cve...not sure what you are asking. If you are looking for fire resistance ratings of plywood, it is a combustible material and does not achieve a fire resistance rating without specific fire-retardant treatment. If you are asking about "finish" plywood, it is not treated and is readily combustible. Usually only structural grades of plywood are treated for fire resistance.
If you are asking about "Finnish" plywood, I have no idea since I'm in the US and have no experience in Finland.
Please clarify your question a bit if my answers have not met your need. Perhaps others have more insight.