Concrete Superplasticiser

Product Description

DARACEM® 303 is a high performance superplasticiser designed specially to impart high workability to concrete containing silica fume, while possessing excellent slump retention properties. It can also be used in normal concrete mix designs where high workability is required for long periods, to aid placement, such as piling concrete, congested areas of reinforcement, etc.

DARACEM 303 is based on selected raw materials and is manufactured under controlled conditions to give a consistent product. It is formulated from specially designed polymeric sulphonate materials and naturally derived products. DARACEM 303 meets the requirements of ASTM C-494 Type G and BS 934-2.

Appearance dark brown liquid
Specific Gravity 1.22 at 20°C
Air Entrainment 0.5% approx.
Chloride Content Nil


  • Effective over a wide range of cement contents and w/c ratios
  •  Aids concrete cohesion.
  • Imparts excellent slump retention over prolonged periods of time.
  • Allows greater time for placement and compaction, especially in concrete containing silica fume.
  • Can be used to achieve large water reductions in concrete, to obtain high early and ultimate compressive strength gains as required in precast / pre-stressed concretes. 

Addition Rates

Range: 0.4%–3.2% volume by weight of cement

The performance of DARACEM 303 is best assessed after preliminary trials in the laboratory or on site, using the actual mix constituents under consideration, to determine the optimum dosage and effect on concrete properties such as compressive strength, setting times, workability retention, etc. when these are of consequence.

As a guide to these trials, an addition rate of 400 ml–3200 ml DARACEM 303 per 100 kg cement is recommended.

For silica fume concrete mixes, addition rates greater than 1500 ml per 100 kg cement are recommended, but lower dosage levels may be feasible following trial mixes and depending upon w/c ratios.

Method of Use 

DARACEM 303 is supplied ready for use. It should be added to the concrete mixes during the mixing process at the same time as the water. It should not be added directly to the cement.

For mixes containing silica fume, DARACEM 303 should be incorporated into the mix after the addition of the silica fume, at the same time or just after the mix water. DARACEM 303 should not be added to slurrified silica fume before addition to the mix.

Compatibility with Cements

DARACEM 303 can be used with all types of Portland, Pozzolanic and Blast Furnace cements. It can also be used in mix designs containing fly ash, and/or silica fume.

Compatibility with other Admixtures

DARACEM 303 should not be premixed under any circumstances with other admixtures. While some admixtures can be usefully combined within the same mix the performance of this product may well be affected by the presence of other chemicals and we recommend that GCP Applied Technologies be contacted for advice in all such circumstances.

Effects of Overdosing

Overdosing of DARACEM® 303 will generally produce an increase in workability and a slight increase in air entrainment, which will be accompanied by a delay in the concrete setting time

However, provided the overdosed concrete is cured properly, the ultimate strength will generally be higher than normal concrete.

The effects of overdosing with respect to set retardation are increased when sulphate resisting cement (Type V) is used in the mix design.


It is preferable that liquid admixtures for concrete should be introduced into a mixer by means of automatic dispensing equipment details of which are available upon request.

Health and Safety

For further information see the DARACEM 303 SDS (Safety Data Sheet) or consult GCP.


DARACEM 303 is supplied in 210 litre, non-returnable containers.

Alternatively, 1000 litre IBCs or bulk deliveries can be arranged.


DARACEM 303 should be stored in original containers or suitable closed tanks, preferably out of direct sunlight and protected from extremes of temperature.

Shelf Life in Manufacturer’s drums and IBCs:

12 months from the date of manufacture

Shelf Life in Bulk Storage:

12 months from the date of delivery

Technical Service

The Technical Service Department of GCP is available to assist you in the correct and best use of our products. These resources and advice are at your disposal entirely without obligation. Please contact

Emirates Chemicals LLC
Festival Tower, Suite 1701
Dubai Festival City
P.O. Box 5006
Dubai, United Arab Emirates
Tel: +971 4 2329901
Fax: +971 4 2329940
Email: meinfo@grace.com

gcpat.ae | United Arab Emirates customer service: +971 4 5139560

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.

DARACEM 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., 62 Whittemore Avenue, Cambridge, MA 02140 USA.

Emirates Chemicals LLC, Festival Tower, Suite 1701, Dubai Festival City, P.O. Box 5006, Dubai, United Arab Emirates.

GCP0082-1216 DARACEM 303-UAE

This document is only current as of the last updated date stated below and is valid only for use in the UAE. 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.ae. 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: 2021-02-05