Plan a trial for your application
Injection-molded housings
With the same mold and process, compare filling, warpage, notched impact and stiffness.
Sheet and transparent packaging
At target thickness, compare haze, forming window and seal performance.
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. INEOS · Polypropylene grades and applications ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Melt flow rate | g/10 min | Confirm against the offered grade and purchase specification | Align temperature, load and method before comparing results. |
| Flexural modulus | MPa | Confirm against the offered grade and purchase specification | Check specimen preparation and conditioning. |
| Notched impact strength | kJ/m² or J/m | Confirm against the offered grade and purchase specification | Specify method, notch type and test temperature. |
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 bag label should identify homopolymer or copolymer and the grade. Check coloured particles, fines and additive declarations.
Storage and handling
Keep separate parts if masterbatch or regrind proportion changes, so that the change is not mistaken for lot variation.
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
Will increasing melt flow index also prevent cold cracking?
Melt flow describes processing flow. Check impact at the same temperature and test the fabricated part.
Can transparent and impact grades be exchanged on density alone?
Check copolymer structure and clarity target, then trial the mould and finished part.
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 Melt flow rate, Flexural modulus, Notched impact strength.
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.