Trace Impurities
| ELECTRICALLY FUSED | ELECTRICALLY FUSED | FLAME FUSED | FUSED SILICA |
Ag | — | — | — | <2 |
Al | 14 | 14 | 15 | <25 |
As | <.002 | <.002 | — | <15 |
Au | — | — | — | <1 |
B | <0.2 | <0.2 | — | <10 |
Ba | — | — | — | <1 |
Be | — | — | — | <0.5 |
Bi | — | — | — | <0 |
Ca | 0.4 | 0.4 | 0.5 | <15 |
Cd | <0.01 | <0.01 | — | <0.3 |
Co | — | — | — | <0.5 |
Cr | <0.05 | 0.05 | <0.01 | <1 |
Cu | <0.05 | <0.05 | <0.01 | <2 |
Fe | 0.2 | 0.2 | 0.1 | <20 |
Ga | — | — | — | <0.5 |
K | 0.6 | 0.6 | 0.2 | <5 |
Li | 0.6 | 0.6 | 0.2 | <7.2 |
Mg | 0.1 | 0.1 | — | <5 |
Mn | <0.05 | <0.05 | 0.01 | <1 |
Mo | — | — | — | <1 |
Na | 0.7 | 0.7 | 0.1 | <187 |
Nd | — | — | 0.1 | — |
Ni | <0.1 | <0.1 | — | <5 |
P | <0.2 | <0.2 | — | <50 |
Sb | <0.003 | <0.003 | — | <0.5 |
Sr | — | — | — | <0.5 |
Th | — | — | — | <0.5 |
Ti | 1.1 | 1.1 | 1.3 | <10 |
U | — | — | — | <1 |
V | — | — | — | <1 |
Y | — | — | <0.1 | — |
Zn | — | — | — | <5 |
Zr | 0.8 | 0.8 | 1.3 | <5 |
OH | <5 | <5 | 170 | <1000 PPM |