Strength Grade Name Degree of Fineness Setting Time Constancy Breaking Strength Compressive Strength Alkalinity Loss On Ignition Initial Set Final Set 3 days 28days 3 days 28days 32.5R national standard ≤10.0 ≥45min <10.0h qualified ≥3.5 ≥5.5 ≥16.0 ≥32.5 <5.0 Ours standard <5.0 >60min <6.5h qualified ≥4.0 ≥7.0 ≥19.0 ≥36.0 <0.6 <4.5 42.5 national standard ≤10.0 ≥45min <10.0h qualified ≥3.5 ≥6.5 ≥16.0 ≥42.5 <5.0 Ours standard <4.0 >60min <6.5h qualified ≥4.5 ≥7.5 ≥19.0 ≥46.0 <0.6 <3.5 42.5R national standard ≤10.0 ≥45 <10.0h qualified ≥3.5 ≥6.5 ≥21.0 ≥42.5 <5.0 Ours standard <4.0 >60min <6.5h qualified ≥4.6 ≥7.5 ≥24.0 ≥46.0 <0.6 <3.0