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

US / Canada Product Information

Certification Letter

Data Guide

Data Guide (Spanish)

Data Guide (French)

LEED Letter 

Direct contact

Master Builders Solutions Technical Support

Construction Systems


Safety Data Sheet (SDS)

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Product Certifications

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Related Literature

Certification Letter

pdf (76.47 Kb)

Data Guide

pdf (100.59 Kb)

LEED Letter

pdf (92.38 Kb)

MasterFlow 640 Data Guide (French)

pdf (79.90 Kb)

MasterFlow 640 Data Guide (Spanish)

pdf (183.92 Kb)