Wilmad-LabGlass's NMR Precision Tubes are manufactured from borosilicate glass that meets the requirement of Type 1 Class A glass from ASTM E438. Precision Tube has 3 fold less paramagnetic contamination comparing to the Economy tube, and can be operated safely at temperature up to 230 ˚C, and within a temperature step of 120 ˚C. Precision tube is rated as hydrolytic class 1, which states that the inner surface is resistant to strong acid and base at ambient temperature. 

The 505-PS series Precision tubes are precisely grinded and polished on outer diameter only. The inner diameter has a standard tolerance of 0.2 mm, which would not be compatible with the WGS-5BL insert. All the other Precision tubes whose part numbers contains -PP have been grinded on both inner surface and outer surface.