Construction products can comprise of either a single material, or multiple materials.
Where a product (with an EPD) is comprised of more than one material, the assessor should decide which material category classification should be used for classifying the EPD at their own discretion, and in accordance with the categories listed in the manual.
To do this, the assessor may base the EPD classification on the material that represents the majority of the product’s volume. For example, if a product comprises 0.8 m3 of metal and 0.6 m3 of glass, then the classification to use for the EPD is “Metal”.
Other reasonable approaches may be used. Whatever approach is used, it must be applied consistently across all EPD classifications.