The best choice for quality results at the lowest cost
US EPA 1664A/B, ISO-11349 and Standard Methods 5520G require the use of n-hexane as the extraction solvent and gravimetry as the determinative technique. Alternative extraction and concentration techniques are allowed, provided that the performance and specifications are met. In addition, QC procedures designed to monitor precision and accuracy are an important part of any good method and are met with Pacific-brand disks.