DNV

The requirement to document PFOS-free fire-extinguishing foams applies to all types of foam on board, i.e. both fixed systems and portable equipment.

Briefly summarized, there are three ways to document PFOSfree foam:

1. A PFOS-free declaration is provided by the manufacturer of the foam.
2. The foam can be sampled and tested according to a recognized standard by an accredited laboratory and concluded to be PFOS-free through a laboratory test report confirming that the PFOS concentration in the foam is below 10 mg/kg (0.001% by weight).
3. Although not required, the type approval (TA) or Marine Equipment Directive (MED) certificate for the foam may state that it is PFOS-free. If this is the case, it is considered equivalent to a PFOS-free declaration.

https://www.dnv.com/news/2026/how-to-document-pfos-free-fire-extinguishing-foam-on-board/