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Hondo Sodium Carboxymethyl Cellulose (CMC) is a key functional additive widely used in water-based paints and coatings, including latex paints, architectural coatings, and wood finishes.As a water-soluble cellulose ether, paint-grade CMC functions primarily as a thickener, rheology modifier, stabilizer, and water-retention agent, helping coating manufacturers achieve stable formulation performance, consistent application behavior, and long-term storage reliability.
With controlled degree of substitution (DS) and viscosity distribution, Hondo CMC is designed to meet the practical formulation requirements of modern water-based coating systems, especially those sensitive to shear, temperature, and pigment loading.

Function-Hondo CMC for Paint Industry

Hondo Sodium Carboxymethyl cellulose (CMC) is an important additive in the painting industry, used to improve the rheological properties, suspension stability and application performance of paints and coatings. Its water solubility, film forming ability and compatibility with a wide range of formulation ingredients make it an essential ingredient in both water- and solvent-borne coatings.From a formulation-engineering perspective, CMC works by forming a hydrated polymer network in the aqueous phase, which provides viscosity build-up at low shear while maintaining flow under application shear. CMC for paints and costings can effectively increase the viscosity and thixotropy of the paint, improve the brush ability and leveling property during construction, prevent the pigment from settling or separating in the paint during storage. Meanwhile, Cellulose CMC has excellent water retention properties, which helps the paint film dry evenly and reduces the occurrence of cracking. This controlled water-retention behavior is particularly important for high-pigment or fast-drying systems, where uneven evaporation often leads to surface defects.Moreover,sodium carboxymethyl cellulose for paint industry improves the workability of paint, making it easier to apply while reducing waste and improving cost efficiency.

Application

1. Construction Painting & Coating

Hondo CMC can be used in interior wall latex paints and exterior wall paints, it can enhance the storage stability and construction fluidity, meet the coating requirements under different climatic conditions, provide a good construction consistency and anti-sagging property, prevent sedimentation, and improve the fineness of the coating film.In architectural coatings, CMC helps formulators balance anti-sagging performance and open time, ensuring stable application under different climate and humidity conditions.
2. Industrial Protective Paints

CMC for paint industry can effectively prevent sedimentation and caking, and enable a large number of functional pigments (such as zinc powder, aluminum powder, mica iron oxide, etc.) remain uniformly dispersed for a long time. It enhances the durability of the coating in anti-corrosion and wear-resistant coatings, and is suitable for the surface protection of mechanical equipment, ships and other fields.For heavy-pigment systems, CMC improves long-term pigment suspension, reducing re-dispersion time before application and minimizing formulation inconsistency during storage and transport.
3. Children's Environmentally Friendly Wall Paints

Sodium Carboxymethyl Cellulose - CMC for the paints industry is of natural origin, non-toxic and non-irritating, and completely free of harmful volatile substances (VOCs), meeting the requirements of high environmental protection standards. At the same time, Na-CMC has excellent thickening and rheological adjustment properties, which can improve the construction feel and leveling property of the paint, and help to form a fine, smooth, uniform and dense paint film.This makes CMC especially suitable for low-odor, low-emission, child-safe interior coatings, where both application safety and film appearance are critical.
4. Other Paint Products

Water-based Wood paints: sodium CMC in paints and coatings has excellent water retention properties, which can slow down the evaporation rate of water in water-based wood paint, improve the film-forming leveling property, and enhance the surface gloss and uniformity.

Water-based Fire-retardant Paints / Functional Coatings: CMC assists in cementing, thickening and stabilizing the functional components, and improves the construction consistency.

Colored Waterproof Coatings: painting used CMC improves water retention and thick coating properties during construction, and prevents problems such as cracking and powdering.Across these applications, CMC provides a cost-effective rheology solution without negatively affecting film clarity, adhesion, or pigment development.

Applications / Solutions for Painting used CMC

Poor Viscosity Control in Water-Based Paints

Problem: Water-based paints often suffer from sagging and poor leveling during application.
Solution: CMC for paint acts as an effective rheology modifier, improving viscosity stability, sag resistance, and smooth brush or roller application.

Pigment Settling During Storage

Problem: Heavy pigments tend to settle, causing color inconsistency and reduced shelf life.
Solution: Carboxymethyl cellulose enhances suspension stability by increasing low-shear viscosity, keeping pigments evenly dispersed during storage and transport.

Rapid Drying and Film Cracking

Problem: Fast water evaporation leads to cracking and poor film formation, especially in exterior coatings.
Solution: CMC improves water retention, slowing drying speed and ensuring uniform film formation and stronger adhesion.

