The surface of the ALMATEC diaphragms is smooth and not interrupted by any seals whatsover. Due to the integrated metal core, they do not require diaphragm discs that can frequently gives rise to leaks and attract dirt. The diaphragms are produced in priming position; this simplifies assembly and almost completely eliminates the dead space on the air side, since the inner side of the diaphragms rests against the central housing in the limit position, thus optimizing efficiency and reducing air consumption.

Since the medium is displaced and delivered by the compressed air, the diaphragms merely serve as barriers and are not pressurized. This is a fact of decisive importance for the service life of the diaphragms.

ALMATEC diaphragms have always been designed from the "PTFE" point of view. This results in a diaphragm that has a large diameter and short stroke with low flexural load. This ensures uniform delivery regardless of the material used for the diaphragm's construction.

ALMATEC diaphragms can be made of either EPDM, PTFE/EPDM-composite or NBR.

Pumps of the FUTUR series are equipped with a special developed diaphragm constructed only of PTFE.