Plan a trial for your application
Waterborne paint preparation
At fixed shear and standing time, compare foam height, density and film cratering.
Roll or dip coating
Prepare panels at actual line speed and inspect for microbubbles, pinholes and surface gloss.
Purchase specifications and incoming inspection
Use these properties to compare grades within the product family. Example figures refer to the cited grade or source. Confirm the offered specification, packaging and lead time in the quotation. Evonik TEGO Foamex 825 · Defoamer emulsion ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Defoaming rate | s | Agree for the grade and end use | Record the time for the foam layer to reach the specified height. |
| Active matter or solids | % by mass | Agree for the grade and end use | Identify the emulsion or concentrate form. |
| Film defects | count per specified area | Agree for the grade and end use | Count under the same lighting and at the same wet film thickness. |
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
Distinguish emulsion and oil grades. Confirm net weight and whether gentle homogenisation is required.
Storage and handling
For emulsions specify temperature range and freeze-thaw requirements. Use the same addition point for sample and commercial trials.
Sample and order lead times
Compare quotations by active matter, as-supplied net weight and packaging. State destination and receiving facilities and request MOQ, sample dispatch and commercial arrival dates.
Questions from the plant
Why did craters appear after foam was reduced?
Trial a lower dose and a different addition stage. Recheck compatibility in the same base.
Why do pinholes appear on line when a standing beaker shows no foam?
Add a high-shear circulation or simulated roller trial. Compare release of fine bubbles.
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 Defoaming rate, Active matter or solids, Film defects.
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.