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Glass
Performance Introduction |
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¡¡¡¡All glass instruments
we mention here are produced using glass of
different performance, according to the specific
technical demand of instrument in practical
application. General performance and main
chemical and physical performance concerning
various glass as follows.
¢ñ.GG17 Refractory
Glass
¡¡¡¡The performance of GG17 refractory glass
fully complies with ISO3583 international
standard. As a kind of high-borosilicate glass,
it enjoys excellent physical and chemical
property. Its silicon content is above 80%,
contributing to particularly stable inner
structure of glass and favorable mechanical
and chemical property. Owing to low-fever
expansion coefficient adaptable to distinct
temperature variation as well as good lamp
flame processing property, it turns out to
be a satisfying material for various lab-use
glass heaters, sophisticated glass instruments,
chemical equipments and glass of pressure
water meters etc.
Detailed physical
and chemical property as follows: |
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silicon content |
above 80%
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strain temperature |
520¡æ |
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annealing temperature |
560¡æ |
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softening temperature |
820¡æ |
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refractive index |
1.47 |
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light transmittance (2mm) |
92£¥ |
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elastic modulus |
67KNmm-2 |
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tensile strength |
40-120Nmm-2 |
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optical constant of glass strain |
3.8¡Á10-6mm2 /N |
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process temperature(104dpas) |
1220¡æ |
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coefficient of linear expansion(20-300¡æ) |
3.3¡Á10-6K-1 |
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thickness(20¡æ) |
2.23gcm-1 |
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specific heat |
0.9Jg-1K-1 |
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thermal conductivity |
1.2Wm-1K-1 |
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(ISO 719) water resistance |
grade 1
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(ISO 195) acid resistance |
grade 1 |
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(ISO 695) alkali resistance |
grade 2 |
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temperature variation adaptability
glass rod method¡¡glass rod¦µ6¡Á30mm |
300¡æ |
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Notes
for GG17 Glass |
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a. Instrument made from GG17
glass, if heated or pressurized for a long
time, will work safely at a temperature no
higher than its strain temperature(520¡æ).
When heated up to annealing temperature, it
is not liable to deform. And the temperature
will rise to 600¡æ in a short time if it is
placed on suitable bracket without inner pressure.
In this case, the instrument should cool down
slowly in order to eliminate the emergence
of permanent stress.
b. Calculation of safe working pressure of
GG17Glass tube (at 25¡æ) as follows:
P=140T/D¡¡P refers to safe working pressure,
and its unity is kg/cm2
T refers to wall thickness of glass
tube, D refers to internal diameter of glass
tube, and its unity is mm
The above formula is not applicable to flat-bottomed
glass tube
c. Chemical Composition of GG17 Glass: (%) |
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| SiO2 |
B2O3 |
Al2O3 |
Na2O |
K2O |
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80.5 |
12.8 |
2 |
4 |
0.4 |
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¢ò.'Ninth
Five' Heat-resistant Glass
¡¡¡¡'Ninth Five' heat-resistant glass is a kind
of glass with low alkali content and high
boron and silicon content, free from elements
like calcium, magnesium, zinc and platinum.
It features excellent physical and chemical
property and is applied to manufacture manifold
glass instruments.
Detailed physical
and chemical property as follows: |
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silicon content |
79£¥ |
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strain temperature |
520¡æ |
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annealing temperature |
540¡æ |
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softening temperature |
755¡æ |
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coefficient of linear expansion(20-300¡æ) |
3.9¡Á10-6K-1 |
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(20¡æ) thickness |
22.8gcm-1 |
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temperature variation
adaptability (glass rod method) |
220¡æ |
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waterproof |
grade 1 |
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acid resistance |
grade 1 |
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alkali resistance |
grade 2 |
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¢ó.No.2
Hard Material Glass
¡¡¡¡No.2 hard material glass also belongs to
borosilicate glass. It not only enjoys excellent
physical and chemical property as excellent
as No.1 hard material glass, but also owns
favorable lamp flame processing property.
Hence, it is used to make various elaborate
glass instruments for lab use, such like fractionating
tube, condenser tube, distiller etc. |
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Physical
and chemical property of No.2 hard material
glass
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silicon content |
77£¥ |
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softening temperature |
750¡æ |
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annealing temperature |
500¡æ |
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strain temperature |
470¡æ |
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(20-300¡æ) coefficient of linear expansion |
48¡Á10-7/¡æ |
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specific gravity |
2.36g/cm3 |
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water resistance experiment |
Boil 0.3-0.5mm glass
particles in water for one hour, dip
0.01N HCI. The loss of weight is 0.04mg/g. |
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acid resistance experiment |
Boil in 6.15N HCI
for three hours. The loss of weight
is 0.33mg/100cm2. |
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alkali resistance experiment |
Boil in mixed liquor
of Na2CO3 and
NaOH at the temperature of 97.5¡À0.5¡æ
for three hours. The loss of weight
is 90mg/100cm2.
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¢ô.No.4
Soft Material Glass
¡¡¡¡No.4 soft material glass is a kind of excellent
sodium alkali glass. Thanks to excellent chemical
property and certain mechanical strength,
it is suitable to make glass instruments with
thick wall and products such as measuring
vessel, desiccator, bell jar, reagent bottle
and specimen bottle, owning favorable fastness
and resistance against chemical erosion. |
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Physical
and chemical property of No.4 Soft Material
Glass
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silicon content |
75£¥ |
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softening temperature |
668¡æ |
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annealing temperature |
470¡æ |
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strain temperature |
430¡æ |
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(20-300¡æ) coefficient of linear expansion |
88¡Á10-7/¡æ |
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specific gravity |
2.38g/cm3 |
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water resistance experiment |
Boil 0.3-0.5mm glass particles in
water for one hour, dip 0.01N HCI. The
loss of weight is 0.26mg/g. |
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acid resistance experiment |
Boil in 6.15N HCI for three hours,
the loss of weight is 0.33mg/100cm2 |
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alkali resistance experiment |
Boil in mixed liquor
of Na2CO3 and
NaOH at the temperature of 97.5¡À0.5¡æ
for three hours. The loss of weight
is 60mg/100cm2. |
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¢õ.No.5
Soft Material Glass
¡¡¡¡No.4 soft material glass is a kind of excellent
sodium alkali glass, holding favorable chemical
property and performance in lamp flame processing.
Instruments made from this glass, such as
buret, graduated pipette, suction pipet etc.
is resistant to chemical erosion to some extent.
Thus, it is a good material for glass measuring
vessels. |
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Physical
and Chemical Property of No.5 Soft Material
Glass
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silicon content |
71£¥ |
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softening temperature |
698¡æ |
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annealing temperature |
480¡æ |
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(20-300¡æ) coefficient of linear expansion |
89¡Á10-7/¡æ |
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specific weight |
2.39g/cm3 |
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water resistance experiment |
Boil 0.3-0.5mm glass particles in
water for one hour and then dip 0.01
HCI. The loss of weight is 0.25mg/g. |
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acid resistance experiment |
Boil in 6.15N HCI for 3 hours.
The loss of weight is 0.5mg/100cm2. |
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alkali resistance experiment |
Boil in mixed liquor of Na2CO3
and NaOH at the temperatuare
of 97.5¡À0.5¡æ for three hours. The
loss of weight is 60mg/100cm2. |
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