OPC 42.5N/R according to BS 12/96 or ASTM C-150 or CE-197, SABS, BIS, GB175-1999 and so on.

  SPECIFICATIONS ARE AS FOLLOWS

GREY PORTLAND CEMENT FOR CONSTRUCTION GRADE 42.5 ACCORDING TO BRITISH AND EN 197-1/2000 OR ASTM C 150

Chemical Composition

SILICON DIOXIDE (SIO2) 20.08 - 21.50
ALUMINIUM OXIDE (A12O3) 5.30
FERRIC OXIDE (FE2O3) 3.25 3.50
CALCIUM OXIDE (CAO) 65.60
MAGNESIUM OXIDE (MGO) 1.70 3.00
SULPHUR TRIOXIDE (SO3) 2.70 3.00
LOSS OF IGNITION (LOI) 1.80 3.00

INSOLUBLE RESIDUE % 0.1 0.7

TRICALCIUM SILICATE (C3S) 50.00 54.40
DICALCIUM SILICATE (C2S) 14.2 18.20
TRICALCIUM ALUMINATE (C3A) 6.00 6.80
TRICALCIUM ALUMINO FERRICE (C4AF) 11.60

CHROMIUM (CR%) 2.0 MAX

Physical and Mechanical Properties

BLAIN CM2/GR 3.250
AUTOCLAVE EXPANTION 0.02

NORMAL CONSISTENCY % 27.5

INITIAL SETTING TIME (VICAT)(HOURS-MINS) 3.25-4.50

HARD SET (HOURS-MINS) 4.54 6.00
FITNESS INDEX (CM2/GM) 2800-3040

COMPRESSIVE STRENGTH ISO/EN 197-1/2000 BS 4550 MORTAR

@ 03 DAYS 2.65 34.2 KG/CM2

@ 07 DAYS 37.3 42.5 KG/CM2

@ 28 DAYS 52.8 54.6 KG/CM2

British Standard Clinker

EXAMINE ITEM       GUARANTEED

CAO                      64%MIN

 SIO2                     20.0-23.0%

AL2O3                    4.0-5.5%

FE2O3                    2.0-3.5%

MGO                     3.3-4.5%

SO3                      1.0%MAX

LOSS OF IGNITION        1.5%MAX

F-CAO                    1.5%MAX

INSOLUBLE RESIDUE      0.75%MAX

(NA2O+0.65K2O)           0.60%MAX

C3S                      50-65%