This standard specifies the method for measuring the density of rare earth trichromatic phosphors used in lamps. This standard applies to the determination of the density of rare earth trichromatic phosphors used in lamps.
GB/T 14634.5-2002 history
2010GB/T 14634.5-2010 Test methods of rare earth three-band phosphors for fluorescent lamps.Part 5:Determination of density
2002GB/T 14634.5-2002 Test methods of rare earth three-band phosphors for fluorescent lamps-Determination of density