In order to start gathering data for your HPD you need to select the scope for reporting your product’s contents. This scope is set by two parameters:
The Health Product Declaration (HPD) offers two overall ways to organize and display the content inventory: Basic and Nested. Both are LEED-compliant. The Nested inventory is preferred by HPD users because it provides more granular data on a product.
In addition, manufacturers must choose on their HPDs to establish thresholds at a Material or at a Product level. For more information check our article: Which content inventory method is better, Basic or Nested?)
Thresholds — such as 100 ppm or 1,000 ppm— establish reporting requirements for substances on the HPD. If a 1,000 ppm threshold is selected, you must disclose all ingredients above that concentration.
Choosing a material-level threshold means that the manufacturer must disclose all ingredients above that concentration in each material within the overall product. Choosing a product-level threshold means that the manufacturer must disclose all ingredients above that concentration in the entire product.
This means there are three possible approaches for creating an HPD, each of which provides a different level of detail in its information. They are listed here, from most to least detailed: