MasterFlow 640
Grout accelerator for MasterFlow 648
Formerly: MasterFlow 648 CP Grout Accelerator
How does MasterFlow 640 work?
When MasterFlow 640 is added to MasterFlow 648, it accelerates the cure rate at low temperatures. MasterFlow 640 should be used in temperatures below 60º F (16º C).
Recommended uses:
- Where heating exterior spaces is impractical
- Where temperatures fall below 60º F (16º C)
- Where high early strengths are required
What are the unique features of MasterFlow 640?
- Accelerated cure rate
- Early strength development
What are the benefits of MasterFlow 640?
- Enables cold-weather applications
- Early return to service
Data Guide 
Safety Data Sheet