In Section 3 of the HPD, manufacturers may list certifications relevant to the product being reported. VOC and emissions certifications are among the most common types listed.
The HPD Open Standard does not have specific requirements related to the expiry date of these certificates. This is intentional. The HPD is a self-declaration, and manufacturers are the best judges of what certificates to list in this section. There are a variety of legitimate reasons that an expired certificate may be listed.
For example, some emissions certificates must be renewed annually, while the HPD is good for three years. It is not the intention of the HPD Open Standard that the manufacturer must update their HPD every year simply to refresh the expiry date on a certificate that is not otherwise changing.
The key requirement that must be followed is that certifications must be applicable to the product reported on the HPD.
Manufacturers are strongly encouraged to use the "Certification and Compliance Notes" section to explain the applicability and relevance of any certificates that might raise questions for HPD users. This would include expired or soon-to-be-expired certificates.
A related issue that should not be overlooked is a certificate for a different, but related, product. If, for example, an EPD has been issued that applies to a different-but-related product, or to a generic product category, the manufacturer may list that EPD on the HPD if they believe it provides useful information for the HPD user. They should, however, provide an explanation to support its relevance to the product reported on the HPD.