Grout accelerator for MasterFlow 648/649/678. When MasterFlow 640 is added to MasterFlow 648, MasterFlow 649 or MasterFlow 678, it accelerates the cure rate at low temperatures. MasterFlow 640 should be used in temperatures below 60 °F (16 °C).
When MasterFlow 640 is added to MasterFlow 648, MasterFlow 649 or MasterFlow 678, it accelerates the cure rate at low temperatures. MasterFlow 640 should be used in temperatures below 60 °F (16 °C).
Applications Where heating exterior spaces is impractical When temperatures fall below 60 °F (16 °C) Where high early strengths are required
Accelerated cure rate enables coldweather applications. Early strength development facilitates early return to service. See datasheet for more information.