For Corrosive Fluid Valves - VALQUAВ® No. 7233. Coil packing made of PTFE fiber yarns, processed with PTFE dispersion, then braided into a square cross-section. Features: Made of 100% PTFE, and therefore resistant to almost all fluids. Best suited for chemical use valve shaft seals for handling corrosive fluids. When low torque or gas sealing properties are required, use the following products which are treated with lubricating oil: No. 7233 (O) for general gas-based fluids. No. 7233 (SO) for low-temperature use of inflammable gas and liquefied gas. No. 7233 (FO) for gas susceptible to burning, such as oxygen and ozone. Compliant with the Food Sanitation Law, and the Regulations concerning Food & Additives.