PPC derives its name from the volcanic ashes of the Pozzuoli volcano in Italy. PPC is a value based cement, which is produced by grinding the combination of good quality Portland Cement Clinker, Gypsum and Pozzolana materials such as Fly Ash.

Although Pozzolana does not have cement properties, it forms a strong cementing material (calcium silicate hydrate gel) when exposed to lime (calcium hydroxide) at normal temperature in presence of water.

PPC makes concrete more impermeable and denser as compared to Ordinary Portland Cement and is stronger in the long term. It produces less heat of hydration and offers greater resistance to the attack of aggressive waters than Ordinary Portland Cement. Moreover it reduces the leaching of calcium hydroxide liberated during the setting and hydration of cement.


Reliance PPC is ideally suited for the construction of the following:

  • Hydraulic structures
  • Mass concreting works
  • Marine structures
  • Masonry mortars and plastering




Characteristics Reliance Cement National Standard (NS) 385
Fineness (m2/kg) 345 300
Setting Time (minutes):    
Initial 75 45
Final 175 600
Le Chatelier (mm) 6 10 Max.
Auto Clave (%) 0.65 0.8 Max.
Compressive Strength (kg/cm²):    
3 days 270 160
7 days 370 220
28 days 530 330

Chemical Characteristics

Characteristics Reliance Cement National Standard (NS) 385
Lime Saturation Factor (LSF) 0.89 0.66 to 1.02 Max.
Alumina to that of Iron Oxide Ratio % 1.41 3.0 Max.
Loss on Ignition (% by mass) 1.94 5.0 Max.
Magnesia (% by mass) 2.20 6.0 Max.
Insoluble Residue (% by mass) 1.12 X + 4(100 – X)/100 Max.¹
Sulphuric Anhydride (% by mass) 1.85 3.0 Max.
Chloride (% by mass) 0.024 0.05 Max.

¹ Where X is the % of Pozzolana material content in the Raw mix.
Cement is tested at a temperature of 27 ° C +- 2 ° C.
The above cement complies with Nepal Bureau of Standards