Glass Flasks & Accessories

Flasks in single neck or multiple neck design with conical ground joint socket and spherical ground joint cup are a substantial part of small or big apparatus. The most common forms and designs of our standard delivery range with nominal sizes from 5 ml up to 10,000 ml. All ground joints are also available in other standard sizes, e.g. US-standard

round bottom flask
Round Bottom Flasks
Flasks, round bottom, with NS socket Round bottom flasks with neck can be universally employed and they are manufactured according to DIN 12 348 as far as they are part of this standard. All standard ground necks in sizes NS 10 and NS 14 are equipped with metal hooks.

For Round Bottom Flasks

 

round bottom flask
Pear Shape & Kjeldahl Flask
Pear shaped flasks are employed in distillations when low volumes are used. All standard ground necks are equipped with metal hooks. Flasks, Kjeldahl, with NS socket

For Pear Shaped & Kjeldahl Flasks

 

flat bottom flaskRotary Evaporation Flasks, Flat Bottom Flasks & Receivers
Flasks, rotary evaporation, with NS socket The bottom is slightly curved inside. Receiver flasks, with NS socket They are preferably used as receiving vessels in distillation apparatus. The flasks are equipped with metal hooks.

For Rotary Evaporation Flasks, Flat Bottom Flasks & Receivers



flat bottom flask
Erlenmeyer Flasks & Round Bottom_Flask with Ground Joint

Flasks, Erlenmeyer, with NS socket The bottom is flat or slightly curved inside (see also page 5.4). They are manufactured according to DIN 12 387.Flasks, round bottom, with spherical ground joint cup (inch standard) The spherical ground joint cups are manufactured according to DIN 12 244.

For Rotary Evaporation Flasks, Flat Bottom Flasks & Receivers

 

flat bottom flaskNitrogen Flasks
Flasks, round bottom, with single way stopcock The conical ground joint sockets are manufactured according to DIN 12 245. These flasks are suitable for applications of safety gas techniques. They are recommended for working with oxygen sensitive or moisture sensitive substances.

For Nitrogen Flasks

 

flat bottom flask
Stopcock Flasks & 3 Neck Flasks

Flasks, round bottom, with tail stopcock Flasks, reaction, with three necks 7° angled They are manufactured according to DIN 12 392. Compensating bends 7° angled

For Stopcock Flask & 3 Neck Flask

 

3 neck flask3 & 4 Neck Flasks
Flasks, reaction, with three and four necks They are manufactured according to DIN 12 392 as far as they are part of this standard


For 3 & 4 Neck Flask

 

four neck flask2 Neck Flasks
Distilling Flasks, with two necks necks. They are manufactured according to DIN 12 394 as far as they are part of this standard. All centre necks with socket NS 14/23 are equipped with metal hooks.

For 2 Neck Distilling Flasks

 

distilling flask3 Neck Flasks
Distilling Flasks, with three necks. They are manufactured according to DIN 12 394 as far as they are part of this standard. All centre necks with socket NS 14/23 are equipped with metal hooks.

For 3 Neck Distilling Flasks

 

distilling flask2 Neck Flasks & Reaction Flasks
Flasks, distilling, pear shaped, with two necks All centre necks with socket NS 14/23 are equipped with metal hooks. Reaction flask, with three necks and tempering jacket. Available with or without temperable ground joints. The centre necks in design A with socket NS 14/23 are equipped with metal hooks.

For 2 Neck Distilling Pear Shape Flasks & Reaction Vessels

Glass Connecting Pieces & Accessories

Conical ground joints are mostly used for laboratory glassware. They are suitable for use under vacuum or slight overpressure, in many cases even without clamps.

ground jointsGround Joint Connecting Pieces Cone and socket are made of Borosilicate glass 3.3 Our conical joints are manufactured to an accuracy of only 1/10 of the admitted taper angle deviation.

