Abstract: The present invention provides an outlet cap adapted to removably attached to the gas outlet of a gas discharge passageway in an on-off valve provided on a toxic gas containing container, the outlet cap comprising a bottom wall, a peripheral wall extending from the bottom wall and a gasket located on an inner surface of the bottom wall for sealing the gas outlet, the gasket including a gas absorbing means which is made of a material which does not chemically react with the toxic gas contained in the toxic gas container to degrade the sealing property of the gasket, the toxic-gas absorbing means being exposed to the gas discharge passageway when the outlet cap is attached to the gas outlet.

Abstract: The present invention provides an outlet cap adapted to removably attached to the gas outlet of a gas discharge passageway in an on-off valve provided on a toxic gas containing container, the outlet cap comprising a bottom wall, a peripheral wall extending from the bottom wall and a gasket located on an inner surface of the bottom wall for sealing the gas outlet, the gasket including a gas absorbing means which is made of a material which does not chemically react with the toxic gas contained in the toxic gas container to degrade the sealing property of the gasket, the toxic-gas absorbing means being exposed to the gas discharge passageway when the outlet cap is attached to the gas outlet.

Abstract: Activated carbon having a specific surface area of 700 to 1,500 m2/g, a pore volume of pores having a pore diameter of 10 nm or less of 0.20 to 0.8 cc/g, a proportion of a pore volume of pores having a pore diameter of 0.6 to 0.8 nm to a pore volume of pores having a pore diameter of 10 nm or less of 75% by volume or more, a grain bulk density of 0.4 to 1.1 g/cc, a packing density of 0.30 to 0.70 g/cc, an ash content of 1.0% or less, and a tensile strength of activated carbon grains of 30 kg/cm2 or more.