1. The primary building blocks of refractory bodies are given the name
grains or aggregates; these components comprise raw materials larger
than about 200mm and constitute, by weight, about 70% of a refractory
product. Several carefully graded sizes of aggregates are used to construct a close-packed product texture.
2. Matrix or filler materials smaller than 150 mm are then used to pack
the spaces among the gapped aggregates.
3. The terms binder, bond,or cement are used to describe the structural
unit that eventually adheres the aggregates and/or matrix ingredients
together to form the refractory product’s strength.
4. There is always unfilled space remaining in the refractory body, and
these open volumes are called pores