F (135°C) and at 325°F (163°C) for short periods.  It is primarily used as a high temperature structural member or thermal barrier in electrical/electronic applications. 

Unlike most polyurethanes, ECCOSTOCK^® SH has extremely low dielectric loss and The ratio of the capacitance (ability to store electrical energy) of a condenser filled with the material in question to that of the same condenser filled with vacuum.dielectric constant.  The material is easily machinable and does not support fungal growth per MIL-STD-810E. 

ECCOSTOCK^® SH is also available as a two-part, foam-in-place liquid system called ECCOSTOCK^® FPH.  When cured, it has identical properties to ECCOSTOCK^® SH of the same bulk density.