Performance Issues in Low-VOC Paint Formulations

Problem: Low-VOC and eco-friendly paints often lack body and application stability.
Solution: CMC provides efficient thickening and anti-sag performance without VOC contribution, supporting stable and environmentally compliant coating formulations.

Advantage

1. Thickening and rheological control

Hondo CMC serves as an outstanding thickening and rheology modifier, ensuring consistent viscosity throughout storage and application. CMC for paint industry has excellent shear-thinning properties. It becomes thinner during brushing and spraying, and can quickly regain viscosity after construction. CMC can also accurately adjust the viscosity of the paint according to different paint formulations and construction requirements.Its predictable shear-thinning behavior allows precise viscosity tuning, which is critical for brushing, rolling, and spraying processes.

2. Stable Suspension & Superior Pigment Dispersion

Sodium CMC builds a network structure in water-based paints that stabilizes pigments, titanium dioxide, and extenders, effectively preventing settling or aggregation during long-term storage. Whether for colored paints or high-solid formulations, CMC cellulose maintains suspension integrity and enhances formulation reliability across the product lifecycle.This network structure reduces density-driven sedimentation, helping maintain batch-to-batch consistency for commercial paint production.

3. Construction performance optimization

Hondo CMC powder can effectively control viscosity changes, prevent sedimentation and caking, adjust the rheology of paint, improving the decorative effect. CMC in painting industry can help to reduce the brush marks, improving the surface smoothness, and it can synergistically enhances the abrasion resistance, water resistance, and adhesion of the paint film, making it suitable for industrial protective painting with high mechanical strength requirements.This results in smoother surface appearance, reduced brush marks, and improved film uniformity after drying.

4. Environmentally Friendly and Regulatory-Compliant

Hondo Sodium CMC is derived from natural cellulose sources and processed using environmentally responsible methods. According to test dataIt is non-toxic, biodegradable, and compliant with international environmental standards such as REACH and ROHS.It complies with REACH and ROHS requirements, making it suitable for export-oriented coating manufacturers.

CMC for Paint Industry Specification

Spec.	Standard
Appearance	White or yellowish powder
Moisture	≤10.0%
DS	≥0.80
Purity	Technical or high purity
pH	7.0～10.0
Viscosity (1% or 2% solution)	5-8000 mPa·s

Quality Control & Manufacturing Assurance

To ensure stable performance in paint formulations, Hondo Chem implements a complete quality control system:

Raw Material Control: Selected cellulose sources with controlled purity and ash content

Production Process Control: Reaction temperature, alkalization degree, and substitution uniformity monitored

Finished Product Testing: Viscosity, DS, pH, moisture, and solubility performance

Outgoing Inspection: Batch-specific COA, retained samples, and traceability records

Quality Assurance: Consistent batch performance for industrial coating applications

Why Choose Hondo CMC for Paint Industry?

Proven performance in water-based coating systems
Wide viscosity range for different paint formulations
Stable supply and batch consistency
Technical support for formulation optimization
Competitive cost-performance ratio for industrial buyers

Packing & Storage

Storage:

1. Carboxymethyl cellulose should store in a cool, dry, clean, ventilated environment. Temperature Max. 70℃, with relative humidity ≤80%.

Storage:

2. The CMC for pharmaceutical and food grade should not be put together with the toxic substance and harmful substance or substance with peculiar smell during transportation and storage.

Storage:

3. Since the date of production, a preservation period of sodium CMC should not exceed 4 years for the industrial product and 2 years for the CMC in pharmaceutical and food industry.

Storage:

4. The CMC should be prevented from water and package bag damaging during transportation.

Packing:

25kg kraft paper bag with PE inner, or as clients request.

product-2196-1618

Conclusion

With the increase in the market share of water-based paintings, CMC for paint industry used, with its properties of non-toxic, highly efficient and having multiple effect properties is gradually replacing traditional additives and becoming a key material for the upgrade formulation for painting industry. Hondo Sodium CMC plays an important auxiliary role in paint industries, especially the water-based paints. The applied research in emerging fields such as fast-drying paintings and high-solids coatings is also being accelerated.By selecting the appropriate viscosity and substitution grade, paint manufacturers can significantly improve formulation stability, application performance, and overall product quality.

FAQ

Q1: Can CMC replace HEC or HPMC in paint formulations?
CMC can partially replace other cellulose ethers depending on formulation goals, especially where cost control and suspension stability are priorities.

Q2: What viscosity grade should be selected for latex paint?
Viscosity selection depends on application method, pigment volume concentration (PVC), and shear conditions. Technical guidance is available upon request.

Q3: Is CMC suitable for high-pigment or high-solid paints?
Yes, properly selected CMC grades perform well in high-solid systems by maintaining suspension stability.

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