For Connecting Pieces with Ground Joints


safety hook
Safety Hooks and Clamps
Metal safety hooks are favourable used to secure pump stopcocks and conical ground joint connections on flasks. The necessary rubber stopcock securing and springs are described.


For Connecting Joint Accessories

 

springSprings & Sleeves These stainless steel made springs, bore of the spring line 5 mm, are suitable for securing conical ground joints in general. Sleeves with groove and made of PTFE can be used instead of lubricating grease when slight or medium vacuum is required.

For Springs & Sleeves



spherical jointsSpherical Ground Joints Cups and balls are made of Borosilicate glass 3.3 corresponding to DIN 12 244 part 1 and due to their high grinding quality interchangeable. Used with lubricating grease spherical joints provide a high tightness meeting the highest requirements.

For Spherical Ground Joints

 

 

spherical sleeveSpherical Joint Sleeves & Clips
Sleeves with groove and made of PTFE can be used instead of lubricating grease when slight or medium vacuum is required. These joint clips can be used for securing spherical ground joints and for setting of wanted operation angles.
For Spherical Joint Sleeves & Clips

 

 

rotulex systemRotulex System
The Rotulex system offers an alternative for a grease-free connection of spherical ground joints and meeting the high requirements for tightness under vacuum andslight overpressure. The fire-polished cup corresponds in its sizes to DIN 12 244 part 1. The fire polished counterpart in ball shape has a groove to take a sealing.

For Rotulex System Components

 

rotulex systemRotulex System
The Rotulex system offers an alternative for a grease-free connection of spherical ground joints and meeting the high requirements for tightness under vacuum andslight overpressure. The fire-polished cup corresponds in its sizes to DIN 12 244 part 1. The fire polished counterpart in ball shape has a groove to take a sealing.

For Rotulex System Clamps

 

vacuum flat flangeVacuum Flat Flanges. Boro-silicate & Quartz Glass
We recommend this connecting system for greaseless connection of glass and peripherals with metallic connector e.g. pumps. Due to its shape, the tube ends are very stable and they are able to bear relatively high tightening. Used together with Orings they have a very low leakage rate.

For Vacuum Flat Flanges, Seals and Clamps

 

GL TheadsThreaded Glass Connectors
Screw thread connections offer some advantages, especially for connecting PTFE hoses or impulse generators. GL-threads with narrow tube according to DIN 12 216 are the most employed connection.

For GL Threaded Connectors

 

threaded connectorsThreaded Adapters & Seals
Seals are made of silicone caoutchouc with or without bore and suitable for the caps described above. Available in two different types. Type A with vulcanised-on PTFE washers and type B PTFE protected. Screw thread adapter They allow a flexible connection of glass screw threads.

For Threaded adapters and Seals

 

metric threaded adaptersMetric Threaded & GL Adapters
For connecting GL screw threads and conical ground joints. Screws are often used to adapt glass and metal. To connect these two materials without an adapter connectors with a metric thread are suitable

For Metric & GL Threaded Adapters



QVF Safety ConnectorsQVF Safety Adapters & Seals
This safety flat flange meets the highest requirements for glass connection and is especially suitable for direct connection to other pipe materials. We recommend the use as inlet or outlet connecting nipple at temperature jackets

reaction flask For QVF Safety Connectors & Seals



Flange ConnectorsFlange Connectors This connection consists of flange rings, made of glass fibre reinforced thermosetting plastic, supports made of Polyamide and screws, washer, pressure springs and nuts, made of stainless steel.


reaction Vessels For Flange Connectors

 

 

Schott ConnectorsSchott Connectors
The flange system of the Tech flange system "Schott" is a widespreadly used system for components in units. Besides the safety flat flange system QVF, the "Schott" system is an alternative connecting system.
For Schott Connectors

 

 

plastic connectorsPlastic Connectors
This connection support made of thermosetting plastic is corrosion resistant and of low weight. Additional measures for conduction of electrostatic charges are not necessary. Delivery consists of flange rings, interfacing, screws, washer and nuts.
For Plastic Flange Connectors

