Plan a trial for your application
Reinforcement in compounded plastics
Hold resin, filler loading and molding direction constant. Compare flexural modulus, warpage and surface quality.
Coating extender pigments
Make panels at equal filler volume. Compare fineness, matting, settling resistance and application feel.
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 · Talc powder catalogue and specifications ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Moisture | % by mass | ENVO published HR8115, HR8318, HR8421, HR8519 all list ≤0.5 | Check the COA for the actual grade and confirm drying temperature and duration. |
| Particle size | µm | ENVO HR8519 listing: 10. | The listing does not identify a percentile. Obtain the full particle-size distribution before sample approval. |
| Iron oxide content | % by mass | ENVO HR8519 listing: 0.5. | Use for comparing mineral sources. Assess appearance separately on a finished-part colour sample. |
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
The catalogue lists 25 kg and 1,000 kg bags. Verify that unloading and dust collection equipment can handle the pack.
Storage and handling
Separate lots by mineral source and size grade. Request the size distribution and application-specific mineral impurity tests.
Sample and order lead times
Specify colour code, surface treatment or filler grade and whether a single lot is required. Confirm trial quantity, MOQ, retention across lots and arrival.
Questions from the plant
Why can similar-fineness talcs cause different part warpage?
Keep processing and cooling constant and compare warpage, shrinkage and surface defects.
Why do two “1250 mesh” talcs reinforce differently?
Request particle-size distributions, morphology and test methods. Compare in the same resin.
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 platelet diameter and thickness, Particle size distribution, mineral impurities.
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.