Aptifirst can design and supply extrusion dies in a range of materials for rheological testing (rheometry), laboratory extrusion, and other applications. Please contact us with details of your requirements.

We can supply precision-machined extrusion dies with specific external geometry to suit your rheometer, in materials such as tool steel, stainless steel, tungsten carbide and many others.

As our animated* diagram above indicates, we can provide dies with different diameters, bore lengths, entrance angles and external geometries. We can supply you with certificates of metrication, and meet the exacting tolerances demanded by testing standards.

As well as parallel-bore dies, we can supply also dies with profile bores, such as the hyperbolic profiles in our diagrams, above, tapered or stepped bores, etc. We can add O-ring grooves to help seal against leakage if you wish. Hyperbolic dies are used in some studies of extensional flow.

Why not let us quote for your extrusion dies? We can supply dies for most capillary rheometers and extruders. Our prices are very competitive, and we are always willing to provide you with the dies that you want, rather than just offering sizes from a standard list. Send us a sketch or description of your design, either by email, fax or mail, and let us know in which material you would like it made.

We can also supply other accessories for capillary rheometers, such as cleaning mesh, pressure transducers, slit dies, backpressure dies for pressure coefficient of viscosity, die swell monitors, infra-red pyrometers for viscous heating, and others.

Two tungsten carbide rheometry dies
On the left is a conical die with a 3mm dia inlet and 4mm dia outlet. On the right is a 2mm dia x 30mm long parallel bore die with flat (90° ½-angle) entry

A parallel bore die in tungsten carbide,
bore diameter 1.500mm, length 30mm.

Parallel-bore die set for an Eta 2100 capillary extrusion rheometer, typically used for determining the Bagley End Correction.

A Bi-Hyperbolic profile die (two hyperbolic profiles back-to-back - see diagram on left) in stainless steel, fitted with a subminiature pressure transducer at the mid-point

Three tungsten carbide hyperbolic-profile dies for an ACER capillary extrusion rheometer.

Two hyperbolic-profile dies for a test rig

Examples of [top] a Garvey die for testing extrudability of rubber seals to ASTM D2230-96(2007), and [bottom] a die for extruding a slotted tubular profile, both made by precision EDM (Electrical Discharge Machining).