Sodium Gluconate: Performance Characteristics, Application Areas, and Selection Guide

1. Product Overview

Sodium Gluconate (CAS No. 527-07-1) is a polyhydroxy carboxylic acid sodium salt with the molecular formula C₆H₁₁NaO₇. It appears as white crystalline granules or powder, is readily soluble in water, slightly soluble in alcohol, and insoluble in ether.

Sodium Gluconate is a biodegradable organic compound with chelating properties, stability, and retarding effects. Its molecular structure contains multiple hydroxyl and carboxylate groups, providing strong chelating capacity to form stable complexes with calcium, magnesium, iron, and other metal ions. The product is available in industrial grade and food grade, with industrial grade content typically ≥98% and food grade purity ranging from 99% to 102%.

2. Typical Technical Specifications

Note: The above data represent typical specifications. Values may vary by grade or batch. Please refer to the product test report for specific parameters.

3. Key Performance Characteristics

3.1 Retarding Effect

Sodium Gluconate is a commonly used retarding component in concrete. When added to concrete, it delays the cement hydration process and extends both initial and final setting times. At dosages below 0.15% of cement mass, the logarithm of initial setting time shows a linear relationship with dosage, allowing workable time to be extended from a few hours to several days.

When used in combination with polycarboxylate or naphthalene-based superplasticizers, sodium gluconate improves cement paste fluidity, extends initial setting time, and helps address compatibility issues between superplasticizers and cement.

3.2 Water-Reducing Effect

Sodium Gluconate provides a certain level of water reduction. The water reduction rate of admixtures increases with the addition of sodium gluconate, with more noticeable effects when combined with superplasticizers. Under fixed total dosage conditions, the combined use of sodium gluconate and naphthalene-based superplasticizers improves cement paste fluidity and its retention over time.

3.3 Chelating and Scale-Inhibiting Properties

Sodium Gluconate exhibits strong chelating capacity for calcium, magnesium, iron, and other metal ions, forming stable complexes. When used as a water stabilizer in water treatment, it provides corrosion inhibition and scale prevention, making it suitable for circulating cooling water systems and low-pressure boiler water treatment. Its biodegradable nature offers environmental advantages in water treatment applications.

3.4 Industrial Cleaning Performance

Sodium Gluconate performs well in steel surface cleaning and glass bottle washing:

• Steel Surface Cleaning: Used in pre-electroplating treatment to help coatings bond firmly to steel surfaces, with applications in tinplate manufacturing.

• Glass Bottle Washing: Cleaners based on sodium gluconate provide effective dirt removal, reduce pipeline blockages, avoid phosphate residue issues, and simplify wastewater treatment.

sodium-gluconate

4. Main Application Areas

4.1 Concrete Industry

Sodium Gluconate is primarily used as a retarder and water reducer in concrete:

• Retarding Effect: Delays initial and final setting times, suitable for high-temperature construction and mass concrete pours.

• Water Reduction: Reduces mixing water demand and improves concrete workability.

• Strength Development: Supports strength gain at various ages when combined with superplasticizers.

• Synergistic Use: When combined with polycarboxylate or naphthalene-based superplasticizers, it improves slump retention, extends workable time, and enhances cement compatibility.

Recommended Dosage: When used as a retarder, the suggested dosage is typically 0.03%–0.06% of cement mass. The specific dosage should be determined through trials based on construction conditions and cement type. Excessive dosage may significantly extend setting time or reduce strength, so dosage should be kept within a reasonable range.

4.2 Industrial Cleaning

• Steel Surface Cleaners: Used in pre-electroplating cleaning processes for galvanizing, chrome plating, and tin plating.

• Glass Bottle Cleaners: Suitable for cleaning glass containers such as beverage bottles and beer bottles.

4.3 Water Treatment

Used as a water stabilizer for corrosion inhibition and scale prevention in circulating cooling water systems, low-pressure boilers, and engine cooling systems in petrochemical plants. Sodium gluconate shows synergistic effects with molybdate, silicate, phosphate, tungstate, and nitrite formulations, with corrosion inhibition rates increasing with temperature.

4.4 Other Industrial Applications

• Textile Industry: Used as a leveling agent to improve dyeing uniformity and fixation rate.

• Electroplating Industry: Used as an aluminum oxide colorant.

• Pharmaceuticals and Food: Helps regulate acid-base balance and is used as a food additive in low-sodium products.

5. Usage Recommendations and Precautions

5.1 Dosage Control

When used as a retarder in concrete, the recommended dosage is typically 0.03%–0.06% of cement mass, with specific dosages determined through trials. Under single-dosage conditions, the retarding effect increases with dosage, but excessive amounts may lead to reduced concrete strength. Dosage should be kept within an appropriate range.

5.2 Combined Use

Sodium Gluconate is often used together with polycarboxylate or naphthalene-based superplasticizers. When combining, compatibility between the retarding component and the superplasticizer may vary at different dosage levels. It is advisable to determine the optimal blending ratio through testing.

5.3 Product Selection

Sodium Gluconate is available in industrial grade and food grade. Industrial grade is suitable for concrete, industrial cleaning, and water treatment; food grade should be used in pharmaceutical and food applications.

5.4 Storage Conditions

The product should be stored in sealed containers in a cool, ventilated, and dry place to avoid moisture absorption and caking. It should not be stored together with toxic or contaminated chemicals.

6. How to Choose Sodium Gluconate Products?

When selecting sodium gluconate products, consider the following aspects:

1. Content
Content is a key indicator of product quality. Industrial grade generally requires ≥98% content, with food grade requiring higher levels.

2. Reducing Substance Content
Reducing substance content reflects product purity. Industrial grade typically requires ≤1.0%, while food grade requires ≤0.5%.

3. Insoluble Matter and Impurity Control
Quality products contain low levels of water-insoluble matter, with heavy metals, arsenic, and other impurities meeting applicable standards.

4. Application Matching
Select the appropriate grade and specification based on the intended use to avoid over-specification or under-specification.

5. Supplier Qualifications
Choose suppliers that can provide product test reports, reliable supply capability, and technical support.

7. About Shenyang Xingzhenghe Chemical

Shenyang Xingzhenghe Chemical Co., Ltd. (www.xzhch.com) is a supplier specializing in concrete admixtures and construction chemical raw materials, established in 2009. The company’s product range includes sodium gluconate and lignosulfonate series.

The company has experience in the supply of sodium gluconate products, serving applications including concrete retardation and water reduction, industrial cleaning, and water treatment, with distribution across domestic regions and international markets.

8. Conclusion

Sodium gluconate, as a versatile organic salt, provides retarding, water-reducing, chelating, and scale-inhibiting functions in concrete, industrial cleaning, water treatment, and other applications. When selecting sodium gluconate products, factors such as content specifications, application matching, and supplier capabilities may be considered.

Shenyang Xingzhenghe Chemical Co., Ltd. is committed to providing sodium gluconate and related construction chemical raw material solutions to its customers.

Contact Us:

Company: Shenyang Xingzhenghe Chemical Co., Ltd.
Website: www.xzhch.com
Phone: +86 13889850231
Email: sales01@xzhch.com
Address: No. 33, Nan’er Road, Heping District, Shenyang, China