Which of the following is NOT something you need to know in order to determine if you need to use placards?

You do not need to know when a product is manufactured or expires unless your company has an additional responsibility. When it comes to hazardous materials, you do need to know the amount of the hazardous material being shipped, its hazard class, and what will be the total amount of all hazardous materials of all classes on your commercial vehicle during your trip.