Master Builders MasterFlow 640 1 Quart Can

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).

Accelerated cure rate enables cold weather pours
Early strength development facilitates early return to service

$91.54

SKU

20110

Details

MasterFlow 640 Grout Accelerator - Enhance Cure Times in Cold Weather

MasterFlow 640 is a high-performance grout accelerator designed to optimize the curing process for MasterFlow grouts in cold weather conditions. When added to compatible grouts such as MasterFlow 648, 649, or 678, this accelerator improves early strength development, enabling faster project completion and enhanced performance in low-temperature environments. Ideal for professional applications, MasterFlow 640 ensures reliable results in challenging conditions, making it an essential additive for industrial and construction grouting.

Key Features:

Accelerates curing process for cold-weather applications
Improves early strength development for faster project completion
Compatible with MasterFlow 648, 649, and 678 grouts
Optimized for temperatures below 60°F (16°C)
Convenient 1-quart can for precise dosing

Applications:

Grouting for construction projects in cold environments
Industrial applications requiring accelerated grout performance
Use in areas where heating exterior spaces is impractical
Projects requiring high early strengths for rapid return to service

Technical Specifications:

Specification	Details
Packaging	1 quart can
Shelf Life	1 year when stored at 60–80°F (16–27°C)
Recommended Usage	Add 1 quart to each full-size kit of compatible grout
Temperature Range	Optimized for temperatures below 60°F (16°C)

Frequently Asked Questions:

What is MasterFlow 640 used for?
MasterFlow 640 is a grout accelerator used to speed up the curing process of MasterFlow grouts, such as 648, 649, and 678, particularly in cold weather conditions.

How is MasterFlow 640 applied?
Add 1 quart of MasterFlow 640 to the grout mixture according to the instructions provided in the grout product data sheet. Stir thoroughly before use.

Can it be used in temperatures above 60°F?
MasterFlow 640 is specifically formulated for use in temperatures below 60°F (16°C). For higher temperatures, consult the product data sheet or manufacturer’s recommendations.

What is the shelf life of MasterFlow 640?
The product has a shelf life of 1 year when stored properly in unopened containers between 60–80°F (16–27°C).

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