Plan a trial for your application
Latex paint thickening
Prepare samples in the same latex with controlled shear and hydration time. Measure low-shear viscosity and application leveling separately.
Waterborne dispersion
Use the site’s feeding and mixing equipment. Record the time required for a particle-free dispersion.
Purchase specifications and incoming inspection
Include the intended grade or current specification in the enquiry. Use the table to compare selection criteria and inspection conditions. The specification agreed by both parties defines the contractual limits. ENVO · Hydroxyethyl Cellulose (HEC) catalogue and specifications ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Apparent density | g/mL | ENVO reference range: 0.35–0.61. | Specify loose or tapped density and the filling procedure. Confirm the viscosity grade separately. |
| Solution viscosity | mPa·s | Agree for the target HEC grade. | Record solution concentration, water temperature, spindle and rotational speed. |
| Time to complete dispersion | min | Confirm at actual feeding conditions. | Fix mixing, solution pH and order of addition. Check for visible lumps and a stable viscosity. |
When approving a sample, record the grade, methods, limits and specification revision. On receipt, match the packing lot number to the lot-specific COA and record the measured values and release decision.
From samples to commercial delivery
Packaging and receiving
Published net weight is 25 kg per bag. Require a clearly marked viscosity grade and check for moisture-related lumps.
Storage and handling
Retain an unopened sample identified by lot. Record concentration and water temperature used in the supplier’s viscosity method.
Sample and order lead times
State processing equipment, trial batch size and monthly demand. Confirm same-grade samples, first-order MOQ, staged deliveries and arrival date.
Questions from the plant
What causes initial lumps or a lower final viscosity?
Record powder dispersion, hydration time and test temperature. Compare viscosity only after stabilisation.
Why does a paint sag on vertical surfaces despite an acceptable bench viscosity?
Test sag and levelling at the same film thickness. Check viscometer speed and rest time before the reading.
Report a delivery or batch issue
Include the order number, lot number from the package, label photos and inspection records for the affected lot. When retesting, check viscosity test concentration, substitution characteristics, Surface treatment.
Request documents for your application
TDS · Technical data sheet
For grade selection and sample approval, specify the grade and revision required.
SDS · Safety data sheet
Specify the country or region of use and the required language.
COA · Certificate of analysis
Request a sample COA during supplier review. For incoming inspection, provide the actual lot number.