Name: Sodium CMC Thickener 7H4F
Brand: Coatingsink
SKU: sodium-cmc-thickener-7h4f
Availability: InStock

Question 1

How is the viscosity of Sodium CMC 7H4F measured and what does the 7H4F grade designation mean?

Accepted Answer

Viscosity is measured on a 1% aqueous solution at 25°C using a Brookfield LVT viscometer at 20 rpm, yielding approximately 4000 mPa·s. The '7H' prefix denotes high-viscosity grade and '4F' refers to the particle fineness class, indicating a fine-mesh powder that dissolves rapidly without fish-eyes.

Question 2

At what addition level is Sodium CMC 7H4F used in water-based adhesive formulations?

Accepted Answer

Typical loading is 0.5–2.0% on total formulation weight. For PVA-based paper adhesives and starch pastes, 0.8–1.2% is common to achieve application viscosity of 8,000–15,000 mPa·s. Pre-disperse in cold water under agitation before heating to 60–80°C for full hydration.

Question 3

Is Sodium CMC 7H4F compatible with PVA emulsions and starch in co-binder systems?

Accepted Answer

Yes. CMC 7H4F is fully compatible with PVA homopolymer and copolymer emulsions as well as native and modified starches. It extends open time, improves water retention on porous substrates, and contributes to dry bond strength without compromising emulsion stability at normal formulation pH (5–9).

Purity	≥99.5%
Moisture Content	≤10%
pH (1% solution)	6.5–8.5
Degree of Substitution (DS)	0.7–0.9
Viscosity (1%, 25°C, Brookfield)	4000 mPa·s

Sodium CMC Thickener 7H4F

Specifications

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