WHEATON Polypropylene Open Top Screw Cap with Bonded PTFE/Silicone Septa, 24-400, 500-pk

These WHEATON open top screw caps are engineered for laboratory applications requiring reliable sample access and chemical-resistant sealing. The 24-400 thread size fits standard laboratory vials and bottles, while the bonded PTFE/silicone septa provides excellent compatibility with a wide range of solvents and reagents. Ideal for HPLC sample preparation, chromatography applications, and general laboratory storage where repeated needle penetration or pipette access is required.

• Material: Polypropylene cap with bonded PTFE/silicone septa for superior chemical resistance
• Thread Size: 24-400 standard finish for universal compatibility with laboratory vials
• Open Top Design: Allows direct access to septa for needle injection or pipette sampling
• PTFE Liner: Chemically inert surface ensures sample integrity and prevents contamination
• Quantity: 500 caps per package for high-throughput laboratory operations
• SKU: W240847