Black Teflon seals are PTFE with a carbon fill, this seal is a very good general purpose seal for any solvent.
Gold plunger seals are made of UHMW-PE (Ultra High Molecular Weight Polyenthylene) with fill that gives it a gold appearence. The seal provides good seal life and does not shed particles like that of other seals. The gold seal is insert to all common HPLC solvent mixes
NCI Manufactures : "HPLC Column, SPE Cartridges ,Flash Cartridges, Syringe Filters, Chromatography Vials & Packing Vials".
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