CMC-N Viscosifier & Fluid-Loss ReducerNPT-CMC-N
A sodium CMC viscosifier and fluid-loss reducer — a small addition sharply raises viscosity and yield point and builds a low-permeability cake on the wall.
Product Overview
One-liner: A little goes a long way, A sodium CMC viscosifier and fluid-loss reducer — a small addition sharply raises viscosity and yield point and builds a low-permeability cake on the wall.
CMC-N is high-substitution sodium carboxymethyl cellulose. Its chains uncoil in water to sharply raise slurry viscosity and yield point while lowering fluid loss through a low-permeability filter cake — widely used to boost cuttings carry and wall protection in pebble, boulder and complex ground.
Strong viscositying
A 2% solution reaches ≥ 800 mPa·s — a small dose is enough.
Fluid-loss control
Builds a low-permeability cake that visibly cuts fluid loss.
Salt tolerant
Viscosifying effect stays stable in saline slurries.
Applicable Strata / Scenarios
| Strata type | Typical scenario | Recommended ratio | Expected effect |
|---|---|---|---|
| Pebble | Cuttings carry | 0.3%–0.5% | Less sediment |
| Boulder | Percussion slurry | 0.3%–0.5% | Stable wall |
| Complex ground | Compound conditioning | 0.2%–0.4% | Lower fluid loss |
| Rock | Seepage & loss control | 0.2%–0.3% | Tight filter cake |
Technical Data Sheet
Quantified core indices for product selection and tender comparison; a test report ships with every batch.
| Test item | Specification | Test method |
|---|---|---|
| Appearance | White to slightly yellow powder | Visual |
| Viscosity (2% solution) | ≥ 800 mPa·s | Rotational viscometer |
| Degree of substitution | ≥ 0.7 | Titration |
| Moisture | ≤ 10.0% | Oven drying |
| Purity | ≥ 95.0% | Calculation |
| pH (2% solution) | 6.5–8.5 | pH meter |
How to Use / Mix Design
| Step | Key points | Reference dosage |
|---|---|---|
| Pre-dissolve | Dissolve in warm water before adding to the mud system | 0.2%–0.5% |
| Add | Sprinkle slowly while stirring to avoid lumps | In portions |
| Compound | Blend with bentonite or polymer slurries for extra effect | As required |
| Maintain | Top up according to fluid-loss readings | Per test results |
Related Solutions
01Sand Strata Construction Solution
A full material and process package from mix design to loss control, holding surface settlement under 3 mm in water-rich sand.
02Pebble Strata Construction Solution
High-carry mix designs and hole-control measures for the large cuttings and unstable walls of pebble strata.
03Complex Strata Solution
A compound mix design for saline, hot-humid and interbedded ground, keeping long-circulation slurry performance stable.
Related Cases
South · Industrial plantsHot-humid, saline-groundwater piles in South China: 72 h stable
A coastal plant foundation in South China hit 35‰ saline groundwater and hot, humid weather. The slurry flocculated out within 4 hours, forcing three slurry changes per shift with heavy idle time.
Project scaleCoastal industrial plant piles in 35‰ saline groundwater and hot, humid conditions
Northwest · Bridge pilesBoulder-strata pile walls in Northwest China: 98% wall stability
A bridge foundation in Northwest China crossed boulder beds. Large stones violently disturbed the walls — collapse and spalling were frequent, and heavy waste slurry forced constant pond clean-outs.
Project scaleBridge piles through boulder beds with large stones and severe wall disturbance
Overseas · Port worksSeawater-ground slurry flocculation: 28% less bentonite
An overseas port project mixed slurry with seawater at about 32‰. Conventional mud flocculated out in the salt and could not form a film on the wall; bentonite consumption was high and remote resupply pushed costs up.
Project scaleOverseas port piles mixed with seawater at about 32‰ salinity
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