Question

Which of the following materials presents in clay which imparts plasticity in it?

(a) Silica

(b) Phyllosilicates

(c) Calcium

(d) Sodium

I had been asked this question in an online quiz.

I'd like to ask this question from Fire Clays, Illite and Kaolinite in section Molding and Core Sands of Casting-Forming-Welding I

Answer 1

The correct option is (b) Phyllosilicates

For explanation I would say: Clay generally contains phyllosilicates which are mainly responsible for imparting plasticity in the clay material. It can also include other materials which impart plasticity and harden-ability when the clay is dried or fired. Combined phases in clay material can also contain materials that do not impart any plasticity.