Selecting Concrete Curing Compound

Use the right curing compound for the job. Not all compounds are compatible with flooring adhesives, for example.

Use the right curing compound for the job. Not all compounds are compatible with flooring adhesives, for example. If you know the standards established by ASTM C-309, you can intelligently find the right product for the job.

ASTM C-309 differentiates between three types of curing compound:
•Type I is a clear compound;
•Type I-D is a clear compound also, with a fugitive dye (a temporary visual indicator); and
•Type II is white pigmented.

Each type is further classified by ASTM C-309 as either Class A, a resin and wax mixture, or Class B, a pure resin mixture.

Type I, clear, is preferred where appearance is a factor.

Type I-D is used where appearance is a factor but you need to be sure you have proper coverage. The dye coloring dissipates over time.

Type II, white pigmented is primarily used on exterior concrete to increase the reflectance, lowering the surface temperature. A lower temperature is desirable since it minimizes the vapor pressure under the membrane. Some Type II curing compounds lose their white color quickly, some do not.

Class A curing compounds are lower in cost but are not suitable where concrete will later be adhered to finish products, such as tile, vinyl, carpet or paint.

Class B compounds will typically dissipate in 30 to 45 days and will allow any surface treatment to be applied. Use ASTM C-309, Type I, Class B for such purposes.

So, the next time your need to select a liquid-membrane curing compound, pick one that works with your job conditions.

Additional cost to use the right material: 0
Additional cost for using the wrong material: Minimum one callback = $$