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Monosodium Citrate for Polymer & Plastics Applications

Monosodium Citrate in Polymer Processing 

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Monosodium Citrate for Polymer & Plastics Applications

Citribel is a Monosodium Citrate manufacturer in Europe, supplying monosodium citrate powder and granular grades for polymer and plastics applications worldwide.

In thermoplastic processing, achieving controlled density reduction, predictable decomposition behavior and fine cell morphology is critical. Monosodium citrate (MSC) can function as an endothermic chemical blowing agent in selected polymer systems, offering controlled CO₂ release and stable foam development.

Produced in Belgium via surface fermentation using Aspergillus niger, Citribel ensures European manufacturing, traceability and reliable bulk supply .

Monosodium Citrate in Polymer & Plastics

Endothermic Blowing Agent for Thermoplastics

Monosodium citrate decomposes at approximately ±217 °C, releasing:

  • Carbon dioxide (CO₂)

  • Water (H₂O)

Because the reaction is endothermic, heat is absorbed during decomposition. This contributes to:

  • Improved processing stability

  • Reduced overheating risk

  • Controlled foam expansion

  • Fine, homogeneous cell morphology

Literature reports gas yields of 185–240 mL/g depending on formulation and processing parameters.

Typical loading levels:

  • 0.5–1.0% active content

  • Density reduction of 12–32% under optimized conditions

This makes Monosodium Citrate in polymer & plastics relevant for lightweight and technical components.

Clean Decomposition Profile

Unlike nitrogen-based blowing agents, monosodium citrate produces:

  • No nitrogen-containing residues

  • No hazardous decomposition by-products

Only carbon dioxide and water are released, simplifying environmental and workplace safety considerations.

Clean Decomposition Profile

Compared to free citric acid, monosodium citrate:

  • Has lower acidity

  • Is less corrosive to equipment

  • Reduces wear in extrusion systems

This is particularly relevant for continuous extrusion and injection molding operations.

Polymer Systems & Application Areas

Polyolefins (PE, PP)

Applications include:

  • Lightweight packaging

  • Insulation components

  • Technical molded parts

Processing temperatures are typically compatible with MSC activation.

PVC & Engineering Plastics

Monosodium citrate may be evaluated where:

  • Controlled density reduction is required

  • Clean decomposition is important

  • Stable processing is critical

Biodegradable & Bio-Based Polymers

Relevant in:

  • Starch-based thermoplastics

  • PLA blends

  • Bio-based compounds

Its fermentation origin aligns with circular polymer strategies.

Monosodium Citrate Supply Options

As a Monosodium Citrate supplier, Citribel provides:

 Powder Grade

  • 250 µm: max. 5%

  • < 75 µm: min. 65%

Granular Grade

  • 425 µm: max. 10%

  • < 75 µm: max. 30%

Controlled particle size supports reproducible dispersion and foam morphology. Full specification available . Bulk volumes available for industrial processing.

Technical Product Profile

Citribel supplies monosodium citrate, compliant with DAC and JECFA and EU Regulation 231/2012 .

Key parameters:

  • Assay: 99.5 – 100.5%

  • Water (LOD): 0.00 – 0.10%

  • Heavy metals (sum): < 1 ppm

  • pH (1% solution): 3.5 – 3.8

  • Storage stability: 36 months under recommended conditions

This combination of purity and low moisture supports consistent performance in polymer processing.

Product datasheet – Monosodium citrate anhydrous (MSC): view

When Does Monosodium Citrate Make Sense in Polymer & Plastics?

Monosodium citrate is particularly relevant when:

  • A non-toxic blowing agent is preferred
  • Food-contact compliance is required
  • Clean CO₂ release is important
  • Equipment corrosion must be minimized
  • Fine cell morphology at low loading is needed
  • A reliable Monosodium Citrate supplier in Europe is required

Why Choose Citribel as Your Monosodium Citrate Manufacturer?

Citribel is a long-established Monosodium Citrate supplier and manufacturer in Europe, offering:

European Manufacturing

Produced in Belgium using controlled surface fermentation with Aspergillus niger.

Upcycled & Circular Production

Fermentation-based manufacturing from agricultural feedstocks supports circular value chains.

Reliable Monosodium Citrate Bulk Supply

  • Industrial-scale production
  • Defined particle size control
  • Long-term stability (36 months under recommended storage)
  • Full regulatory documentation

For companies seeking a European Monosodium Citrate manufacturer with consistent quality and traceable production, Citribel provides long-term partnership reliability.

Frequently Asked Questions – Monosodium Citrate in Polymer & Plastics

What is monosodium citrate used for in polymer processing?

Monosodium citrate can be evaluated as an endothermic chemical blowing agent in selected thermoplastic systems. Upon decomposition, it releases carbon dioxide and water, which may support density reduction and foam structure development in plastics.

Monosodium citrate decomposes at approximately ±217 °C. The reaction is endothermic, meaning it absorbs heat during gas release, which contributes to improved processing stability in extrusion and injection molding.

Monosodium citrate may be evaluated in polyolefins such as PE and PP when processing temperatures are compatible with its decomposition onset. Suitability should always be confirmed in the target formulation and process conditions.

Compared to free citric acid, monosodium citrate has lower acidity. Depending on the formulation and process conditions, this may help reduce the risk of long-term equipment wear.

Yes. Citribel produces monosodium citrate in Belgium through controlled fermentation using Aspergillus niger and supplies industrial customers internationally.

Yes. Citribel supplies monosodium citrate in bulk quantities, including powder and granular grades for industrial applications.

Particle size can influence dispersion, decomposition uniformity and foam morphology. Fine monosodium citrate powder is often preferred where homogeneous melt blending or masterbatch production is required.

Monosodium citrate may be evaluated in starch-based thermoplastics and other bio-based polymers where controlled gas release is required. Performance should be validated in the intended polymer system.

Optimal loading levels depend on the polymer type, processing conditions and the targeted density reduction. Application testing is recommended to determine the right dosage.

Packaging options

Commercial name
Reference
Available packaging
Compendia Compliance
Monosodium Citrate Anhydrous Granular
04 12570
25 kg, 500 kg, 900 kg
DAC, JECFA, OU, H
Monosodium Citrate Anhydrous Powder
04 12562
25 kg, 500 kg, 900 kg
DAC, JECFA, OU, H

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