Gasket for ICF flange

Please indicate following two letters describing gasket material;

Aluminium: AL
Gold plating: AU
Silver: AG

ICF Gasket

Part Number	A	B
ICF34-G	21.3	16.3
ICF70-G	48.2	39.0
ICF114-G	82.4	64.0
ICF152-G	120.5	102.0
ICF203-G	171.3	153.0
ICF253-G	222.1	204.0
ICF305-G	273.3	256.0
ICF356-G	313.0	295.0
ICF406-G	369.0	351.0