Ceramic in Fallout 76 is a key item in the creation of MANY different camp items, especially when it comes to things such as your defense structures and anything that requires power.
That being said, there is a LOT of different items in Fallout 76 that contain ceramic, meaning that you shouldn’t (hopefully) ever run dry on that supply. The items that specifically contain Ceramic when you break them down are:
Ashtrays
Black Bowls (not plastic)
Garden Gnomes
Ceramic Bowls
Chinese Ornamental Vase
Most Bowls that just aren’t plastic
Coffee Cups
Plates (Once again, specific Ceramic plates)
Vases
Teacups
Umbrella’s
Of course, there is a VARIETY of some of those objects, such as the bowls, plates, sauces, cups, gnomes, etc. Those can come in many different forms and colors, but will always contain the same components when broken done.
That being said, there are several locations where these items can be EASILY farmed, making you a ton of Ceramic scrap, enough that you won’t ever really have to care about spending too much of it.