Kiln furniture usually refers to different posts and shelves that are used to support glass during the glass fusing process.
The furniture is generally made from compressed clay called mullite. Being very durable and strong, mullite is able to resist kiln temperatures and can be used repeatedly.
It is used for shelves, posts and dams.
shelves are generally flat and made to fit inside the kiln with a gap
between the shelf and the kiln sides. Shelves usually sit on posts or
blocks on the kiln floor. Like most kiln ware, shelves will vary in size and weight.