Glass coefficiency is basically compatibility. How can the glass cooperate with itself or other types of glass. AKA COE for Coefficient of Expansion.
Everything has a COE. Boro is 33, this is actually 3,300,000. What this really means is it has good thermal resistance. But below is a comparison
(≈3.3 × 10−6 K−1)
General thermal expansion coefficient
In the general case of a gas, liquid, or solid, the volumetric coefficient of thermal expansion is given by