BIS Specifications and SDCC norms of 43 GRADE OPC
BIS Specifications and SDCC norms of 53 GRADE OPC

Portland cement construction grade 42.5 n/r OPC
Portland PC – CP CEM 1- 52.5 Cement
 
     
 
A)
 CHEMICAL COMPOSITION      
1
 Insoluble Residues(IR)
%
3.0 Max
2.0 Max.
2
 Magnesium Oxide(MgO)
%
6.0 Max
2.5 Max.
3
 Sulphuric Anhydride(S03)
%
2.5 Max when
C3A<5 & 3.0 Max when C1A>5
2.75 Max.
4
 Loss on Ignition(LOI)
%
4.0 Max
3.0 Max.
5
 Lime Saturation Factor (LSF)
%
0.80-1.02
0.90 Min.
6
 Alumina Iron ratio (A/F)
%
0.66 Min.
1.10 Min.
7
 Chloride (Cl-)
%
0.10 Max.
0.05 Max
         
B)
 PHYSICAL PROPERTIES      
1
 Specific Surtace
m2/kg
225 Min.
290 Min.
2
 Soundness (Expansion)      
  a) By Le-Chatelier
mm
10.0 Max.
3.0 Max.
  b) By Autoclave
%
0.8 Max.
0.2 Max
3
 Setting Time      
  a) Initial Set
Minute
30 Min.
60 Min.
  b) Final Set
Minute
600 Max.
250 Max.
4
 Compressive Streng1h      
  a) 3 days
MPa
27 Min.
35 Min.
  b) 7 days
MPa
37 Min.
45 Min.
  c) 28 days
MPa
53 Min.
58Min.
 
     
 
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