Applicable Standards for LITHOCHROME® Chemstain® Classic

Newly placed concrete should be sufficiently cured, a minimum of 14 days. However, on interior applications of the Chemstain colors Copper Patina, Fern Green, and Weathered Bronze, the concrete must be sufficiently dry (typically 14­28 days) so that the Moisture Vapor Emission Rate (MVER) is less than 5 pounds per 1000 square feet per 24 hours (2.5 kilograms per 100 square meters per 24 hours) based on a 72 hour test period per ASTM F1869. The Warning Section on page 1 should be read.

Liquid curing materials must not be used. Concrete flatwork should be cured with new and unwrinkled, nonstaining, high-quality curing paper conforming to ASTM C 171 Sheet Materials for Curing Concrete.

Exterior flatwork or interior floors topped with SCOFIELD Texturetop must be sufficiently cured to walk on without damage prior to staining, at least 4­8 hours after installation at 70° F (21° C). SCOFIELD Texturetop cures at a rate similar to concrete and retains moisture which, when using the LITHOCHROME Chemstain Classic colors Copper Patina, Fern Green, or Weathered Bronze, can in some instances cause darkening if the Chemstain solution is applied too early. Prior to using these colors, the Texturetop topping must be sufficiently cured, normally 14­28 days, and the Moisture Vapor Emission Rate (MVER) of the topping should be less than 5 pounds per 1000 square feet per 24 hours (2.5 kilograms per 100 square meters per 24 hours) based on a 72 hour test period per ASTM F1869.