OPTEC® EC-250 Data Sheet

Efflorescence Control Admixture

Product Description

OPTEC® EC-250 admixture is designed to enhance the quality and appearance of concrete pavers, segmental retaining wall units and other low slump concrete products. OPTEC® EC-250 admixture controls secondary efflorescence thus enhancing color. It also provides excellent mix plasticity and machinability which helps reduce overall production cycle times.

Product Advantages

  • Minimizes secondary efflorescence
  • Increased throughput
  • Increases densities
  • Lowers absorption
  • Improves surface texture

Product Uses

OPTEC® EC-250 admixture is used to reduce secondary efflorescence, provide good machinability and improve unit densities. It can be used for concrete pavers, architectural concrete masonry units or segmental retaining wall units where increased mix plasticity and efflorescence control are desired.

Product Function

OPTEC® EC-250 admixture improves the dispersion of the cement throughout the mix resulting in more complete cement hydration and thus providing higher early and ultimate unit strengths. OPTEC® EC-250 admixture may also allow for increased water in the mix which also promotes more complete cement hydration.

Application Information

Addition Rates:OPTEC® EC-250 admixture is typically used at a rate of 6 -12 oz/cwt (390 -780 mL/100 kg) of cementitious materials, including pozzolans. The addition rate is dependent upon the specific set of materials and the desired end properties.OPTEC® EC-250 admixture should be added separately to the mix after the initial wetting of the cement and before or with the addition of the final mix water. Once it is batched, it should be mixed for a minimum of one minute, but preferably two minutes. Mix times of less than one minute should be avoided. Never add OPTEC® EC-250 admixture to dry cement.


OPTEC® EC-250 admixture is available in 55 U.S. gallon (208 L) drums and 275 U.S. gallon (1,040 L) returnable totes.

Health & Safety

All precautions defined on the SDS (Safety Data Sheet) for OPTEC® EC-250 must be followed.


OPTEC® EC-250 admixture must be protected from freezing at temperatures of 32ºF (0ºC) and below, as the admixture is not usable once frozen.

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This document is only current as of the last updated date stated below and is valid only for use in the United States. 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 www.gcpat.com. 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