Water-based paints and coatings rely on thickeners to achieve the right application viscosity, prevent pigment settling, and ensure smooth brush or roller application. Among the available thickener families — acrylic emulsions, associative thickeners, and cellulose ethers — Hydroxyethyl Cellulose (HEC) remains one of the most widely used rheology modifiers in the coatings industry.
Michem Chemical supplies HEC specifically positioned for paints, coatings, and industrial applications. This guide walks through HEC’s role in water-based coating formulations, presents the verified Michem HEC grade range, and provides practical guidance on dissolution, compatibility, and grade selection.
According to the Michem HEC product page, Hydroxyethyl Cellulose is a non-ionic, water-soluble cellulose ether derived from natural cellulose through chemical modification. It is described as an odorless, white or light yellow powder known for its:
These properties make HEC a versatile thickener, stabilizer, emulsifier, and suspending agent across multiple industries.
All data below is taken directly from the Michem HEC product page.
| Parameter | Specification |
|---|---|
| CAS Number | 9004-62-0 |
| Appearance | White or off-white powder |
| Moisture | ≤5% |
| Ash | ≤5% |
| Solubility | Water soluble |
| pH Value | 6–8 |
| Viscosity Range | 1,500–8,500 mPa·s (Brookfield LV, 1% solution) |
| Biostability / Enzyme Resistance | Yes |
| OEM Customization | Available |
| Grade | Viscosity Range | Product Advantages |
|---|---|---|
| HE30KB | 1,500–2,500 mPa·s | Enhances emulsion stability; improves fluidity & capabilities |
| HE60KB | 2,500–3,500 mPa·s | Good solubility, easy to use & flexible formulation design |
| HE100KB | 3,500–6,500 mPa·s | Excellent viscosity stability & water retention |
| HE150KB | 6,500–8,500 mPa·s | Efficient thickening ability; good fluidity properties |
Source: michemicals.com
The Michem product page highlights several properties that are directly relevant to paint and coating formulations:
| Property | Relevance to Paints & Coatings |
|---|---|
| pH Stability (2–12) | Compatible with both acidic and alkaline coating systems — from acidic latex paints to alkaline cementitious coatings |
| Thickening Effect | Provides viscosity and flow control for consistent application |
| Water Retention | Improves open time and reduces premature drying during application |
| Excellent Compatibility | Works well with other formulation ingredients (pigments, binders, coalescents) |
In water-based architectural paints (acrylic, vinyl acetate, and styrene-acrylic emulsions), HEC serves several critical functions:
Rheology control — HEC builds the mid-to-high shear viscosity needed for good brush/roller pick-up and film build, while also providing low-shear viscosity to prevent sagging on vertical surfaces.
Pigment suspension — The thickening effect keeps pigments and extenders (TiO₂, calcium carbonate, kaolin) uniformly suspended during storage, preventing hard settling.
Application performance — Proper viscosity ensures smooth application without splatter, roller marks, or excessive drag.
Storage stability — HEC’s enzyme resistance (biostability) helps maintain viscosity consistency over the paint’s shelf life, resisting the microbial degradation that can cause viscosity loss in cellulose-thickened paints.
Interior flat paints typically require moderate viscosity with good flow and leveling. The goal is a smooth finish without brush marks.
Recommended starting grade: HE30KB or HE60KB
Exterior paints face more demanding conditions: UV exposure, rain, temperature cycling, and biological growth. Higher viscosity grades provide better sag resistance on vertical surfaces and improved water retention during curing.
Recommended starting grade: HE100KB
High-build coatings, textured finishes, and elastomeric coatings require efficient thickening at higher viscosity targets to support heavy pigment loads and thick film application.
Recommended starting grade: HE150KB
The Michem product page provides a direct comparison between HEC and CMC that explains why HEC is preferred for coating applications:
| Comparison Point | HEC | CMC |
|---|---|---|
| Ionic character | Non-ionic | Anionic |
| Electrolyte systems | Performs better in high-electrolyte systems | Limited |
| pH stability | Stable pH 2–12 | Limited to pH 5–9 |
| Film clarity | Produces clearer films | Less clear |
Source: michemicals.com
For water-based paints, these differences are significant:
The Michem product page provides specific guidance on dissolving HEC effectively — a critical step in paint manufacturing:
“Add HEC powder slowly to vortex of agitated water (not vice versa)”
This is the standard method for most paint production. Adding HEC slowly to the vortex of vigorously agitated water ensures individual particles wet out and hydrate separately, preventing lump formation.
“Disperse HEC in 1/5 of total water at 80–90°C”
In this method, HEC is first dispersed in a small portion of hot water (80–90°C). The HEC does not dissolve in hot water but disperses evenly as a slurry. When the remaining cold water is added, the temperature drops and the HEC hydrates and dissolves uniformly. This method is useful for formulations where rapid dissolution is needed.
The Michem product page lists the following quality control tests performed on HEC:
These QC procedures are particularly important for paint manufacturers who need batch-to-batch consistency to maintain stable viscosity in their finished products.
| Container Type | Pallet Load | Pallet Quantity | Maximum Total Weight |
|---|---|---|---|
| Small container 20 GP | 500–600 kg/pallet | 20 pallets | 12 tons |
| Big container 40 HC | — | 40 pallets | 24 tons |
Source: michemicals.com
While this article focuses on water-based paints and coatings, the Michem product page lists HEC’s applications across multiple industries:
The Michem product page emphasizes that the company does not treat orders as one-time transactions:
“Michem’s R&D team can customize viscosity curves for you and even assist in optimizing your formulation system.”
For paint manufacturers, this means:
The CAS number is 9004-62-0, as confirmed on the Michem product page. This unique chemical identifier is essential for regulatory documentation and safety data sheets (SDS).
According to the Michem product page, HEC is generally recognized as safe (GRAS).
HEC is non-ionic while CMC is anionic. HEC performs better in high-electrolyte systems, is stable across pH 2–12 (vs CMC’s pH 5–9), and produces clearer films. HEC is preferred for applications requiring electrolyte compatibility and optical clarity.
Add HEC powder slowly to the vortex of agitated water (not vice versa). Use fine mesh grades (80–100 mesh) for faster dissolution. Start with cold water (15–25°C) and heat after hydration. Alternatively, disperse HEC in 1/5 of total water at 80–90°C before adding the remaining cold water.
For interior flat paints: HE30KB or HE60KB. For exterior coatings: HE100KB. For high-build industrial coatings: HE150KB. Request free samples from Michem to test in your specific formulation.
The dry-mix plaster has a shelf life of 6–12 months when stored dry. Calcium formate itself has a shelf life of 12 months. The limiting factor for the plaster is usually the gypsum (which can partially rehydrate during storage) and the HPMC, not the calcium formate.
Hydroxyethyl Cellulose remains a cornerstone thickener for water-based paints and coatings due to its non-ionic nature, wide pH stability (2–12), enzyme resistance, and excellent compatibility. Michem’s HEC range — HE30KB through HE150KB — covers the full viscosity spectrum needed by paint formulators, from low-viscosity interior flats to high-build industrial coatings.
For paint manufacturers seeking a reliable HEC supplier with customization capabilities, Michem offers not just product but partnership: R&D support for viscosity curve customization, formulation optimization assistance, and free samples with batch stability reports.
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