Alchem Process Ltd
Unit 4 Church Road Ind Estate,
Gorslas, Llanelli, Carmarthenshire,
SA14 7NN.
Tel: 00 44 (0) 1269 841 324

DIN 11864 & DIN 11853 Aseptic Unions

DIN 11864-3 & DIN 11853-3 Aseptic Unions

This range of aseptic fittings has been developed by the German hygienic industry to meet the exacting needs of the pharmaceutical, food and fine chemical industries. 

Three designs of pipe fittings have been tailored to accept 2 different types of aseptic seals that effect a smooth interface within the pipe work whilst simultaneously achieving a metal to metal seat behind the joint.

The seal sections used are referenced as “Form A” and “Form B” and both have distinctive profiles that are easily recognised.  Form A is an O Ring Joint whilst Form B is a 2-part Square section seal with a secondary internal diamond section.


The Type 3 design is based on the 3A Clamp union and uses the flange diameters common to the Metric DIN 32676 Standard.   


Available with optional lengths to suit Orbital and Manual Welding, these unions have been designed to match tube and pipe specifications including DIN 11850 / 11866; ISO 2037; ASME BPE 2002 and BS 4825 Part 1 and also the ISO 1127 Standard for schedule pipe.


Materials: 316L SS


Related standards:

DIN 11864-1 Form A – Aseptic Screwed Union

DIN 11864-2 Form A - Aseptic Flange Union

DIN 11864-3 Form A - Aseptic Clamp Union

DIN 11866 / 11850 / 11865

ISO 1127

ISO 2037 / BS 4825 / ASME BPE 2014

DIN 11853 (Type 1 only)