Rapid Set® FAST: Increases the rate of hardening for cement

For cold-weather applications or whenever fast set times are desired, choose FAST. Use with Rapid Set® cement products and most other packaged hydraulic cements, FAST accelerating additive increases the rate of hardening for cement.



The Datasheet explains the performance and technical characteristics of Rapid Set® FAST.  It also shows how to use FAST.


The Safety Data Sheet (SDS) outlines information and procedures for handling and working with Rapid Set® FAST.  It includes physical and chemical property information, potential hazards, emergency procedures and CTS’s contact information.


coming soon

Standard Practices

Q: What is FAST?
 It is an accelerating additive designed to speed your cement material’s hardening.

Q: How much is in a packet?
 Each packet is 80 grams (2.83 ounces).

Q: How much do I need to use?
 Use 1 to 4 packets per 55 to 60 lb. bag depending on your project’s need. A trial batch is recommended to fine-tune your dosage and mix procedure.

Q: How do I add it to my mix?
 Adding it to your mix water before adding the Rapid Set® material will give you better distribution in your mix.

Q: Can I use it with other additives?
 It can be used with other Rapid Set® Concrete Pharmacy® items or certain approved additives.

Q: Can I add it to other portland cement products?
 FAST will accelerate the set of other portland cement materials. A trial batch is recommended to determine your proper dosage.

Jobs & Applications

coming soon

Leed Product Evaluation

TechnicalSupportWhether you’re working on a time-sensitive project and need answers, or evaluating and choosing the right cement products, or looking to achieve specific results, we are here to help. Get answers to your questions from our technical support team. Find and download useful information from our website. Ask us to help get your construction team up to speed by requesting a jobsite demonstration or educational seminars.

ConcreteCalculatorLearn how Rapid Set’s strength, speed and sustainability help you get better results and finish your jobs sooner. These Charts will show you how.

ProductEvaluationLEED product evaluations summarize a product’s ability to contribute to a variety of LEED credits. These credits include Solar Reflectivity (SS7), Regional Materials (MR4), Recycled Content (MR5), VOC Content (EQ4) and Innovation in Design (ID1).

Skip to toolbar