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    Test method

    EN ISO 11058 - Geotextiles - water permeability characteristics normal to the plane, without load

    Testing · NAC-037-TL
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    In short

    EN ISO 11058 - Geotextiles - water permeability characteristics normal to the plane, without load. Amstelfy's laboratory determines permeability normal to plane of geotextiles, geogrids and geocomposites according to EN ISO 11058 under its ISO/IEC 17025 accreditation (NAC-037-TL). The method is typically part of initial type testing, ETA test programmes or factory production control verification; results are reported in English for manufacturers across Europe.

    What we assess

    • permeability normal to plane

    Products covered

    • geotextiles
    • geogrids
    • geocomposites

    Accreditation status

    ActivityStandardAccreditationValidityOn scope
    TestingISO/IEC 17025:2017NAC-037-TLvalid until 2 December 2028Yes
    Product certificationISO/IEC 17065:2012NAC-026-PPSvalid until 31 January 2030No
    Validation & verificationISO/IEC 17029:2019NAC-006-VVvalid until 31 January 2030No
    NAC-037-TL — View certificate (PDF)NAC-026-PPS — View certificate (PDF)NAC-006-VV — View certificate (PDF)

    Route to market

    This test method is used inside initial type testing, ETA assessment programmes and factory production control verification. Amstelfy reports it as an accredited test under NAC-037-TL, either stand-alone or as part of a complete test programme.

    How it works

    1. 1

      Send the standard number, product description and intended use

    2. 2

      We confirm the applicable test series, sample quantities and timeline

    3. 3

      Samples are delivered to Veilmeesterweg 20, 1187 ZW Amstelveen (Mon-Fri 09:00-17:00)

    4. 4

      You receive the report in English, written for the TAB, Notified Body, evaluation service or programme operator.

    Frequently asked questions

    Yes - it is listed on the ISO/IEC 17025 testing scope NAC-037-TL.

    geotextiles, geogrids and geocomposites.

    Yes. Samples are shipped to the laboratory in Amstelveen, 10 minutes from Schiphol; quotations, test plans and reports are in English, and correspondence is also possible in Dutch and Turkish.

    Related standards

    All Geotextiles & geosynthetics testing