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| Parameter | Typical Value |
|---|---|
| Product Grade | Arosha CC-800C |
| Mesh Size | 800 Mesh (approx. 18 µm top cut) |
| Coating Agent | High-purity Stearic Acid |
| Coating Percentage | 1.0 ± 0.2 % |
| Brightness (R457) | ≥ 95.5 % |
| D50 (Laser) | 5.0 – 6.5 µm |
| D97 (Laser) | ≤ 18 µm |
| Moisture | ≤ 0.3 % |
Established in 2005, Arosha Powder is a direct from mine manufacturer of Coated Calcium Carbonate 800 Mesh surface-treated with pharmaceutical-grade stearic acid for superior hydrophobicity, controlled oil absorption, and immediate dispersion in rigid PVC, masterbatch, and engineering polymer systems. Operating four exclusive limestone mines with unrestricted supply capacity, and ISO 9001:2015 certified production facilities, every metric ton is tested to D97 ≤ 18 µm and activation degree ≥ 98% before leaving our plant. Trusted by industrial manufacturers across 20+ countries. Export-ready from Iran.
This specific grade is purpose-built for processors who require ultra smooth surface finish, high gloss, and maximum filler loading in thin-wall extrusions, premium white masterbatch, and high-performance WPC. By grinding high-brightness Iranian limestone to a tighter top cut than 600 mesh and then applying a dry stearic acid coating in a high-speed mixer, we create a hydrophobic surface that eliminates agglomerates even at elevated loading levels. The coating level and activation degree are monitored batch-wise, guaranteeing that every consignment disperses instantly in the polymer matrix, minimizing torque and energy consumption on your extrusion lines while preserving impact strength and surface aesthetics.
When your formulation demands micron-level dispersion, superior mechanical properties, and flawless surface finish, Arosha Powder’s 800 mesh coated calcium carbonate delivers unmatched consistency from the mine to your silo. Our stearic acid coating is chemically bonded, not just physically blended, ensuring zero segregation during pneumatic conveying and perfect flowability even after months of storage.
Proven in: Thin-wall UPVC pipes, premium white masterbatch, WPC decking, automotive TPO compounds, and high-solids industrial coatings.
| Property | Specification | Test Method |
|---|---|---|
| Product Grade | Arosha CC-800C | – |
| Mesh Size | 800 Mesh (D97 ≤ 18 µm) | Laser Diffraction (Malvern) |
| CaCO₃ Content | ≥ 98.5% | XRF / ISO 3262 |
| MgCO₃ | ≤ 0.8% | XRF |
| Mean Particle Size (D50) | 5.0 – 6.5 µm | Laser Diffraction (Malvern) |
| Top Cut (D97) | ≤ 18 µm | Laser Diffraction |
| Residue on 325 Mesh (45 µm) | ≤ 0.01% | Wet Sieving (ASTM D1199) |
| Brightness (R457) | ≥ 95.5% | Spectrophotometer |
| Yellowness Index | ≤ 1.5 | ASTM E313 |
| Oil Absorption | 19 – 21 g/100g | ISO 787-5 |
| Coating Agent | High-purity Stearic Acid (vegetable-based) | – |
| Coating Percentage | 1.0 ± 0.2% | In-house titration |
| Activation Degree | ≥ 98% | Solvent extraction / FTIR |
| Moisture | ≤ 0.25% | Loss on drying, 105°C |
| Bulk Density (loose) | 0.85 – 0.95 g/cm³ | – |
| pH | 8.5 – 9.5 | ISO 787-9 |
Full TDS and SDS documents available upon request. Lot-specific certificates issued with each shipment.
An 800 mesh base powder (median particle size ~6 µm, top cut ~18 µm) is already ultrafine. But without surface treatment, the high surface energy of calcium carbonate causes immediate agglomeration in non-polar polymers like polyethylene, polypropylene, and PVC. Our coating process goes far beyond simple blending:
Reactive coating: Stearic acid reacts with the calcium carbonate surface in a high-speed pin-mill coater to form a monolayer of calcium stearate in situ, chemically bonded to each particle. This is not a physical mixture — the coating cannot be rubbed off during conveying.
