This is the list of current procurement tender(s) open for proposals in the Preparatory Commission for the CTBTO. Please visit this site from time to time for information on new procurement tenders.

RFP/RFQ No.RFP No. 2018-0118/APYLOV
Date posted20 July 2018

ONE SEALED ENVELOPE - Replacement of Towers and Upgrade of Mesh Grounding System at IS36, Chatham Island, New Zealand

Request for Proposal

Closing date08 August 2018
RFP/RFQ No.RFP No. 2018-0068/APYLOV - RE-BID
Date posted18 July 2018

ONE SEALED ENVELOPE - Establishment of Infrastructure and Provision of Services for RN55, Kayerkan, Russia

Request for Proposal

Closing date23 July 2018
RFP/RFQ No.RFP No. 2018-0115/APYLOV
Date posted18 July 2018

ONE SEALED ENVELOPE - Provision of Support Services for IMS Radionuclide Stations Equipped with ARIX Noble Gas System, on a Call-off Basis

Request for Proposal

Closing date03 September 2018
RFP/RFQ No.RFP No. 2018-0111/MAHLEN
Date posted17 July 2018

TWO SEALED ENVELOPES - Site Preparation, Construction, Installation Support and Initial Testing at IS01, Pilcaniyeu, Argentina

Request for Proposal

Closing date24 August 2018
Date posted28 June 2018

Construction of a Sampler for Subsurface Gases

Request for Quotation

Clarifications #1

Closing date27 July 2018
RFP/RFQ No.RFP No. 2018-0092/JIBRIL
Date posted20 June 2018

2 SEALED ENVELOPES - Provision of SAP Services

Request for Proposal

Clarifications #1

Closing date17 August 2018
RFP/RFQ No.ITB No. 2018-0083/RAHMAN
Date posted12 June 2018

2 SEALED ENVELOPES - Renewal of the Existing Subscription Licenses for Alfresco DMS Edition for 2019

Invitation to Bid

Clarifications #1 - AMENDMENT

Extension to Deadline

Closing date03 August 2018

Additional information

If you are not yet registered with our organization, kindly fill in our Vendor Profile Form (Word Document) and return it either electronically to or via post to Chief, Procurement Section,  CTBTO, Vienna International Centre Wagramerstrasse 5, P.O. Box 1200, A-1400 Vienna, Austria. 

General Conditions of Contract (PDF)

General Conditions of Goods (PDF)

Please note that only requests from registered companies or organizations from CTBTO Member States (Word Document) will be considered.

In addition, if you wish to be included in the CTBTO mailing list, please contact the Procurement Section of CTBTO at You will then be informed of new tenders via Email as soon as they are issued.

Use of former Preparatory Commission for the CTBTO (“Commission”) employees in the preparation of Proposals:

A Bidder must not, in the absence of prior written approval from the Commission, permit a person to contribute to, or participate in, any process relating to the preparation of a Proposal or the procurement process, if the person:

a. at any time during the 12 months immediately preceding the date of issue of the Solicitation was an official, agent, servant or employee of, or otherwise engaged by the Commission;

b. at any time during the 24 months immediately preceding the date of issue of the Solicitation was an employee of the Commission personally engaged, directly or indirectly, in the definition of the requirements, project or activity to which the Solicitation relates.