HILGENBERG GMBH

Analogous to conventional steel needles, as used in medical applications, we manufacture special needles with a glass capillary instead of a metal cannula. In many applications, glass capillaries offer decisive advantages compared with metal cannulas: absolutely smooth internal and external surfaces cannulas smaller than 500 µm are highly flexible diameter of less than 200 µm are possible – down to 70 µm inert, chemically resistant material, also at high temperatures transparent, for observations in the cannula very precise internal and external dimensions glass reservoirs can be integrated in the needle numerous configurations, applications, and customer-specific designs are possible The only disadvantage of glass needles compared with their steel counterpart is their lower mechanical strength. Standard versions Capillary is mounted directly in the syringe coupling Capillary is enclosed in a sheathing tube to increase its strength, but only the very fine capillary projects at...

We have developed special glass cannulas that greatly simplify filling our test tubes with liquid samples. Our thinnest cannula has a diameter of less than 0,1 mm. This enables even the finest test tubes to be filled without problems. A standard Luer connection enables the cannula to be fitted to conventional one-way syringes or microliter syringes. Our filling needles are made of borosilicate glass, whereby the shaft consists of plastic into which the needle is bonded. Various diameters are available. Syringe needles for filling Mark-tubes with liquids

As a special service, we offer glass tubes and cylinders with calibrated inside diameters. Hereby, a special tool is used to bring the internal diameter precisely to the desired shape and dimension. Apart from the standard circular shape, the tubes can also be square or conical. Moreover, the outer tube diameter can be calibrated by means of cylindrical grinding. This grinding procedure results in a matt outer surface, which can be corrected by subsequent “technical polishing”.

Cloning cylinders or rings are ideally suited for separate cloning if individual cells or cell groups on a nutrient solution. A specific cell or cell group is separated from the other cells in the nutrient solution by simply placing the cloning ring over it. The rings are made of high-grade borosilicate glass, and can be thermally sterilized without problems. The ring faces are ground perfectly flat, enabling the rings to be fixed e.g. to the floor of a Petri dish by means of a suitable grease. Subsequently, the nutrient solution is filled into the ring. The grease provides a seal between the ring and the Petri dish, whereby the precision-ground flat end ensures that very little grease is required to provide an optimum seal. The same applies in the case of Petri dishes prepared with a nutrient solution – here, the seal is provided simply by pressing the ring into the solution and down to the floor of the dish. Cloning cylinders

Twisted glass tubes and capillaries are produced simply by heating and twisting. By this means, the tubes obtain a large internal surface in relation to their length, enabling them to be used e.g. as cooling sections. Another application area is for ornamental and design articles.

If required, we can supply capillaries and tubes with predetermined break points. For this purpose, the component is notched at the required breaking location. If the component is then subjected to a bending force, it will break at the notched point. To prevent unintended breakage, we recommend using medium or thick-walled tubes and capillaries.

These short molded components are fused to measurement electrodes and serve as filling/draining ports for the electrodes. The beaded edge is ideal for connecting rubber or plastic hoses. The ports are usually made of lead, borosilicate, and soda glass.

Boiling rods Boiling rods are ideally suited to prevent superheating during boiling or distillation in glass beakers or Erlenmeyer flasks. They are made of high-grade soda glass, are reusable, and excellently suited for many applications. Stirring rods Used for mixing and homogenizing mixtures of chemicals and samples. They are also ideal for stirring hot or boiling substances. They are made of high-grade soda glass, are reusable, and excellently suited for many applications. For special applications, they are also available in borosilicate or quartz glass.

We provide special rods and fibers, on whose tip a drop of the sample can be filled conveniently into a test tube. Fibers with a diameter of less than 0,1 mm can be inserted even into the smallest test tubes. These rods and fibers are mainly made of borosilicate glass 3.3. We can also supply rods and fibers that are made of the same type of glass as your test tubes.

Dropper pipettes are characterized by very short tips and relatively large volumes. A rubber or silicone teat (see Accessories) at the upper end of the pipette enables the drops formed at the tip to be dispensed easily and conveniently. The pipette tip can be suitably shaped to create the required drop sizes. The same applies for the rim, which can be smooth or slightly flanged to ensure a secure hold of the teat or tubing system. Our dropper pipettes come in various sizes and versions.