Please login with your username and password.


Can’t remember your accounts password?

Can't access your account?

Select your language.

This page is available in the following languages:

    Please select your location

    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)

    Find all available safety data sheets for this product.

    Product Certifications

    Generate a free certificate of conformance for a specific BASF construction product.

    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)