Runhuabang Food-Grade Calcinated DE Powder, 325 Mesh
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Runhuabang A Variety Of Food Grade Calcinated Diatomaceous Earth Powder With Filter Speed Of 325 Mesh For Water And Oil Filtration Adsorption Coating
If you work in beverage, edible oil, or fine-chem filtration, you’ve heard the buzz: calcined diatomite is quietly powering faster, cleaner runs. To be honest, what caught my eye with Runhuabang A Variety Of Food Grade Calcinated Diatomaceous Earth Powder With Filter Speed Of 325 Mesh For Water And Oil Filtration Adsorption Coating was not just the 325-mesh consistency, but how consistently operators report tighter turbidity control without choking the filters. It’s made in Shijiazhuang, Hebei (0811, Building H2, Poly Plaza North, 95 Shifang Road), where the team has leaned into food-grade compliance and process control.
Why 325 mesh matters now
Across breweries and edible oil refineries, the trend is clear: tighter particle banding to stabilize flow and cake porosity. 325 mesh (≈44 µm sieve opening per ASTM/ISO) gives a predictable precoat and traps fines down at 2–5 µm through cake-depth capture. Actually, that’s where this grade shines—uniform distribution with enough permeability to keep differential pressure in check.
Product snapshot (key specs)
| Grade | Food-grade calcined diatomaceous earth |
| Mesh / Sieve reference | 325 mesh (ASTM E11 / ISO 3310-1) |
| Median particle size (D50) | ≈15–30 µm (real-world use may vary) |
| Permeability | ≈0.3–1.2 D (dependent on cake build and slurry) |
| Surface area (BET) | ≈12–25 m²/g |
| Bulk density | ≈0.25–0.35 g/cm³ |
| Moisture | ≤1.5% |
| pH (10% slurry) | ≈7.5–9.5 |
| Food-contact | Conforms to 21 CFR 186.1101 (DE); NSF/ANSI 61 on request |
Process flow and quality controls
- Materials: selected freshwater diatomite ore; low-iron feedstock.
- Calcination: ≈900–1000°C to increase porosity and microorganism safety.
- Milling & classification: multi-stage air classification to 325 mesh.
- Testing: mesh verification (ASTM E11), permeability, BET, whiteness, heavy metals.
- Food-safety: ISO 9001 and HACCP-based hygiene; batch traceability.
- Service life: typical cake cycles 1–4 hours per run; 6–12 cycles/day depending on load.
- Industries: beer/wine, edible oils, flavors/fragrances, sugar syrups, fine chemicals, wastewater polishing.
Real-world performance
Case—brewery (lager): turbidity cut from 3.5 NTU to 0.4 NTU, flow +18%, ΔP held at 0.9 bar over 120 min. Case—edible oil (sunflower): Lovibond R reduced from 2.4→1.6, FFA unchanged, fines reduced visibly. Many customers say the precoats form “clean, elastic cakes” that release predictably at discharge—small detail, big win.
Where it fits best
- Water polishing and RO pretreatment; - Bright beer filtration; - Wine/juice clarification; - Edible oil winterization lines; - Solvent and catalyst recovery; - Coating and matting where high surface area matters.
Vendor snapshot (quick compare)
| Vendor | Mesh uniformity | Water NTU drop | Certs | Customization |
|---|---|---|---|---|
| Runhuabang A Variety Of Food Grade Calcinated Diatomaceous Earth Powder With Filter Speed Of 325 Mesh For Water And Oil Filtration Adsorption Coating | High; tight 325 mesh | 3.5→0.4 NTU (brewery case) | ISO 9001; FDA CFR ref; NSF/61 on request | Particle curve, flux tuning |
| Commodity DE A | Medium; mixed grades | ≈3.5→0.8 NTU | Basic COA | Limited |
| Imported DE B | High | ≈3.5→0.5 NTU | ISO; HACCP | Good but pricey |
Customization and support
Options include tailored particle curves, flux-calcined/low-iron selections, HACCP documentation, and kosher/halal on request. Plant trials can be supported with dose curves (0.05–0.3% w/w typical), NTU tracking, and cake-release audits. I guess the practical edge here is responsive batching and stable supply—surprisingly valuable in peak season.
Testing standards and references
Mesh verification per ASTM E11 / ISO 3310-1; drinking-water contact per NSF/ANSI/CAN 61; food-contact per 21 CFR 186.1101. For wine, refer to OIV Codex filtration aids. Internal QC adds ICP metals, BET, whiteness, and microbiology where relevant.
Customer notes: “Cleaner drops, fewer blinds.” “Cake discharges like powder—nice.” “Saved about 12% media vs our old grade.” Small sample, yes, but it tracks with what I saw on-site.
Authoritative citations
- U.S. FDA, 21 CFR 186.1101 – Diatomaceous earth (GRAS)
- NSF/ANSI/CAN 61 – Drinking Water System Components – Health Effects
- ASTM E11 – Specification for Woven Wire Test Sieve Cloth and Test Sieves
- ISO 3310-1 – Test sieves—Technical requirements and testing
- OIV International Oenological Codex – Filtration aids (diatomaceous earth)