Borosil® Reusable Heavy Duty 4mL Test Tubes with Beaded Rim (13 x 55mm) - 800 Pack for Laboratory, Science Experiments & DIY Projects

Borosil Reusable Heavy Duty Test Tubes are constructed from mechanically strong, low-extractable borosilicate glass. The flame-polished, beaded rim confers strength, preventing chipping and cracking. Thick, uniform walls, excellent heat resistance, and rounded bottoms mean tubes can be reused without issue. Borosil Reusable Heavy Duty Test Tubes comply with ISO/DIN 4142. Available in a variety of sizes from 3mL (10mm x 75mm) to 170mL (38mm x 200mm). In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil Type 3. 3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil Glassware is stress-free and incredibly resistant to thermal shock.