Patent ID: 8585970

Claim:
A cartridge for solid phase extraction of an analyte from a liquid, comprising a cartridge body bounding a passage for retaining a sorbent, the passage extending from a first end face to a second end face opposite the first end face of the cartridge body, the first and second end faces facing in diametrically opposite directions, wherein the cartridge body comprises a core of a first material extending around the passage and sealing rings of a second material, extending around an axis of the passage, at the first and second end faces, surface portions of the sealing rings constituting surface portions of the first and second end faces, a circumferential ring or sleeve of the second material extending around the passage and the core, the circumferential ring or sleeve having an outer surface constituting at least a portion of a circumferential surface of the cartridge body and a sprue mark on said circumferential surface, the second material integrally connecting the circumferential ring or sleeve with at least one of the sealing rings via at least one channel in the core, and the first material is stronger and stiffer than the second material.