Contract number: ECHA/2019/355  FWC conditions of October 2018 
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electronic signature or through electronic data interchange.  
Reception of invoices by standard format (pdf) or email is not accepted. 
II.20. Price revision 
If a price revision index is provided in Article I.5.2, this Article applies to it.  
Prices are fixed and not subject to revision during the first year of the FWC. 
At the beginning of the second and every following year of the FWC, each price may be 
revised upwards or downwards at the request of one of the parties. 
A party may request a price revision in writing no later than three months before the 
anniversary date of entry into force of the FWC. The other party must acknowledge the 
request within 14 days of receipt.  
At the anniversary date, the contracting authority must communicate the final index for 
the month in which the request was received, or failing that, t he last provisional index 
available for that month . The contractor establishes the new price on this basis and 
communicates it as soon as possible to the contracting authority for verification.  
The contracting authority purchases on the basis of the prices in force at the date on which 
the specific contract enters into force.  
The price revision is calculated using the following formula: 
 Ir 
Pr = Po x ( — ) 
 Io 
where: Pr = revised price; 
 Po = price in the tender; 
 Io = index for the month in which the FWC enters into force; 
 Ir = index for the month in which the request to revise prices is received. 
II.21. Payments and guarantees 
II.21.1. Date of payment 
The date of payment is deemed to be the date on which the contracting authority's account 
is debited. 
II.21.2. Currency 
Payments are made in euros, unless another currency is provided for in Article I.7.  
II.21.3. Conversion 
The contracting authority make s any conversion between the euro and another currency 
at the daily euro exchange rate published in the Official Journal of the European Union, or 
failing that, at the monthly accounti ng exchange rate , as established by the European