Lab professionals and researchers! This case of Kimble phenolic screw caps is exactly what you need for your laboratory work. These black phenolic caps with 15-415 GPI thread finish are seriously durable - they're designed to withstand the temperature extremes and steam exposure of autoclaving without degrading.

The cemented-in rubber liner stays securely in place even through repeated sterilization cycles, thanks to special adhesive formulated for autoclave conditions. These caps are reusable, which makes them cost-effective for labs that do frequent sterilizations. They're perfect for use with disposable culture tubes and centrifuge tubes, providing a secure seal that prevents contamination while allowing for easy access when needed.

The phenolic material is specially formulated to resist chemical exposure and maintain its integrity through multiple uses. Having a case of 1000 means you're stocked up for ongoing lab work without constantly reordering. The black color makes them easy to identify and track in your lab inventory. Whether you're working in microbiology, cell culture, or any application requiring sterile conditions, these caps deliver reliable performance batch after batch.

The thread design ensures a tight seal without cross-threading issues, and the rubber liner provides that extra security against leaks or contamination. They meet ASTM Specification E982 standards, so you know you're getting laboratory-grade quality. For research facilities, educational labs, or any setting where sterile technique matters, having quality caps like these is essential for maintaining protocol integrity and getting consistent, reliable results. Stock up now and keep your lab running smoothly!