in design to the 420530 series 40-60 micron porosity glass frit at the lower end to act as a support for column packing material replacement stopcock plug is 821001 manufactured from 33 expansion, low extractable borosilicate glass conforming to usp type i and astm
Porosities of sintered glass filters are determined dynamically: air is forced through a frit just immersed in water until a bubble goes through. the pressure required correlates with the pore size, according to theory: pore diameter (in microns) = 30 * surface tension (in dynes/cm) /
Ust glass is the premier supplier of borosilicate glass. with 3 warehouses around the country we are always heavily stocked. check out our selection of clear and color borosilicate tubing, rods, ground joints and dichro sheets plus a variety of laboratory and industrial glass.
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