Borosil 1625 - Relative Density Bottles (Pyknometer) With I/C PTFE Stoppper are expertly crafted from heavy-walled 3.3 borosilicate glass, ensuring exceptional chemical and heat resistance. Designed to withstand autoclaving, relative density bottles are used to determine the density of liquids and are calibrated to hold a certain volume. Available on EnvMart, these Laboratory Glasswares are crafted from high-quality materials using advanced techniques to ensure precision and durability. Borosil Glasswares are trusted for their accuracy and reliability, making them a preferred choice in laboratories for various scientific applications.