... in 1999, this type of absorber has been successfully used in over 100 anechoic chambers for radar, satellite, wireless communication and ... performance test method, the oxygen index method >>, with oxygen index over 60% , it can meet therequirement of GB8624-1997 << Flammability ... . It is absolute safety materials, and it can be used in microwave anechoic chambers,, without any fire worries. Adopting ...