Rubber extrusions of rubber extruder are continuous profiles, used often in sealing applications, such as doors and windows, weather strip, draught excluders. Or more robust applications, such as D-fenders on ships. Extrusions can range from simple geometric shapes, through to complex seal designs using dual materials. The name relates directly to the manufacturing method, and although this, of course, is not the only way of producing a length of rubber, it is the most effective way of creating consistent, continuous lengths of profiled rubber.

Rubber extrusions are produced using a die; a metal disk with a machined opening in the shape of the profile required. Behind the die sits the extruder, a rotating screw inside a heated cylinder, into which the raw compound, pigments, curing agents and other specialist ingredients are fed. The screw forces the uncured material out through the die cavity under considerable shear and heat. On exiting the die, the material must be cured; this can happen using a variety of processes including ovens, microwaves, and water, and is often part of a continuous process. The final production step will be finishing – adding coatings, cutting to lengths, and so forth.

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