MI-3921 is interlocked braided from Dry Pure PTFE Fiber yarn without any lubricant or additives. It ensures safety & purity of the medium with no contamination of the fluid media. It serves as an excellent packing for Oxygen & Hydrogen services. This is a self lubricating packing with very low coefficient of friction and as such safeguards the parent equipments from erosion during operation. The packing needs very little gland adjustment after initial installation and is inert to almost all known chemicals except for some Molten Alkali Metals and Aquaregia.