JIS Test Powders 2 Glass Beads

Reference standard:JIS Z 8901

Material used：

GBL：Soda lime glass

GBM：Barium-titanate glass

Chemical composition

GBL(Soda lime glass)

Chemical composition	% ( mass )
SiO2	70～73
Na2O	12～15
CaO	7～12
MgO	1～5

GBM(Barium-titanate glass)

Chemical composition	% ( mass )
TiO2	33～38
BaO	41～48
SiO2	10～14
CaO	4～8

Particle density：

GBL‐2.1～2.5g/cm3
GBM‐4.0～4.2g/cm3

Particle size at 90%,50%,10% oversize mass basis(%) on the cummulative distribution curve

Class	90%	50%	10%
GBM　20	18 min.	22±1.0	26 max
GBL 30 GBM 30	26 min.	30±1.0	34 max
GBL 40 GBM 40	37 min.	41±1.0	45 max
GBL 60	55 min.	59±1.0	63 max
95 min.	100±1.0	105 max

Refractive index：

GBL: 1.51～1.53，　GBM: 1.92～1.94

The non-spherical particle,opaque particle,agglomerated particle, and foreign matter are less than 5% in total.