May conversion factors be included in the EPD?

Yes, conversion factors may be included for the purposes of: 

1. converting the declared results of a product group to results for specific products within the group, or
2. converting the declared results to results for another declared/functional unit.

For conversion factors to be possible, the results of all declared life-cycle stages/modules must scale linearly with the conversion factor. 

The conversion factors must be verifiable, i.e., the underlying data for the conversion factors must be provided in the LCA report. 

The conversion factors shall be included in the section Additional environmental information, although they may be referred to in the Results section.

Conversion factors can, however, not be included for the purpose of converting the declared results into results for products not covered by the EPD. The EPD is for a specific product or product group, and only the EPD content of that product/product group has been verified and may be considered EPD information.