Plan a trial for your application
Nappa garment leather
At equal active content, compare softness, fullness and loose grain.
Upholstery or automotive leather
Compare heat aging, migration and compatibility with the surface finish.
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. TFL CORIPOL AV · Fatliquoring in leather wet processing ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Active matter or nonvolatile content | % by mass | Agree for the grade and end use | Distinguish the oil phase from total dry matter. |
| Emulsion stability | Observation or separated volume | Agree for the grade and end use | Specify hardness of the process water, pH and temperature. |
| Finished leather softness | Instrument value or rating | Agree for the grade and end use | Sample from the same hide area, condition the pieces and assess blind. |
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
Receive drums by oil system, net weight and batch. Do not store grades of different ionic character as one material.
Storage and handling
Agree the temperature range and whether a separated product may be rehomogenised. Request post-storage retest conditions.
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 is the leather soft but spotted with oil?
Compare corresponding hide areas. Check penetration, fatliquor uptake and migration during drying.
Why can equal tonne prices produce different actual costs?
Convert product weight to active matter, then calculate cost per area of finished leather.
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 Active matter or nonvolatile content, Emulsion stability, Finished leather softness.
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.