Assertion: concrete's density | /r/HasProperty | 25 lb/ft³
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Source sentences:
text: Foamed concrete can be produced with dry densities of 400 to 1600 kg/m³ (25 lb/ft³ to 100 lb/ft³), with 7-day strengths of approximately 1 to 10 N/mm² (145 to 1450 psi) respectively.