HPD Open Standard version 2.1 provides for three content inventory methods:  Basic Inventory, Nested Material Inventory with Product Threshold, and Nested Material Inventory with Material Threshold. 


  • Basic Inventory is appropriate when the manufacturer wishes to report the contents of the product, only reflecting substances.  It can be used for more complex products (i.e., those with a material structure) as well as for products that are composed only of substance level ingredients. 
  • Nested Material Inventory with Product Threshold is appropriate when the manufacturer wishes to report the product contents within the material structure, but wishes to use a product-wide reporting threshold, instead of a material-specific reporting threshold.  With this inventory method, substances are required to be reported, within their respective material structure, if they fall at or above the product level reporting threshold.  The reporting threshold is the same for all materials within the product.
  • Nested Material Inventory with Material Threshold is appropriate when the manufacturer wishes to report the product contents within the material structure, and use a material-level threshold to determine which substances are required to be reported.  Material Thresholds may vary from material to material.  For example, one material may be specified at 100 PPM and another at 1000 PPM. 


For the purposes of determining compliance with LEED v4 Material Ingredient credit requirements, all three content inventory methods may be used, as long as the reporting threshold is consistent with the LEED requirements; for more information on LEED compliance please click here.