Diehm offers plain and jacketed glass reaction systems with capacities from 250 ml up to 50 litres with up to DN400 technical Flanges. Plain and jacketed vessels in either flat or round bottom designs are offered with a comprehensive range of accessories.

Reactors are supplied with graduations as standard and zero dead space bottom outlet valves can be specified from a number of different designs and materials. Bottom valves are available for pneumatic operation and with integral Pt100 if required.

Diehm provides a wide range of accessories in glass, stainless steel, PTFE and other materials and, in addition to standard products, Diehm welcomes enquiries for bespoke manufacturing to customer designs and specifications. Diehm provides complete systems including automation, temperature control, stirring and vacuum using many leading brands.

Technical Features

Complete system with Best Features Products


Wide range of vessels Laboratory

250 ml to 5 L Kilo Laboratory / Pilot Plant : 10 L to 100 L


Reactor / Jacket Ratio - 1:0.3

This ratio enables efficient Heating-Cooling


Wide Temperature Range

-40°C to +200°C | -100°C to +200°C
-40°C to +300°C | -100°C to +260°C


Pressure range

-1 bar to 0.5 bar


Zero holdup bottom valve

Avoids material loses and allows easy cleaning. MOC depends on process requirement


L/D ratio

All reactors have an optimum L/D ratio which enable thorough mixing of the product. Customization can be offered

Maximum chemical resistance

All wetted parts are glass, PTFE, PEEK, PFA or FFKM

Easy vessel lid

Easy vessel changes

Reactor vessels can be easily interchanged under the same lid.


customize to your exact requirements

Diehm reactors are easy to customize to your exact requirements; simply choose from a range of vessels sizes and types, baffles, temperature sensors, stirrers, stirrer motors, and other glassware accessories.

Jacketed Reactors

Choose from a wide range of high quality glass jacketed and vacuum jacketed reaction vessels.


0.25L, 0.5L, 1L, 2L, 3L, 5L, 10L, 15L, 20L, 30L, 50L, 100 Lt


Vacuum Jacketed

0.25L, 0.5L, 1L, 2L, 3L, 5L, 10L, 15L, 20L, 30L, 50L


Custom Reactors

Also available


A wide range of stirrers are available in different material such as stainless steel coated with PFA/ PTFE, stainless steel and borosilicate glass.



Pitched Blade



Custom Stirrers


Lids are available in borosilicate glass in sizes DN100, DN120, DN150, DN200, DN300 and DN400. Number of ports on the lid can be customized.

Stirrer Motors

Powerful CAT Scientific or Heidolph stirrer motors with digital indication of rpm and torque are available. Atex and Pneumatic stirrer motors can be offered on request.

Temperature Sensors

Temperature sensors offered provide minimum sensing volume for the selected vessel. Flameproof temperature sensors can be offered on request.

Distillation Sets

Accessories such as liquid divider / reflux divider, dean stark phase separator and vacuum manifold can be offered.


Glass or stainless steel baffles can be offered on request.

Secondary Bottom Valve

Can be offered on request.
Product Range
Standard glass reactor units250ml to 100 Lt
Glass reactor units with distillation setup500ml to 100 Lt
Solvent recovery systems with hollow column. (Option of structured and unstructured packing)5L to 50L
Fractional distillation set up with jacketed RB flask, loaded with packed column500 ml to 5 L
Fractional distillation set up with jacketed Reactor, loaded with packed column1 to 20 Lt
Glass filter reactors250 ml to 50 L
Glass scrubber1 L to 20 L