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| Parameter | Typical Value |
|---|---|
| Product Grade | Arosha CC-600C |
| Mesh Size | 600 Mesh (approx. 23 µm top cut) |
| Coating Agent | High-purity Stearic Acid |
| Coating Percentage | 1.0 ± 0.2 % |
| Brightness (R457) | ≥ 95.5 % |
| D50 (Laser) | 6.5 – 7.5 µm |
| D97 (Laser) | ≤ 23 µm |
| Moisture | ≤ 0.3 % |
Established in 2005, Arosha Powder is a direct from mine manufacturer of Coated Calcium Carbonate 600 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 ≤ 23 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 need to push filler loading without sacrificing surface finish, throughput, or mechanical integrity. By grinding high-brightness Iranian limestone to a tightly controlled top cut and then applying a dry stearic acid coating in a high-speed mixer, we create a hydrophobic surface that replaces the need for additional processing aids in rigid PVC formulations. The coating level and activation degree are monitored batch-wise to ensure that every consignment disperses instantly in the polymer matrix, reducing torque and energy consumption on your extrusion lines.
| Property | Specification | Test Method |
|---|---|---|
| CaCO3 Content | ≥ 98.5 % | Titration / XRF |
| MgCO3 | ≤ 1.0 % | Titration |
| Acid Insoluble Matter | ≤ 0.2 % | HCl digestion |
| pH (10% slurry) | 9.0 – 9.5 | pH meter |
| Moisture (at 105°C) | ≤ 0.3 % | ASTM D280 |
| Property | Specification | Test Method |
|---|---|---|
| Oil Absorption | 22 – 26 g/100g | ASTM D281 |
| Specific Gravity | 2.7 g/cm³ | Pycnometer |
| Bulk Density (loose) | 0.75 – 0.85 g/ml | Graduated cylinder |
| Bulk Density (tapped) | 1.10 – 1.20 g/ml | Tapped |
| Brightness (R457, ISO) | ≥ 95.5 % | ISO 2470 |
| Yellowness Index | ≤ 1.5 | ASTM E313 |
| D50 Particle Size | 6.5 – 7.5 µm | Laser Diffraction |
| D97 Particle Size | ≤ 23 µm | Laser Diffraction |
| Residue on 325 Mesh (45 µm) | ≤ 0.01 % | Wet sieve |
| Property | Specification | Test Method |
|---|---|---|
| Coating Agent Content | 1.0 ± 0.2 % | Weight loss / ashing |
| Activation Degree | ≥ 98 % | Methanol method |
| Surface Treatment | Stearic Acid (Dry coating) | – |
Specifications represent typical values. Certificate of Analysis with batch-specific values accompanies every shipment.
Control of top size is critical for dispersion and surface quality. The 600 mesh designation is enforced by rigorous sieve analysis and verified by laser diffraction on every production batch.
| Sieve Aperture | Cumulative Retained (%) |
|---|---|
| +150 µm (100 mesh) | 0.0 % |
| +75 µm (200 mesh) | 0.0 % |
| +45 µm (325 mesh) | ≤ 0.01 % |
| -45 µm passing | ≥ 99.99 % |
Laser diffraction confirms a sharp distribution with D10 around 1.8 µm and D90 below 16 µm, ensuring no coarse agglomerates survive the coating process. The narrow particle size band directly translates to consistent rheology and pigment savings in white masterbatch.
We apply a dry coating process where precisely metered stearic acid is fused onto the particle surfaces under controlled frictional heat. This is not a simple blending – the process is monitored to achieve an activation degree exceeding 98%, ensuring true hydrophobicity and polymer compatibility.
| Parameter | Detail |
|---|---|
| Coating Agent | Triple-pressed Stearic Acid (C18 ≥ 97%) |
| Coating Dosage | 1.0 ± 0.2 % of mineral weight |
| Activation Method | High-speed mixer (1400 rpm), discharge temp 105-110°C |
| Activation Degree | ≥ 98% (methanol float test) |
| Formulation | Torque at 8 min | Fusion Time |
|---|---|---|
| Uncoated 600 mesh CaCO3 (20 phr) | 28.5 Nm | 1 min 50 sec |
| Arosha 600 Mesh Coated (20 phr) | 22.1 Nm | 1 min 35 sec |
The 22% reduction in equilibrium torque means direct energy savings and higher possible filler loadings without overloading the extruder motor.
