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Table 1 Chinese Building Lime Standard JC/T 481-1992

From: Building limes for cultural heritage conservation in China

Grade Calcium quicklime Magnesium quicklime
  Premium First-class Qualified Premium First-class Qualified
Content of CaO + MgO,%, no less than 90 85 80 85 80 75
Content of unslaked residue (5 mm round-hole residue on sieve),%, no more than 5 10 15 5 10 15
CO2,%, no more than 5 7 9 6 8 10
Yield of lime hydrate, L/Kg, no less than 2.8 2.3 2.0 2.8 2.3 2.0