Material :  Tantalum gasket
Purity    :  99.95%min
Condition: temper annealed
Specs   :   according to ASTM B708 - 98 R05200.
Chemical composition   :
                O                   0.0150  %max
                C                   0.0100   %max
                N                   0.0100   %max
                H                   0.0015  %max
                Fe                  0.0100%max
                Ni                   0.0100%max
                Si                   0.0050   %max
                Ti                   0.0100  %max
                Mo                 0.0200  %max
                W                  0.0500   %max
                Nb                 0.1000  %max
                Ta                 balance  (typically 99.92%)
Size available:  customize to your special request or tailor to your drawings.
Typical size :

43.7mm OD x 28.6mm ID x 3.5mm thick
51.6mm OD x 36.5mm ID x 3.5mm thick
92.9mm OD x 69.8mm ID x 3.5mm thick
127.8mm OD x 98.4mm ID x 3.5mm thick
153mm OD x  138 mm ID  x 4.1mm thick
158mm OD x 123.8mm ID x 3.5mm thick

We can tailor the sizes upon request.