The test is performed at two controlled relative humidity conditions, an upper humidity of 50% and a lower humidity of 15%, in order to see the changes in resistivity as humidity falls. In pharmaceutical production many of the processes operate at low humidity. The resistivity value will determine whether a material is conductive, static dissipative or insulating. With the latter case, care must be taken during movement of the powder to minimise charge accumulation which could increase the risk from electrostatic spark discharges.
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Charge Relaxation Time for Powders
The Charge Relaxation Time compliments the Powder Volume Resistivity measurement as it indicates how long a material can retain its electrostatic charge.
Get in touch
Please call on +44 (0)1962 840570 and discuss your testing needs with Mike Weaver our Technical Manager (firstname.lastname@example.org) or Gavin Rogers our Laboratory Manager (email@example.com)