HPDs are valid for three years from the screening date. At any point before or after an HPD expires, manufacturers may update the HPD to the current version of the HPD Open Standard and re-publish the updated version. For this reason, it is critical that you update your content inventory and notify the manufacturer if your product’s formulation is modified.
While HPDs are self-reported disclosures, they may get third party verified through the HPDC Third Party Verification program. If the manufacturer has reported supplier’s data with proprietary ingredients, the third party verifier may contact you to confirm that the substance information reported in the HPD is correct. In these cases, you must be willing to disclose the chemical identity of the proprietary content to the verifier, which can be done under a non-disclosure agreement (NDA) for further protection.