Full Materials Disclosures: Mass Percentage

Product/Sub-Product Weight

When generating a Full Materials Disclosure (FMD) using the Assent Materials Declarations Tool (AMDT), users must add the weight of the product in the PRODUCT DETAILS section. This is where users can describe a Product and all Sub-Products that make up the Product. A Sub-Product comprises any parts or sub-assemblies within the declared Product that can nest within each other infinitely.

In the PRODUCT DETAILS section, it is important to note that the weight of the Product or Sub-Product cannot be in Mass Percentage; users must select mg, g, or kg as the unit of measure.

The Mass Percentage can be declared in the HOMOGENEOUS MATERIALS - CLASS D section.


Consistency in Product and Sub-Product mass measurement is important for roll-up calculations tied to the Product roll-up tolerance and proprietary substance limit set in the Assent Compliance Manager (ACM).

Understanding Mass Percentage

For users to understand how Mass Percentage works, it is important to pay attention to the relationship between Substance weight, Homogeneous Material weight and Product weight. The total weight of the Substances should always equal the weight of the Homogeneous Material, and the total weight of the Homogeneous Materials should equal the weight of the Product or the Sub-Product it is nested under.

For example:


In the above image, the Product (Example Product) weight is 200 g and the Product has 2 Homogeneous Materials: Example H1 and Example H2.

Example H1 has a weight of 50 g, which equals 25% of the Example Product’s weight. The Substances nested under the Homogeneous Material Example H1 should therefore add up to 25% when the UoM Mass Percentage is used. In the example, we have 10, 4 and 11, which add up to 25 Mass Percent.

Example H2 has a weight of 150 g, which equals 75% of the Example Product’s weight. The weight of the Substances nested under it should equal 75 Mass Percent. In the example, we have 67 and 8, which add up to 75 Mass Percent.

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