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Mark tubes
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 Crystal preparation and filling device with additional cooling unit
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| Crystal preparation and filling device with additional cooling unit |
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The Hilgenberg crystal preparation and filling device according to Dr. Scheidstegerⓒ is a glass device with which
it is possible to transfer sensitive crystals easily from the crystallization dish to the capillary.
The whole apparatus consists of a cooling vessel and the actual filling device that is integrated into the cooling vessel.
The apparatus can be used with or without cooling, as required.
The device can be evacuated with a high vacuum pump. It is ventilated through a two-way cock with olive. Crystals are
filled in through the filling cut. The upper opening of the device therefore remains closed during the whole filling process.
The crystals are prepared via a lateral cut with rubber diaphragm sluice. The sequence of the works is described
in a detailed manual.
We offer a wide range of different mark tubes for use on this apparatus. |
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Advantages of the crystal preparation and filling device
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With a simple change of capillary, you can fill in as many crystals as you wish, one after another. |
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Crystals sensitive to air and temperature as well as solvate crystals are chosen under a microscope, prepared and then
filled into capillaries. |
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The crystals are transferred directly and without any contact to air from the crystal supply vessel (e.g. Schlenk vessel)
via the preparation space into the capillary. |
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The integrated cooling system allows it also to fill in temperature-sensitive crystals safely in the laboratory. |
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Simple handling |
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KPA under a stereo microscope
with luminous source |
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Specific solution for macro molecules
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For the examination of macro molecules and proteins we have developed, in co-operation with the University of Paderborn,
special glass capillaries with a particularly large diameter. These capillaries can serve as substitute for expensive
sapphire chambers. For the examination of macromolecules by means of synchrotron radiation we have developed
a capillary of 4.1 mm diameter and a wall thickness of only 50 μm. Aside from this size, there are also sizes
between 2.1 and 5.2 mm available. |
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The thin-walled tubes have the following advantages
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Low absorption |
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High heat conductivity |
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Minor scattering |
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Evenly thin walls |
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Low weight |
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Double funnelled mark-tubes
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These mark-tubes are well-suited for flow measurements. The measuring rangein the centre of the capillaries has only approx.
10 μm wall-thickness.However, the funnels are made up of thick-walled material. It makes it mucheasier to assemble
the double funnelled mark-tubes into a liquid closedloop.
To adapt these capillaries, thin hoses are suitable. They can beplaced with liquid Teflon (PTFE) on both sides of the funnels. |
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Following some underlying data about our double funnelled mark-tubes
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funnel outside-Ø 3.0 mm |
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funnel inside-Ø 2.4 mm |
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total length 80 mm |
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measurement range Ø 0.5/0.7/1.0 mm |
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measurement range length 30 mm |
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Substrate borosilicate glass ( 0500 ) |
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Glass cannulas for mark tubes
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In order to fill mark tubes with liquid samples, we have developed special glass needles. The thinnest needle has a diameter of
less than 0.1 mm. So, even the finest mark tubes can be filled without any problem. The needle can be connected with a
common disposable syringe or a micro litre syringe using a standard Luer connection.
The needle is made of borosilicate glass. The shaft is made of plastic with the needle glued in.
There are different diameters available. |
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Rods and fibres for fixing
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In order to simplify the filling of mark tubes we offer special rods and fibres on the tip of which you can introduce
the sample into the mark tube. Fibres with a diameter of less than 0.1 mm can even be introduced into the smallest mark tubes.
This type of rod we produce mainly of borosilicate glass 3.3. If you would like to have fibres and rods to melt down,
we can suit them to the material of the mark tube. |
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Micro hand torch
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This small micro hand torch is very well suited for melting down mark tubes precisely and securely.
Since the flame can be adjusted to a very small size, it is possible to melt down the mark tube precisely at one point
without heating the capillary extensively, as it is the case with common burners and lighters.
Since it is run with hydrogen and oxygen or propane gas and oxygen, it is possible to produce a very hot flame,
which makes it even possible to work on quartz glass.
This torch is a very versatile tool which makes it possible to work with nearly every glass quality,
from simple flame treatment to more complicated tasks. |
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Advantages of the micro hand torch
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Fine, concentrated needle flame |
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High heating power |
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Usage with mixed gases |
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2 separate needle valves |
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Incl. a fine nozzle |
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Length of the blowpipe >130 mm (excluding nozzle) |
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The hand torch consists of a mixing chamber with two gas inlets also suitable for aggressive media like hydrogen and oxygen. The flow of the gases can be separately and precisely adjusted with two needle valves at the head of the mixing chamber. The blowpipe will be delivered completely with a bended nozzle that has a borehole of 0.3 mm.
On option, you can also get a table tripod which will make work much easier for you. Using the tripod you have both hands free to hold the mark tube while melting it down. In addition, the blowpipe stands firm and secure and cannot blur.
For specific needs we offer a special stainless steel nozzle with a ruby nucleus in the head. Its nozzle has a mouth of only 0.18 mm, which allows extremely small and hot flames.
In order to produce more heat at the same time, there is a distributor (optional) that gives the possibility of distributing the flow of gas at the head of the blowpipe to two nozzles. |
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Areas of application
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Melting down capillaries and mark tubes |
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Sealing and fire-glazing glass capillaries |
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Precision soldering |
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Zircon blades and holders
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For the cutting of glass capillaries we need special blades of a material that is harder than glass. Usually,
a diamond charged blade is used, which is particularly hard.
Zircon oxide blades are an inexpensive alternative that is easy to use.
They are also very hard and can be sharpened up at any time.
These blades are particularly suitable for cutting glass capillaries since the flat blade can be drawn over the glass surface with
high precision. Afterwards, the capillaries can be separated at the break. This technique also works with extremely fine mark
tubes that have a wall thickness of only 0.01 mm.
The blades can be optimally clamped into our aluminium holders and be used freely with one hand only.
For your convenience, please consider to add this practical tool to your order.
With this tools you can cut capillaries precisely by yourself. |
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