Hydrophobic conversion: The coated surface repels moisture completely, preventing clumping during storage and ensuring free-flowing handling in automatic dosing systems — even in humid coastal climates.
Activation control: We measure coating efficiency via activation degree on every batch. Our target of >98% means virtually every particle is fully encapsulated, leaving no bare spots that would cause agglomeration or moisture pickup.
No free stearic acid leakage: Over-coating leads to die build-up, plate-out, and surface defects in extrusion. We precisely dose stearic acid based on real-time BET surface area measurement of the base powder, not an assumed average — zero free acid migration.
The result: Our 800 mesh coated product consistently reduces compound viscosity, allows higher filler loading, and maintains — often improves — impact strength compared to coarser or poorly coated alternatives.
| Performance Factor | Uncoated 800 Mesh | 600 Mesh Coated | Arosha CC-800C (800 Mesh Coated) |
|---|---|---|---|
| Dispersion in PP/PE | Poor, visible agglomerates | Good, but micro-dispersion limited | Excellent, no fisheyes in film |
| Max. Filler Loading in Rigid PVC | 20–25 phr | 30–35 phr | 40–50 phr (with suitable stabilizer) |
| Impact Strength Retention | Low | Moderate | High — fine particle size + perfect coating |
| Extruder Torque | Higher | Moderate | Consistently lower — measurable energy saving |
| Surface Gloss (Masterbatch) | Matte/dull | Semi-gloss | High gloss, excellent smoothness |
| Internal Lubricant Dosage | High | Medium | Reduced by 10–15% |
| Moisture Resistance in Storage | Poor | Good | Excellent — hydrophobic monolayer |
The sweet spot: The combination of 800 mesh fineness and precise coating chemistry delivers the ideal balance of processability, mechanical integrity, and surface aesthetics for demanding PVC and masterbatch applications.
Recommended loading 30–50 phr. The tight particle size distribution (D50 ~6 µm, D97 ≤18 µm) and low oil absorption enable higher throughput without sacrificing hydraulic burst strength. The hydrophobic coating eliminates moisture-related defects, ensuring smooth extrusion and consistent wall thickness.
Achieves 70–80% loading in twin-screw compounding with excellent dispersion. The stearic acid layer improves compatibility with the carrier resin, eliminating die lip build-up and extending continuous run times. High brightness (≥95.5%) reduces TiO₂ demand.
Ultrafine particle size enhances surface definition and reduces water absorption in wood-plastic composites. The coating minimizes fiber degradation during processing and improves edge sharpness in embossed profiles.
For talc replacement or partial substitution in PP/TPO, our 800 mesh coated product improves scratch resistance, maintains low density, and delivers a high-quality matte-to-satin finish without sacrificing impact performance at low temperatures.
The 6-micron mean size yields an exceptionally smooth, matte finish without excessive viscosity build-up. Suitable for solvent-based and water-based systems where controlled rheology and anti-settling properties are critical.
For specific formulation guidance, contact our technical support team — we have deep experience with regional polymer grades and stabilizer packages across the Middle East, CIS, and South Asia.
Selective mining: We operate our own high-whiteness limestone deposits in central Iran. Run-of-mine CaCO₃ purity exceeds 98.7%, ensuring minimal contaminants from the start.
Multi-stage grinding: Primary jaw crushing, followed by dry ball milling and precision air classification to achieve a stable 800 mesh base powder. Any lot with D50 drift beyond 6.5 µm or D97 above 18 µm is rejected before coating.
Pin-mill coating system: Our continuous pin-mill coater injects pre-melted, filtered stearic acid under controlled temperature and rotor speed. The intense mechanical action ensures every particle surface is activated — not just the coarse fraction.
Real-time quality loops: Samples are pulled every 30 minutes for brightness, moisture, and coating activation. A lot is only approved once it passes all specified limits — no exceptions.
Full traceability: Every 25 kg bag and jumbo bag carries a unique batch number linked to complete QC records, which we retain for 24 months.
