Continental Trade Sp. z o. o.

Technical glass

Capillaries

Pipes with a very small internal diameter are called capillaries. In these tubes there is strong interaction of the liquid (gas) and the walls, causing capillarity phenomena. Tubes of this type are characterized by high precision. For their production is used borosilicate Duran glass (see. here).

Below are shown dimensions of the capillaries of circular cross-section. Standard capillary length is 1500 mm.

We also have capillaries of other shapes (oval, triangular), also known as profiled capillaries. These are discussed in Chapter Our offer/Technical glass/Borosilicate tubes, rods and capillaries/Special products on page Profiled capillaries.

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Capillaries - available sizes.

Capillaries
Outside
Diameter
Inside
Diameter
Weight of
1 piece
Pack
quantity
Pack
weight
[mm] [mm] [g]   [kg]
4 ±0,16 0,8 ± 0,08 40 250 10
5 ±0,16 0,4 ± 0,08 65 154 10
0,6 ± 0,08 65 154 10
0,8 ± 0,08 64 156 10
1,2 ± 0,08 62 161 10
6 ±0,16 0,4 ± 0,08 94 104 10
0,8 ± 0,08 93 108 10
1.2 ± 0,08 91 110 10
1,7 ± 0,10 87 115 10
2,2 ± 0,10 82 122 10
2,7 ± 0,10 75 133 10
7 ±0,18 0,8 ± 0,08 127 79 10
1,2 ± 0,08 125 80 10
1,7 ± 0,10 121 83 10
2,2 ± 0,10 116 86 10
2,7 ± 0,10 110 91 10
3,0 ± 0,10 105 95 10
8 ±0,18 0,8 ± 0,08 166 60 10
1,2 ± 0,08 164 61 10
1,7 ± 0,10 160 63 10
2,2 ± 0,10 155 65 10
2,7 ± 0,10 149 67 10
3,0 ± 0,10 144 69 10
9 ±0,18 0,8 ± 0,08 211 47 10
1,2 ± 0,08 209 48 10
1,7 ± 0,10 205 49 10
2,2 ± 0,10 200 50 10
2,7 ± 0,10 194 52 10
3,0 ± 0,10 189 53 10

Above data refer to DURAN borosilicate  capillaries.

NOTE! The above mentioned borosilicate capillaries are sold in standard lengths of 1 500 mm.  However, on customer request we can prepare capillaries of different lengths.

If you can't find correct size - contact us.

Below were reminded properties of DURAN glass described on page Borosilicate glass in section Our offer/Technical glass /Types of materials

DURAN® - DIN 7080

It is a glass highly resistant to water, neutral and acidic environment, solutions and concentrated acid and alkalies, chlorine, bromine, iodine and organic substances. The chemical resistance of the glass Duran® resistance is higher than most metals, even during a prolonged period and at higher temperatures (> 100 ° C). Only hydrofluoric acid, concentrated phosphoric acid, and strong alkaline materials may cause   decrease the surface of glass (glass corrosion) of temperature above 100 ° C.

Maximum working temperature of glass DURAN® is 500 °C. At temperatures above 525 ° C, glass begins to soften, and a temperature above 860 ° C liquefies. May be cooled to a very low freezing temperatures and is therefore suitable for use in contact with liquid nitrogen (about -196 ° C). In general DURAN® products are recommended for use down to - 70 °C, while defrosting must be ensured that the temperature difference does not exceed 100 K.

DURAN® glassware is suitable for use in microwaves.

DURAN® glass is highly resistant to changes of temperature  (ΔT = 100 K). Thanks to the very low coefficient of linear expansion (3.3 x 10-6 1/K) in the articles of this material in practice there are no stresses during rapid temperature changes (e.g. not crack the vessel when filled with boiling water).

DURAN ® is a commercial version 3.3 borosilicate glass, hence the majority of the properties and composition is similar to the type of glass.

Composition

SiO2  81% Composition of DURAN
B2O3  13 %
Na2O + K2O 4 %
Al2O3  2%

 

Properties:

Density (@ 25 °C) 2.23 g/cm3
Modulus of elasticity (Young’s) 63 * 103 N/mm2
Poisson’s ratio 0.2
Coefficient of linear expansion 3.3 * 10 -6 °C
Thermal conductivity 1.2 W/(m K)
Transformation temperature T(ISO 7884-8) 525 °C
Glass temperature for density dPa s 1013     560 °C  (annealing point)
10 7.6    825 °C  (softening poin)
10 4    1250 °C  (working point)
Thermal shock Δ 100 °C
Index of refraction (@ 380 - 780 nm) 1.474 
Working temperature (maximum):
 - long term 300 °C 
 - temporary (< 10 minutes) 500 °C

Log of the electric volume resistivity:    
- at 250°C
- at 350°C

 
8.0
6.5

Chemical resistance

Due to the high content of silica (SiO2), DURAN glass is very resistant to water, acids, organic solvents and halogens. Only hydrofluoric acid, hot concentrated phosphoric acid and strong alkaline solutions cause significant corrosion of the glass. 

Hydrolytic resistance

   Acc.   ISO 719 (@ 98 °C): class HGB 1 
   Acc.   ISO 720 (@ 121 °C): class HGA 1 

Alkali resistance
   Acc. DIN 52 322 (acc.  ISO 695): class A2

Acid resistance
   Acc. DIN 12 116 (ISO 1776): class 1

Dielectric properties

@ 25° C and 1 MHz: 
    Dielectric constant εr=4.6 
    Dielectric loss factor    tan δ= 37*10-4

   

Optical properties

Spectral Transmission
Spectral Transmission DURAN

DURAN® glass is generally available in the form of tubes, rods, capillaries or laboratory glassware and apparatus. 

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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