Proprietą chimiche
Quartz glass is quasi inert to most chemical compounds. Only
hydrofluoric acid and phosphoric acid (H3PO4) are able to
chemically attack quartz glass. Pure metals do not react with
quartz glass. Exceptions are the alkali and alkaline earth
metals whose compounds affect the material even at high
temperatures due to diffusion. They are the cause for
devitrification. It is recommendable to remove fingerprints from
quartz glass with alcohol before heating, as they always contain
small amounts of alkali salts.
*
Element/compound does not
react with quartz glass
◔
Reacts only above the temperature
indicated
)
Only the melt reacts with quartz glass
(
Element/compound reacts with quartz glass
|
Elements |
|
*
|
Ag |
 |
|
◔
|
Al |
from 700 to 800 °C rapid
reaction |
|
*
|
Au |
|
|
*
|
Br |
|
|
◔
|
C |
only above 1.500°C |
|
◔
|
Ca |
only above 600°C |
|
*
|
Cd |
|
|
◔
|
Ce |
only above 800°C |
|
*
|
Cl |
also with heat and humidity
no reaction |
|
(
|
F |
only in humid state |
|
*
|
Hg |
|
|
*
|
J |
|
|
(
|
Li |
only above 250°C |
|
◔
|
Mg |
from 700 to 800°C rapid
reaction |
|
*
|
Mn |
|
|
*
|
Mo |
|
|
*
|
Na |
reacts only in vapor state |
|
(
|
P |
|
|
*
|
Pb |
|
|
*
|
Pt |
|
|
◔
|
S |
above 1.000°C poor reaction |
|
)
|
Si |
|
|
*
|
Sn |
|
|
*
|
Ti |
|
|
*
|
W |
|
|
*
|
Zn |
|
|
Acids |
|
*
|
H2SO4 |
|
|
*
|
HNO3 |
|
|
*
|
HCl |
|
|
(
|
HF |
but weaker than with
ordinary glass |
|
(
|
H3PO4 |
but weaker than with
ordinary glass |
|
*
|
Organic acids |
|
|
Gases and Vapors |
|
*
|
HCI |
|
|
*
|
H2; N2; O2 |
|
|
*
|
NO2; SO2 |
|
|
*
|
CO |
|
|
Oxides |
|
◔
|
Al2O3 |
only above 1.200°C |
|
◔
|
BaO |
only above 900°C |
|
◔
|
CaO |
only above 1.000°C |
|
◔
|
CuO |
only above 950°C |
|
◔
|
Fe-oxi-des |
only above 950°C |
|
◔
|
MgO |
only above 950°C |
|
)
|
PbO |
|
|
◔
|
ZnO |
only above 800°C |
|
◔
|
Basic oxides |
acceleration of
divitrification anly above 800°C |
|
Salts |
|
)
|
BaCl2 |
|
|
◔
|
BaSO4 |
only above 700°C |
|
)
|
Borate |
|
|
◔
|
BCI3 |
only above 900°C |
|
)
|
KCI |
promotes devitrification |
|
)
|
KF |
|
|
)
|
NaCl |
|
|
(
|
Na-metaphosphate |
|
|
(
|
Na-polyphosphate |
|
|
*
|
Na2SO4 |
|
|
(
|
Na-tung-state |
promotes devitrification |
|
)
|
Nitrate |
|
|
◔
|
Pt-ammo-niumchloride |
only above 900°C |
|
)
|
ZnCl2 |
|
|
◔
|
Zn-phosphate |
light at 200°C considerable
at 1.000°C |
|
◔
|
Zn-silicate |
only above 1.000°C |
|
Applicazioni
specifiche >>
Proprietą del vetro di quarzo
Proprietą meccaniche
Proprietą termiche
Viscositą
Proprietą elettriche
Proprietą ottiche
Proprietą chimiche
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