NMR tubes, 3 and 5mm borosilicate glass 3.3, standard The NMR tubes have precise tolerances for consistent high accuracy. Most suitable for autosampling NMR systems and high-throughput NMR. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements -Borosilicate glass 3.3 -Economy quality -One end closed, rim fire polished -Applicable until 600MHz Please order closing caps separately.