Our 600 mesh coated calcium carbonate is the workhorse filler for multiple polymer processing routes. Below are start-point formulations based on feedback from our industrial customers.
| Application | Typical Loading (phr / %) | Key Benefits | Processing Notes |
|---|---|---|---|
| Rigid PVC Pipe | 15 – 30 phr (12-22%) | Reduced plate-out, higher output, good impact balance | Direct addition in hot mixer after PVC reaches 80°C |
| PVC Profiles & Windows | 10 – 25 phr | Smooth surface, weather resistance with coated surface | Can replace part of TiO2 and impact modifier |
| Flexible PVC Cables | 20 – 50 phr | Low moisture, excellent dielectric stability | Pre-dispersion with plasticizer recommended |
| PE/PP Filler Masterbatch | 70 – 82 % masterbatch | High filler loading, LDPE/LLDPE carrier compatible, lacing-free | Use high-shear twin-screw, 180-210°C |
| Plastisol & Coatings | 50 – 100 phr | Low oil absorption, viscosity control | Coating reduces thickener demand |
| Rubber & Adhesives | 40 – 80 phr | Fast incorporation, reduced mixing time | Semi-reinforcing filler |
These are guiding values. Our technical team can help you optimize for your specific compound. We regularly run plant trials for new clients.
Quality is not tested into our product; it is built at every stage. Our ISO 9001:2015 certified management system governs the following inspection gates for the 600 Mesh Coated grade:
Raw Limestone: XRF analysis for CaCO3, brightness, heavy metals – only high-grade lumps accepted.
Grinding & Classification: Continuous particle size checks (every 2 hours) via laser diffraction to hold D97 ≤ 23 µm.
Coating In-Process: Activation degree is tested after each 500 kg batch from the high-speed mixer. Uncoated material is immediately re-processed if below 98%.
Final Product: Composite sample tested for all specifications listed in the Technical Specifications section. Retain sample stored for 12 months.
Packaging & Loading: Final inspection for bag integrity, pallet weight, and container cleanliness.
We provide a digital Certificate of Analysis (COA) with every shipment. Third-party inspection (SGS, Bureau Veritas) is welcomed.
We understand that B2B procurement involves landed cost calculation. Below are our standard export packaging configurations for 600 Mesh Coated Calcium Carbonate.
| Packaging Type | Net Weight | Pallet Configuration | 20ft Container Load | Remarks |
|---|---|---|---|---|
| PP Valve Bag | 25 kg | 50 bags/pallet (1250 kg), heat-treated wooden pallet | 20 pallets (25 MT) | Standard export, 4-way entry, shrink-wrapped |
| Jumbo Bag (FIBC) | 1000 kg / 1250 kg | Single bag on pallet or sling | 20-25 bags (20-25 MT) | With liner for moisture protection, discharge spout |
| Custom Private Label Bag | As specified | As per brand requirements | Flexible | MOQ applies, printing blocks customer-provided |
Pallet dimensions: 110 × 110 cm or 110 × 130 cm. Container loading is supervised to ensure even weight distribution and fumigation compliance (ISPM 15). We ship from Bandar Abbas port with an average transit time of 18-28 days to major Asian and CIS destinations.
Direct Manufacturer: We own the grinding and coating lines. No middlemen, no quality dilution.
Consistent Ore Source: Our limestone deposit has exceptional whiteness and low heavy metals – the foundation of a stable 600 mesh coated product.
Export Proven: Over 8 years of supplying this specific grade to PVC pipe and masterbatch plants in 20+ countries.
Technical Support: Our engineers speak polymer. We assist with formulation adjustments, process troubleshooting, and even screw configuration advice.
Flexible Partnership: OEM packaging, monthly fixed contracts, spot purchases, trial samples – we adapt to your supply chain.
Request a detailed COA for your next batch.
Ask for a free 2 kg sample shipped to your plant.
Talk to our engineers about your filler optimization.
A: 600 mesh defines the top particle size – our product passes through a 600-mesh screen with virtually no residue, and laser analysis shows a D97 ≤ 23 µm. “Coated” means each particle is surface-treated with stearic acid (1%) to become hydrophobic, improving dispersion in plastics. This specific combination is engineered for processors needing high filler loading with low torque penalty.
A: The stearic acid coating reduces internal friction, leading to lower fusion torque and less energy demand during extrusion. It also minimizes plate-out on the die and screws, extends cleaning intervals, and allows you to increase filler content without sacrificing output rate.
A: Activation degree measures the completeness of coating. We test it by observing if particles float on methanol. ≥98% means virtually every particle is hydrophobic, ensuring uniform dispersion. Lower activation can cause agglomerates and surface defects. Our batch rejection limit is strict.
A: Yes. While most common in PE/PP carrier, we have customers successfully using it in EVA and wax-based masterbatches. The key is sufficient shear during mixing. We can provide guidance for your specific carrier.
A: Absolutely. We offer private label bags with your brand, product code, and safety instructions. Minimum order quantity applies for the first print run. We also provide COAs under your company’s letterhead upon request.
A: We ship a 2 kg free sample via air courier (DHL) within 3 working days of request. For trial production quantities (1-5 MT), lead time is typically 7-10 days from order confirmation. Contact us with your delivery address.