Lesson 3: Increased Material and Substance Data Transparency and Quality

Material and Substance Data Transparency & Quality

Introduction of the New Material Element

  • HPD v2.3 introduces the new material data element and adds context alongside the substance data element.
  • Previously, HPDC focus on inventory and hazards of chemicals (i.e., substances) in products.
  • Two types of content may be listed on an HPD:
  1. A substance – a chemical or basic building block of content.
  2. A material – a uniform solid, liquid, or gas composed of one or more substances and/or materials.
  • A material different from a substance in that it may either appear as a basic building block, or a mixture of substances and/or material in a Nested Inventory.
  • The new material element gives HPDC’s Special Conditions more structured and verifiable data which will be covered in Section 4 of this training.

Updated Guidance for Substance Names.

  • Substance names can become complicated and confused quickly due to the complexity of the chemical formulas, so manufacturers simplify the name.
  • It was discovered that many times the substance names were oversimplified, which then does not provide the chemical transparency needed for an HPD.
  • In the HPD Open Standard v2.3, manufacturers are given discretion in choosing the most useful name and are encouraged to add in synonyms of the substance.


  • “Flame Retardant” is too general, as it only describes a role.
  • “(Bromomethyl)[1-(naphthalen-1-yl)cyclohexa-2,4-dien-1-yl]-lambda~2~-germane” is too technical for most HPD users.
  • “Brominated Flame Retardant” describes the product yet allows a user to understand its role in the product.

Residuals and Impurities Display

  • The term “Completed” (previously “Considered”) is now displayed to indicate whether the manufacturer has completed the Residuals & Impurities evaluation for an HPD.
  • Previously, the “X of Y” reporting concept was being used in the HPD Builder to express whether the consideration within each Material is thought to be complete, where the original intent was to report how many materials within the product were considered.

Removal of “Undisclosed” Percentage Weight

  • The HPD Open Standard offers manufacturers several ways to keep their formulas and ingredients proprietary, to their desired degree. The standard includes a procedure for keeping the name of an ingredient proprietary, and small ranges in the percentage weight of an ingredient is allowed for the same purpose.
  • Another option specified in the HPD Open Standard had been to report “Undisclosed” for percentage weight. However, the use of this option was not in demand by manufacturers, so it has been removed in HPD v2.3.

Multiple Products with Content Differences Greater than 10%

  • Normally multiple products can be listed on one HPD when they have identical content, or the content differences between the products or product types account for 10% or less of the total mass of each product.
  • HPD v2.3 recognizes practical situations in building product manufacturing when that upper limit of 10% may be exceeded, with a valid explanation noted.


  1. A concrete block manufacturer has 25 different mix designs across several plants. All the mixes are sold as identical products, with all meeting the same ASTM specifications, the same color, and the same function. The ingredients are functionally similar but may vary significantly due to regional differences, (e.g., the aggregate from two different sources vary significantly in its absorption properties and calls for significant variations in other ingredients). Twenty-five different HPDs would be confusing for HPD users who may not be able to distinguish which one applies to the product they have specified.
  2. A joint compound manufacturer with 12 plants formulates its product with as much as 30% variation in the water content based on the humidity of the region, the climate, and the altitude. There is no difference in the labeling or marketing of the product, and geographical distribution boundaries of formulations may also vary.

Alternate Materials and Substances

  • Previously in HPD v2.2, it was common for substances or materials marked as “Alternate” to be listed with large percentage weight ranges, which caused confusion because there is an assumption that an alternate ingredient would have the same percentage weight as its primary ingredient, but the formulations may be more complex.
  • In v2.3, the actual percentage weight must be listed for the “Alternates.” An annotation “ALT” or “ALTERNATE” is added to the %weight field. Listing rules in v2.2 will continue into v2.3 where an “Alternate” will not appear in the Summary of Contents or other HPD summary sections.