We welcome customer audits — in person or via live video inspection.
Standard packaging: 25 kg multi-wall paper bags with inner PE liner, palletized and stretch-wrapped (1.25 MT per pallet). 20 pallets per 20ft container (25 MT net).
Bulk option: 1000–1250 kg conductive jumbo bags, ideal for silo discharge. Anti-static fabric available for ATEX-regulated zones.
Shelf life: 12 months in unopened original packaging, stored in dry conditions. The chemically bonded hydrophobic coating prevents moisture uptake even in high-humidity ports.
Shipping: Regular exports from Bandar Abbas (Persian Gulf) to GCC, India, Turkey, Africa, and CIS. Proforma invoices include detailed container loading plans and transit times.
FOB, CFR, or CIF terms available. We handle all export documentation: Certificate of Origin, mill test certificates, and any buyer-specific requirements.
ISO 9001:2015 (Quality Management System)
ISO 14001:2015 (Environmental Management)
REACH compliance for EU-bound shipments (documentation available on request)
Testing in accordance with ASTM D1199, ISO 787, ISO 3262
FDA indirect food contact statement available for specific polyolefin packaging applications
Third-party inspection by SGS, Bureau Veritas, or client-nominated agencies is welcomed and routinely arranged.
| Parameter | Arosha CC-800C | Typical Regional Competitor A | Imported Chinese Grade |
|---|---|---|---|
| True D50 | 5.5 µm | 7–8 µm (often marketed as 1250 mesh) | 6.5 µm (claimed, often coarser) |
| Coating Uniformity | >98% activation | 85–90% (mixed coat) | 92–95% |
| Brightness (R457) | ≥95.5% | 93–94% | 95% (with optical brighteners) |
| Oil Absorption | 19–21 g/100g | 24–27 g/100g | 18–20 g/100g |
| Moisture Residue | ≤0.25% | 0.4–0.6% | 0.3–0.5% |
| Price Stability | Contract-based quarterly | Fluctuates monthly | Subject to freight volatility |
| Technical Support | Dedicated polymer chemist | Limited | Not available |
Third-party lab results from client trials consistently show our 800 mesh coated calcium carbonate reduces extruder current by 8–12% compared to regional competitor A in rigid PVC formulations, while delivering higher gloss and better impact retention.
Uncoated powder has high surface energy that leads to agglomeration in plastics. Coated powder carries a hydrophobic stearic acid layer chemically bonded to the surface, which improves dispersion, reduces viscosity, and enhances mechanical properties — especially critical at 800 mesh fineness where agglomeration tendency is higher.
Absolutely. You’ll typically see better impact strength and a smoother internal/external surface. The finer particle size may slightly increase mixing torque initially, but our low oil absorption (19–21 g/100g) and perfect coating more than compensate — most customers report equal or lower overall energy consumption after optimization.
Our stearic acid is chemically reacted, not physically blended. The resulting calcium stearate monolayer is integral to the particle surface. We verify this with solvent extraction and FTIR spectroscopy — the coating does not rub off, even after long-distance dense-phase conveying.
Our stearic acid is vegetable-based. We can provide a compliance letter for indirect food contact in polyolefin packaging according to FDA 21 CFR or EU 10/2011. Please specify your target regulation when inquiring.
7–10 days ex-works after order confirmation for standard packaging. Container availability at Bandar Abbas may add 2–3 days. We maintain buffer stock of 800 mesh coated grade to ensure short lead times.
We produce 800 mesh as our standard fine coated grade. For custom distributions (e.g., D50 4 µm or 7 µm), a technical feasibility study and trial batch are required.
600 Mesh Coated Calcium Carbonate – For general-purpose PVC and masterbatch where a slightly coarser particle size is acceptable.
1250 Mesh Coated Calcium Carbonate – Ultra-fine for high-gloss coatings and premium thin-film masterbatch.
Uncoated 800 Mesh Powder – For aqueous adhesives, sealants, and systems where hydrophobicity is not required.
Note: Each grade has its own dedicated technical page. Consult our application engineers if you’re unsure which grade matches your process.