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Sodium Gluconate is a bio-based organic chelating agent and a highly effective cement set retarder extensively used in construction chemicals, concrete admixtures, and dry-mix mortar formulations. It works by selectively complexing free calcium ions released during the early stages of cement hydration, thereby slowing the hydration of tricalcium silicate (C₃S) and tricalcium aluminate (C₃A) phases.
This controlled interaction delays setting without adversely affecting long-term cement strength.
In construction and dry-mix mortar applications, sodium gluconate is widely valued for its ability to extend open time, improve workability, and maintain consistent rheology, even under hot weather or low water-cement ratio conditions. It enables smoother application, better flow, and enhanced surface finish in tile adhesives, tile grouts, repair mortars, self-leveling compounds, plasters, and ready-to-use dry mortars.
Unlike traditional lignosulphonate-based retarders, sodium gluconate offers predictable and uniform setting control, minimal air entrainment, and improved compatibility with modern additives such as redispersible polymer powders (RDPs), cellulose ethers (HPMC/HEMC), and PCE-based superplasticizers. Its chelating action also helps reduce efflorescence, improves cement dispersion, and supports better strength development at later ages.
Because of its high purity, excellent solubility, and low dosage efficiency, sodium gluconate is a preferred retarder for high-performance construction formulations, particularly in hot climates, large-area installations, and applications requiring extended working time without loss of final strength.
Gluconic Acid Sodium Salt, Sodium D-Gluconate
218.14 g/mol
527-07-1
208-407-7
2918.16.00 (may vary slightly by customs classification)
Not classified as dangerous goods / Non-hazardous for transport
White crystalline powder / granular solid
≥ 98% Sodium Gluconate (industrial / construction grade)
Crystalline organic salt
~1.7 – 1.9 g/cm³
Not applicable (organic salt)
Highly soluble in water
Slightly soluble in alcohol
Insoluble in most organic solvents
Neutral to mildly alkaline (approx. pH 6.5 – 8.5)
Stable under normal storage and processing conditions
Decomposes at elevated temperatures (> ~200 °C)
Suitable for cementitious and construction applications under normal curing and service temperatures
Tile adhesives
Wall putty
Plaster and rendering mortars
Self-levelling compounds
Polymer-modified repair mortars
Non-shrink grouts
Anchoring and gap-filling systems
Ready-mix concrete
Hot weather concreting
Pumped concrete and screeds
Waterproofing slurries
Protective cement coatings
Levelling and smoothing compounds
| Property | Typical Value |
|---|---|
| Chemical Name | Sodium Gluconate |
| Appearance | White crystalline powder |
| Solubility | Fully soluble in water |
| Chloride Content | Nil |
| pH (10% solution) | Mildly alkaline |
| Form | Free-flowing solid |
Allows sufficient time for placement, finishing, and adjustment—especially critical in dry-mix and tile adhesive systems.
Better dispersion and slower setting result in smoother, more uniform surfaces.
Prevents flash set and rapid stiffening under high ambient temperatures.
Properly dosed sodium gluconate supports better long-term compressive strength.
Improves rheology in pumped mortars and concrete.
Suitable for reinforced concrete applications.
Actual dosage depends on cement type, temperature, formulation design, and required setting delay. Laboratory trials are recommended.
Dosage: 0.02 – 1% by weight of cement
Used to control open time and improve workability.
Dosage: 0.03 – 0.15% by weight of cement
Helps extend pot life and improve placement without strength loss.
Dosage: 0.02 – 0.08% by weight of cement
Controls setting time and reduces slump loss.
Dosage: 0.05 – 0.20% by weight of cement
Prevents premature stiffening and improves finishing window.
Sodium gluconate is low-hazard and safe when handled correctly.
Safety goggles
Gloves
Dust mask during handling
Refer to the Safety Data Sheet (SDS) for complete safety guidance.
25 kg HDPE-lined paper bags