Spark cartridges are guaranteed to provide superior performance and ease of use. These cartridges are constructed for high-pressure (> 4000 psi) on-line extraction procedures. This unique feature allows the use of a wide range of sorbent materials and particle sizes. These chromatographically efficient SPE cartridges combine high extraction capacity with small elution volumes to minimize band broadening and consequently provide increased assay sensitivity. Each cartridge is constructed of chemically inert materials for sample and analytical technique compatibility, and the proprietary end frits maintain the integrity of every individual cartridge being processed. A large assortment of bonded silica and polymeric stationary phases is available.