Non-Chloride, Non-Corrosive Set Accelerator for Mortar ASTM C1384

Product Description

MORSET® is a non-chloride, non-corrosive admixture that accelerates cement hydration resulting in shortened setting times and increased early strengths. MORSET® is an aqueous solution of organic and inorganic compounds and does not contain any chloride compounds such as calcium chloride.

MORSET® is manufactured to comply with the requirements of ASTM C 1384 Standard Specification for Admixtures for Masonry Mortars.

Product Advantages

  • Non-corrosive
  • Non-chloride
  • Can be used with coated or uncoated steel reinforcement or ties

Product Uses

MORSET® is used wherever it is desirable to reduce the setting time of mortar or stucco. MORSET® is not an anti-freeze admixture nor is it intended to prevent mortar from freezing. When used in conjunction with cold weather practices (see NCMA TEK 3-1), MORSET® provides superior performance and allows for construction to continue.

Features and Benefits

MORSET® speeds up the reaction between the cement and the water so that at any given time, more of the gel, the binder that glues the sand particles together, is produced. The gel provides the set and strength properties of the mortar. It is produced more rapidly in mortar admixed with MORSET® and is responsible for the set acceleration. The formation of gel is accompanied by the generation of heat.

MORSET®, non-corrosive, non-chloride set accelerating admixture provides setting time results and early strength development similar to calcium chloride, but without the corrosive effect of calcium chloride. MORSET® can, therefore, be used where potential corrosion of embedded steel must be avoided. It can be used where uncoated or coated steel reinforcement or ties are present.

Application Information

Because MORSET® does not contain chloride, it does not contribute to efflorescence. When pigments are used to provide a specific color tone, trial batches are recommended to ensure the desired color is developed and to establish the range of addition rates allowed. MORSET® is compatible with other GCP admixtures, but they must be added separately to the mix. Additionally, testing with the specific materials is recommended to ensure the results obtained are acceptable.

Addition Rates

The addition rate of MORSET® will depend upon the acceleration required for specific job conditions. It is recommended that the exact addition rate be determined by testing with the actual materials under job site conditions. The following addition rates are offered as a guideline and are based on average performance with a variety of materials and conditions. MORSET® should be added separately to the mix. It can be added on the sand, in the water, or after all other ingredients are in the mixer.


MORSET® is available in pails, drums and totes.


MORSET® will freeze at approximately -5°F (-20°C) but its properties are completely restored by thawing and thorough agitation.

Suggested Addition Rates oz/bag of cement (mL/bag of cement)

50 (10) 16 (500) 8 (250)
32-50 (0-10) 32 (1000) 16 (500)
20-32 (-7 - 0) 48 (1500) 24 (750)
< -7 64 (2000) 32 (1000) | North America customer service: 1-877-4AD-MIX (1-877-423-6491)

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right. 

MORSET is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies, Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.   

© Copyright 2018 GCP Applied Technologies, Inc. All rights reserved.

GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 450, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.
This document is only current as of the last updated date stated below and is valid only for use in the Canada. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2023-06-29