Materials or substances may be considered within the HPD Open Standard to be “Special Conditions” for several reasons, among which are these examples:
- A content inventory cannot be created due to variable or unknown composition and lack of CAS Registry Numbers, or CASRNs. This can occur, for example, with some biological materials, geological materials, or mixed recycled content.
- A content inventory can be created, in theory, using regular HPD methods, but it is judged not practical or feasible to do so. For example, when electronics are a minor component of a building product, if the added value to building project decision-makers of having a regular inventory reported for the electronic component is seen to be low, using a Special Condition has been approved by the Technical Committee. This is a determination that is made by the HPDC Technical Committee, not a determination to be made by an individual preparer of an HPD.
HPD Open Standard v2.1.1 rigorously defines, using Emerging Best Practices guidance, when Special Conditions apply to selected materials and substances, and how manufacturers can characterize a Special Condition in a completed HPD. Importantly, HPDs developed using HPD-defined Special Conditions will be able to qualify for the key LEED v4 credit, “Building products disclosure and optimization: Material ingredients,” Option 1.
Specific modifications to the HPD Open Standard v2.1.1 include:
- Ability to characterize, screen, and/or identify a Special Condition according to emerging Best Practices guidance and receive a “Yes except Special Conditions” indicator.
- Specific instructions for data fields that define information to be provided and format for that information.
Detailed information on Special Conditions is available in HPDC’s Emerging Best Practices guidance.