DIN 11850 vs. DIN 11866

author: Sangyie Technology

2026-08-06

DIN 11850 is a specific tube standard for hygienic use in the food, dairy, and beverage industries.

DIN 11866 is is the overarching standard for aseptic systems that uses DIN 11850 as its "Series A" option.

DIN 11866 defines three different piping series to accommodate various global standards:

Series A (DIN 11850): This is the classic hygienic tube standard from Germany, using metric dimensions like DN 25 (OD 29x1.5 mm).
Series B (ISO 1127): This series uses the ISO standard for tube dimensions (e.g., OD 33.7x2.0 mm for DN 25).
Series C (ASME BPE): This series aligns with the American Society of Mechanical Engineers Bioprocessing Equipment standard, using imperial dimensions (e.g., OD 25.4 mm for 1" NPS)

Below are differences between Hygienic DIN standards and Aseptic DIN standards

Feature	Hygienic DIN Standards	Aseptic DIN Standards
Primary Focus	Cleanliness: Designed to prevent contamination and allow for thorough cleaning in food processing.	Sterility: Designed for processes that cannot tolerate any microbial life, requiring the elimination of all microorganisms.
Main Standard Series	EN 10357 / DIN 11850 - Hygienic tubes	DIN 11866 - Aseptic tubes
	DIN 11851 - Hygienic unions	DIN 11865 - Aseptic bends, tees and reducers
	DIN 11852 - Hygienic bends, tees, reducers and tubular fittings	DIN 11864 - Aseptic clamp, flange and threaded connections
	DIN 11853 - Hygienic clamp, flange and threaded connections
Design Philosophy	Allows for robust cleaning processes (CIP - Clean-in-Place) and minimizes areas where bacteria can grow.	More stringent design to eliminate any "dead space" where bacteria could survive. Specifically designed for steam sterilization (SIP - Sterilization-in-Place) and uses materials that can withstand this rigorous process.
Typical Industries	Food, dairy and beverage production	Pharmaceutical, biotechnology, and the production of vaccines, injectable drugs, and WFI (Water for Injection).

DIN 11850 is the older German standard for hygienic stainless steel tubes, which was replaced in 2014 by the European standard EN 10357 to create a single, unified standard across the EU

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