Ordinary Portland Cement P.O 42.5R

Ordinary Portland Cement P.O 42.5R Per Chinese Standard GB175-1999 SpecificationsGB175-2007 RequirementTypical Ex-Plant Test ResultChemical AnalysisLoss on ignition (%)≤5.03.4MgO (%) ≤5.0 (NB)4.5SO3 (%)≤3.51.9Chloride (%)≤0.060.01Physical PropertiesChemical AnalysisOKOKBlaine permeability (m2/kg)≥300390Initial setting time (min)≥45160Final setting time (min)≤600237Compressive strength 3 days (Mpa)≥21.025.5Compressive strength 28 days (Mpa)≥42.552.5Flexural strength 3 days (Mpa)≥3.55.1Flexural strength 28 days (Mpa)≥6.57.8NB: When MgO is more than 5% but less than 6%, a pressure steam stability test is required. If the sample passes the pressure steam stability test, the product is still qualified.