Quality Control
Batch-wise Lab Testing. Certificate of Analysis with Every Shipment.
Every production batch is tested against grade-specific specifications before dispatch. Buyers receive a Certificate of Analysis referenced to the batch number on their packaging.
Laboratory Setup
In-House Testing Capability
Our in-house laboratory is equipped with a laser particle size analyser, brightness meter, pH meter, and muffle furnace. These instruments allow us to test every batch internally without relying on external labs for routine parameters.
For full chemical composition analysis and periodic external verification, we work with accredited third-party laboratories. Third-party test reports are available to buyers on request for grade qualification or import documentation purposes.
All instruments are subject to regular calibration using certified reference standards. Calibration records are maintained and available for audit.
Parameters Tested
7 per batch (routine)
COA Format
Batch-specific PDF
Third-Party Available
On request
Calibration
Periodic, documented
In-house QC laboratory
* Stock image shown for illustrative purposes.
Quality Flow
Incoming Material
- Visual inspection of incoming rock for mineralogical consistency
- Random sample sieve test on incoming lot
- Moisture check before storage allocation
In-Process
- Periodic particle size checks during grinding
- Classifier setting verification and adjustment
- Screen integrity check before product bagging
Pre-Dispatch
- Full parameter testing on finished batch sample
- Comparison against grade specification card
- Batch approval sign-off before packaging begins
Documentation
- Certificate of Analysis (COA) generated per batch
- Batch number printed on each bag
- COA shared with buyer before or at time of dispatch
Test Parameters
What We Test and Why
Particle Size Distribution
Laser diffraction (D10, D50, D97)
Freq: Every batch
Instrument
Laser particle size analyser
Why It Matters
Core specification for most industrial applications. Determines grade classification and functional performance in formulations.
ISO Brightness
TAPPI T452 / ISO 2470
Freq: Every batch
Instrument
Digital brightness meter
Why It Matters
Critical for paint, paper, and plastics applications where whiteness affects product aesthetics and hiding power.
Moisture Content
Loss on drying at 105°C for 2 hours
Freq: Every batch
Instrument
Muffle furnace + analytical balance
Why It Matters
Excess moisture causes flowability issues and affects weight-based billing accuracy. Controlled below grade-specific limits.
pH Value
10% aqueous suspension at 25°C
Freq: Every batch
Instrument
Calibrated pH meter
Why It Matters
Determines compatibility with polymer matrices and aqueous formulation systems. pH out of range can affect processing.
Loss on Ignition (LOI)
Muffle furnace at 900°C for 1 hour
Freq: Per product family (routine)
Instrument
Muffle furnace
Why It Matters
Indicates carbonate content in CaCO₃ and dolomite. Used to verify chemical purity and detect adulterants.
Oil Absorption
Spatula rub-out method (ASTM D281)
Freq: Per grade (periodic)
Instrument
Manual measurement
Why It Matters
Determines binder demand in paint and ink formulations. Affects gloss, film formation, and pigment loading.
Chemical Composition
XRF / Wet chemical analysis
Freq: Per grade qualification
Instrument
XRF spectrometer / wet lab
Why It Matters
Confirms CaCO₃, SiO₂, Al₂O₃, Fe₂O₃ levels. Used for grade qualification and addressing buyer specification sheets.
Certificate of Analysis
Documentation with Every Dispatch
A batch-specific Certificate of Analysis is prepared for every dispatched lot. The COA includes the production date, batch number, grade code, and tested values for all routine parameters.
The batch number on the COA corresponds to the number printed on each bag, enabling full traceability from the lab report to the physical product received.
Request a Sample COA →COA Fields (Typical)