PCB 127 is a ready-to-use standard solution at 100 µg/ml in isooctane, presented as a 1 ml glass unit for chromatography and environmental analysis. Part of the ROTI®Star line from manufacturer Carl ROTH, it delivers a single-congener reference for gas-chromatographic determination of polychlorinated biphenyls. The isooctane-based preparation has a density of 0,69 g/cm³, a flash point of −12 °C and a boiling point of 99,2 °C, parameters that inform storage, transfer and instrument introduction. At 100 µg/ml the solution is convenient for direct calibration points or modest dilution into working standards. It fits workflows in residue analysis, environmental monitoring and GC method development where PCB 127 must be tracked independently. The compact glass pack reduces unused volume and supports orderly inventory of congener standards. Clear concentration and solvent identity help laboratories maintain consistent documentation across PCB screening and confirmatory assays. This article is part of Chromatography standards (GC, HPLC, pesticides), in Analytical standards & reference materials. Key features Pack size: 1 ml glass Density: 0,69 g/cm³ Flash point: −12 °C Boiling point: 99,2 °C Concentration: 100 µg/ml in isooctane Technical Information Sheet: Safety Data Sheet: