| 摘要 |
<p>A porous sintered metal chromatographic column terminator element (38) comprises a relatively low density central disc portion (48), an integral relatively high density rim portion (44) peripherally circumscribing the central portion (48) and an interface zone (50) that integrally joins the rim and central portions (48,44). The relatively flat faces (52, 54 and 56, 58 respectively) of the rim and central portions (48,44) are essentially coplanar but are separated and delineated by a channel (60,62) at the surface of the interface zone (50) intermediate said coplanar faces (52, 54 and 56, 58) permeability ratio between the central disc portion (48) and the rim portion (44) is of at least 31. Additionally, the central portion exhibits a density up to about 70 percent of the density of solid material of the same composition while the density of the rim portion is greater than that of the central portion and is up to about 95 percent of that of solid material of the same composition.</p> |
