Stearic acid coated · PVC extrusion grade
Activated Calcium Carbonate
Coated calcium carbonate, surface treated with stearic acid, for high-load filling in rigid PVC. The coating keeps it hydrophobic, so it disperses cleanly and does not choke the machine.
Typical values
| Particle size (D50) | 2.0 – 2.5 microns |
|---|---|
| Surface treatment | 1.0% – 1.2% stearic acid coating |
| Whiteness / brightness | 95% minimum |
| CaCO₃ content | 98.5% minimum |
| Moisture content | 0.15% maximum |
| Oil absorption | 16 – 18 ml / 100 g |
These are typical values from regular production, not a contractual specification. A Certificate of Analysis can be arranged on request — tell us at the enquiry stage. If you need a tighter window on any parameter, ask us before ordering and we will confirm what is achievable.
Supply & packing
| Minimum order | 1 tonne (20 bags × 50 kg) |
|---|---|
| Packing | 50 kg HDPE woven sacks, inner LDPE liner |
| Availability | Despatched direct from the plant |
| Monthly capacity | 300 tonnes |
Pricing is quoted against your monthly contracted tonnage and delivery location. Send us the grade and quantity and we will come back with a landed price.
Applications
Where it is used
PVC pipes & fittings
Takes maximum filler loading without losing tensile strength or spiking extruder torque.
uPVC profiles & conduits
Improves surface finish, gloss and impact resistance on extruded profiles.
Masterbatch compounding
A functional extender with dispersion good enough to run at high let-down ratios.
Cables & wire sheathing
Holds insulation properties and structural integrity in PVC sheathing.
On your floor
What it changes
- Cuts raw material cost per tonne by displacing virgin resin
- Reduces extruder screw and barrel wear
- Increases line output speed
- Hydrophobic coating prevents moisture pickup and machine choking
Also known as
Coated calcium carbonate · Stearic acid coated calcium carbonate · Activated limestone powder · PVC filler powder
Something misbehaving on the line? See processing problems and what usually causes them.
Choosing between the two
Activated or ground?
Both are calcium carbonate. The difference is the stearic acid coating, and it decides more than the price per tonne.
Activated — coated
| Reach for it when | The compound goes through an extruder as rigid PVC and you are pushing filler loading up. |
|---|---|
| What the coating does | Stearic acid makes the particle hydrophobic, so it disperses instead of agglomerating and does not carry moisture into the melt. |
| Typically | Pipe and fittings, uPVC profile, cable sheathing. |
| The trade-off | Costs more per tonne than uncoated. |
Ground — uncoated
| Reach for it when | You are filling for bulk and cost per tonne, and the formulation does not need the surface treated. |
|---|---|
| What does the work | Nothing sits between the calcite and the polymer — whiteness and particle size carry it. |
| Typically | Filler masterbatch, paints and putties, EVA footwear, moulded rubber. |
| The trade-off | Picks up moisture in storage and disperses less readily at high loading. |
Rule of thumb: through an extruder as rigid PVC, start with activated. In for bulk and whiteness, start with ground. If you are between the two, send the formulation and the line speed and we will tell you which one we would run — see Ground Calcium Carbonate.
Send us the grade and the tonnage. We will send the sample.
Free samples reach most plants in Telangana & Andhra Pradesh within 72 hours. For activated calcium carbonate we send a free 25 kg commercial trial batch — enough to run on the machine, not just look at.