Dolomite Powder400

Dolomite Powder 400 Mesh

400 Mesh Dolomite Powder is a universal medium-coarse industrial dolomite filler, bridging the performance gap between coarse 200 mesh and fine 600 mesh dolomite powder. It balances large filling capacity and excellent surface modification effect, with uniform particle size, standard CaO content (27–35% per TDS TDHX-Dolomite-2025-08) and high whiteness of 90-94. Featuring good fluidity and low moisture, it is widely used in plastic modification, coating processing, rubber products and light industry filling fields, with outstanding

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Technical Specifications

Specification	Value
Mesh size	400
Whiteness	88-94
Purity	50
Moisture	0.3

Applications & Industries

General modified plastics
rubber products
EVA foaming materials
industrial coatings
architectural paints
adhesives
papermaking filling
daily chemicals
building materials
ceramic manufacturing

Product Performance & Advantages

400 mesh dolomite powder is finely ground and multi-layer precisely screened, with pass rate stably reaching 92%-99.993% and no coarse particles. Compared with 200 mesh coarse powder, it has finer texture, better product surface flatness and higher modification accuracy; compared with fine mesh powder, it has larger filling capacity and lower production cost. With fixed standard calcium oxide content, it has stable acid and alkali resistance and weather resistance. It can effectively improve product rigidity, dimensional stability and wear resistance, optimizing production formula and reducing comprehensive costs.

Application Scope

Widely used in general modified plastics, PVC/PP/PE products, rubber filling and reinforcement, EVA foaming materials. In chemical industry, it serves as core filler for industrial coatings, architectural water-based paints, adhesives and sealants. It is also applicable for papermaking filling, daily chemical auxiliaries, building materials and ceramic raw material processing, covering most conventional industrial filling scenarios.

Custom Service

Full customization of CaO content (27%–35%), whiteness (90-94), particle pass rate and particle size distribution. Multiple grades of standard industrial grade and high-whiteness decorative grade are available to meet different production standards.

Packaging Options

25KG/50KG woven bags, ton bags, bulk cargo packaging, support OEM private label customization and exclusive packaging design.

Price Note

Price varies by raw material grade and customized indexes. Fixed parameter range: whiteness 90-94, CaO 27–35%, moisture ≤0.5%, pass rate 92%-99.993%. Factory bulk wholesale supply.

Industries that use this grade

Frequently Asked Questions

What are the CaO and MgO contents of your dolomite powder?

Our dolomite standard TDHX-Dolomite-2025-08 specifies CaO 27–35%, MgO 22–30%, SiO₂ ≤8%, Fe₂O₃ ≤0.5% and whiteness 80–95. Individual grades sit inside that window; the TDS is available for download on this page. Tell us your target chemistry and we will confirm which grade matches.

Which industries use dolomite powder?

Glass and ceramics (CaO–MgO source), coatings and plastics (functional filler), construction (mortar and concrete), and environmental protection (flue gas desulphurisation).

Why is dolomite powder used in glass melting?

Dolomite supplies both CaO and MgO in one raw material, which lowers the melting temperature, aids refining, and improves the thermal and chemical durability of the finished glass.

Can dolomite powder be customised for my process?

Yes — mesh size from 200 to 2000 mesh, whiteness 80–95, and CaO/MgO ratios can all be adjusted. Free samples are available for bench testing.

Need a custom specification?

Tell us your target mesh size, whiteness and application. We send samples and a quotation within 24 hours.