OPTEC® EC-972 is a liquid based water-repellent admixture which has been specially formulated for use in semi-dry mix designs, where the incidence of efflorescence is undesirable.
OPTEC® EC-972 has particular benefit when used in the production of concrete block paviors, tiles etc. when control of primary and secondary efflorescence and a reduction of the ingress of moisture is required.
OPTEC® EC-972 is formulated from a stable high performance aqueous silane oligomer dispersion, resulting in superior performance in all precast units. The silane forms a hydrophobic lining within the capillary pores, preventing or reducing water movement. OPTEC® EC-972 is manufactured under carefully controlled conditions, to produce a highly consistent product. OPTEC® EC-972 complies with EN 934-2.
| OPTEC® EC-900 | ||
| Appearance | White liquid | |
| Air Entrainment | Minimal in semi-dry mixes | |
| Chrloride Content | 0⁰C | |
OPTEC® EC-972 is supplied ready for use and should be added to the mix at the same time as the mixing water. OPTEC® EC-972 may be used in all zero or low slump concretes where control of efflorescence is beneficial. Dosage will vary depending on the desired properties. Efflorescence control can be achieved using addition rates as low as 500 mls per 100 kg of cement. However, if high temperature curing is utilised, a higher dosage may be required. Overdosing in semi-dry mixes will yield a more plastic mixture, and problems may be experienced with edge slumping of cast masonry units. A reduction in compressive strength may also be noticed.
| Range | 500 - 1500 ml per 100 kg cementitious / powder |
| 0.50% - 1.50% (v/w) by wt. of cement | |
| For best results it is recommended that OPTEC EC-972 performance is first assessed in preliminary tests using the actual mix constituents to determine the optimum dosage. | |
| For advice and assistance with trials we recommend that you consult GCP Applied Technologies. | |
With Cements :
OPTEC® EC-972 can be used with all types of cements, including limestone cements. It is also effective in concretes containing fly ash or ground granulated blastfurnace slag. For use with special cements we recommend you to contact GCP Applied Technologies.
OPTEC® EC-972 should not be pre-mixed with other admixture prior to addition to the mix. The performance of the admixture may be affected by the presence of other chemicals, and we would recommend that GCP be consulted in such circumstances.
It is preferable that liquid admixtures for concrete should be introduced into the mixer by means of automatic dispensing equipment.
OPTEC® EC-972 is supplied in 205 litre nonreturnable containers. Alternatively, bulk deliveries can be arranged.
OPTEC® EC-972 should be stored above 0°C and protected from frost, otherwise permanent damage may occur. In common with most emulsions, if OPTEC® EC-972 is allowed to freeze, the damage is irreversible and the product cannot be reconstituted.
Storage Life in Manufacturer ‘s Drums:
6 months from date of manufacture.
Storage Life in Bulk Storage:
6 months from date of delivery.
For further information on Health and Safety matters regarding this product we recommend that you consult the relevant Safety Data Sheet from GCP Applied Technologies.
Our Technical Service department of GCP Applied Technologies is available to assist you in the correct use of our performance chemicals.
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.
OPTEC 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.
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GCP Applied Technologies (UK) Ltd, Gate St, Dukinfield SK16 4RU.
This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. 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.uk. 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: 2025-05-13
https://gcpat.uk/en-gb/solutions/products/optec-ec-972