A filler masterbatch producer buying calcium carbonate needs to qualify the powder in two places: on the compounding line and in the converter’s finished product. A pellet that runs well through the extruder still has to meet the film, tape or moulded part specification at the buyer’s intended let-down rate.
Start with the carrier and end use
Identify the carrier resin, target mineral loading in the concentrate and intended let-down rate. These percentages describe different things. For example, dosing 10% of a masterbatch that contains 80% calcium carbonate contributes 8% mineral to the finished blend by weight, assuming there are no other mineral sources. This is a calculation example. Choose the actual loading through a production trial.
Compare the full particle-size specification
Ask for the particle-size distribution and test method. D50 describes the median on the stated measurement basis. D97 describes the size below which 97% falls on that basis. Two grades with a similar median can have different coarse tails. When comparing suppliers, check the measurement method and units before treating their values as equivalent.
For coated ground calcium carbonate (GCC), ask about surface treatment, moisture and the packing used for the trial lot. Separate typical data-sheet values from agreed acceptance limits. Ask the supplier to identify which properties appear on each shipment’s certificate of analysis.
Run the comparison on the intended product
Keep the resin, additives, mineral loading and machine settings consistent for the first comparison. Record throughput, screen changes, pressure and any visible agglomerates. Then evaluate the finished article at the intended let-down rate. For raffia tape that could mean tape breaks during drawing and tensile performance. For film it could mean visible defects and the properties specified by the customer.
Request an Egyptian GCC sample or quotation
Compare Carbocore’s coated and uncoated calcium carbonate grades and technical data sheets. To request a sample or export quotation, send the carrier resin, application, reference specification, trial quantity, preferred packing and destination port. The export team can also be reached at export@carbocoregcc.com.
