Rock crystal and grain quartz are used as raw material
for producing fused quartz glass tubes of the following types:
Designation of fused quartz glass tube type:
(Î)-one stage process
(Ä)-two stages process
ÒÊÃÄÀ - fused quartz glass tube with diameter of 5-300 mm. It may be
applied for ultra pure substances, reagent, appliances of special destination,
light resources, electric devices.
ÒÊÃÄÁ, ÒÊÃÎÁ, ÒÊÃÎÀ - fused quartz glass tubes with diameter of 5-300 mm.
They can be used for light resources, electronic devices.
ÒÊÝÎÀ, ÒÊÝÎÁ - fused quartz glass tubes with diameter of 5-40 mm.
These tubes can be applied for light resources, electronic devices.
ÒÊ - fused quartz glass tube with diameter of 5-40 mm. It can be applied
for producing chemical products and consumer wares.
ÒÊ - fused quartz glass tube. It is produced of transparent quartz
glass with non-limited indices on bubbles and inclusions; Technical
characteristics should be defined more exactly by the customer's request
if necessary. Other types of fused quartz glass tubes are of higher quality.
Quality characteristics are being regulated by ÒÓ-5932-014-00288679-01.
Additional quality properties and unimportant defects of fused quartz
glass tubes should be discussed with the customer if necessary.
There isn't to be the trace of crystallization by keeping fused
quartz glass tube at temperature of 1000+-20oC during 2 hours
with the consequent cooling at the air.
Fused quartz glass tubes are thermally stable.
At heating temperature (see below) and with subsequent cooling in water
at temperature not more than 25°C fused quartz glass tubes are not to
be cracked, cut, broken off after 15 heating shifts
1000±20îÑ with wall thickness from 0.6 to 3.0 mm
800±20îÑ with wall thickness from 3.0 to 4.0 mm
600±20îÑ with wall thickness more than 4.0 mm
Fused quartz glass tube is stable to darkening.
Spectral transmission of fused quartz glass tubes with diameters from
10 to 70 mm is not to be less than:
wave-length, l nm
Spectral transmission with loss reflection index for glass layer of 1 mm thickness