... that to participate in the balloting process for TAPPI Standards you must sign up for the Standard-Specific Interest Groups (SSIGs)? Drafts are available for anyone  to review, but to vote and comment you must be a member of the SSIG.

Each Standard has its own SSIG – so you have to sign up for each Standard that you have an interest in. Send an e-mail to standards@tappi.org for more information and to set up your SSIG profile.