1. Porosity Measurement (Materials)
Course: CL-232
Porosity Measurement (Materials)
Faculty: Prof. Jayesh Bellare TA’s :Amit Patil Swathi

2. Objectives materials using ”The Boiling Water Method”
To determine Apparent porosity of refractory
materials using ”The Boiling Water Method”
To determine True specific gravity of material

3. Theory
The Boiling Water method
Apparent porosity :Relation between the volume of a mass and the volume of the water absorbed when the mass is immersed.
= Open pore volume/ Bulk volume
True Porosity :The sum of open pores as determined by water absorptions plus the volume of those pores which are sealed by vitreous matter and therefore closed to water
= Total pore Volume/ Bulk volume
Total bulk volume = Open pore volume + Closed pore volume+ Volume of material.

4. Apparent Porosity D (Dry weight of specimen ) S (Suspended weight )
W (Saturated Weight )

5. Specific Gravity W1 (weight of Pycnometer)
W2 (weight of Pycnometer+ Sample )
W4 (wt of Pycnometer+ Sample+ water )
W3 (wt of Pycnometer+ Sample+kerosene)

6. Role of porosity Thermal conductivity Permeability Surface properties
Thermal resistance of the body
Corrosion

7. Sample Calculation
Apparent porosity (P)% =
Specific Gravity =