 

 

Glass Stopcocks & Valves

Made of Borosilicate glass 3.3, distinguish by the high precession of manufacture and the top surface quality. Barrel and hollow glass key of the stopcock are interchangeable. The keeping of the sharp tolerance limits regarding to the angles, mantle line and diameter of the cone leads to a large touching area from barrel and cone. The result is a high vacuum tightness with minimal surface pressure. Some types of stopcocks are delivered with PTFE or full glass key. Full glass keys are recommended for use at high temperatures. A retaining device at the key prevents inadvertent removal and gives additional safety for operations under slight overpressure. In this point, the stopcocks fully meet the requirements of DIN 12 540, part 1. Besides stopcocks, valves are the most employed locking devices in laboratory technique. Because of their various use, they have to fulfil many jobs. These jobs reach from simple locking of a liquid at normal pressure to use at high vacuum. This variety of applications has not only led to a wide range of designs, but also to spindle valves with higher or lower quality standard with the same cost/performance ratio. So the user can choose lower price locking devices for simple purposes. All designs and types have an utmost universal corrosion resistance, because the media can only get in touch with Borosilicate glass 3.3 (valve body) and PTFE (spindle).

one way stopcocks
Single Way Stopcock Available with different arms, bending tubes, capilliary, enlarged arm and gas sampling tube.


For Single Way Stopcocks


two way stopcocks
Two Way Stopcock According to DIN 12 553, the keys of the stopcocks are fitted with two parallel bores. Delivered with hollow glass plug and either with plain arms or capillary arms.


For Two Way Stopcocks


three way stopcocks
Three Way Stopcock Available with different arms, bending tubes, capilliary, & enlarged arm


For Three Way Stopcocks


tail stopcocks
Tail Stopcock These three way conical stopcocks according to DIN 12 555 with axial bottom outlet at the key are used for introduction of nitrogen. Normally, they are delivered with hollow glass key, but with choice of two bending arms or one bending arm and one enlarged arm.

For Tail Stopcocks


czako stopcocks
Czako Stopcock Three way conical stopcocks with an 120° angle bore in the hollow glass key according to DIN 12 563.


For Czako Stopcocks


high vacuum stopcocks
High Vacuum Stopcocks These stopcocks are a special design of the pump stopcocks described before.High vacuum stopcocks, safety pattern are used in vacuum apparatus and serve as locking device.Due to the closed lower part (chamber), a higher tightness is reached compared with pump stopcocks.

For High Vacuum Stopcocks


spindle valve
Straight Valves O-rings, fitted in the valve stamp and with adjustable pressing power, guarantee an excellent sealing between spindle and body.This and the metal cone in the spindle ensure a perfect guiding of the valve insert.

For Straight Valves


right angle valve
Right Angle Glass Valves O-rings, fitted in the valve stamp and with adjustable pressing power, guarantee an excellent sealing between spindle and body.This and the metal cone in the spindle ensure a perfect guiding of the valve insert.

For Right Angle Valves


three way valve
Three Way & High Pressure Glass Valves This valve is ideal for higher operation pressures. The glass part has been designed for pressures up to 10 bar


For Three Way & High Pressure Valves


bottom drain valve
Bottom Drain Valves These valves have an additional adjustable loaded spring in the upper part besides the work-holding device. The plunger is also pressed in its seat by the loaded spring, when the plunger is contracting during the cooling process

For Bottom Drain Valves


spindle valve
Spindle Valves All-round valves are suitable for universal use in laboratory devices, when only low requirements for vacuum tightness are needed

For Spindle Valves

 


glass needle valve
Glass Needle Valves The high precision guarantees the interchangeability of the glass body and the upper part of the valve. An additional sealing between these two components allows the use of that valve for laboratory devices operating under vacuum.

For Glass Needle Valves


three way and right angle valve
Three Way and Right Angle Valves Three way and right angle glass valves

For Three Way and Right Angle Valves