Standardization of all geosynthetic products including geotextlles, geomembranes, geocomposite clay liners and other geosynthetic related products.

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published ISO standards *

under the direct responsibility of ISO/TC 221


ISO standards under development *

under the direct responsibility of ISO/TC 221


Participating members


Observing members

* number includes updates

Reference Title Type
ISO/TC 221/WG 2 Terminology, identification and sampling Working group
ISO/TC 221/WG 3 Mechanical properties Working group
ISO/TC 221/WG 4 Hydraulic properties Working group
ISO/TC 221/WG 5 Durability Working group
ISO/TC 221/WG 6 Design using geosynthetics Working group

Liaison Committees to ISO/TC 221

The committees below can access the documents of ISO/TC 221:

Reference Title ISO/IEC
ISO/TC 98 Bases for design of structures ISO


Organizations in liaison (Category A and B)

Acronym Title Category
EDANA International associations serving the nonwovens and related industries A
IGS IGS - International Geosynthetics Society A

Date Month Location TC/SC Note
21 October 2021 Virtual ISO/TC 221  

* Information definite but meeting not yet formally convened
** Provisional

ISO/TC 221 - Secretariat

BSI [United Kingdom]

British Standards Institution
389 Chiswick High Road
W4 4AL
United Kingdom

Tel: +44 208 996 90 00
Fax: +44 208 996 74 00