Plastic Grade
Dolomite Powder
High-purity, custom mesh dolomite powder engineered for rigidity, heat resistance and cost-effective compounding in PVC pipes, profiles, sheets and masterbatches.
Trusted For
Rigid Plastic & PVC Applications
Our plastic grade dolomite powder is processed to deliver consistent particle size, low moisture and high combined carbonate content. Plastic processors use it as a functional filler in PVC pipes, profiles, sheets, cables and masterbatches, where it replaces a portion of costlier resin without compromising strength.
Because dolomite carries magnesium carbonate along with calcium carbonate, it is harder and more heat resistant than plain calcium carbonate filler. This makes it a preferred choice for rigid PVC applications that demand dimensional stability during extrusion and injection molding. Explore our complete range of dolomite powder grades to find the right fit for your process.
Strong & Stable
Built for consistent processing, rigidity and dimensional stability in demanding plastic formulations.
Plastic Grade Dolomite Powder Specifications
| Parameter | Typical Value |
|---|---|
| Whiteness | 90% to 95% |
| Mesh Grade | 100 to 800 Mesh (custom mesh available) |
| Combined CaCO3 + MgCO3 | 97% and above |
| Moisture Content | Below 0.3% |
| Coating | Uncoated or stearic acid coated, on request |
| Packaging | 25 kg / 50 kg HDPE bags, jumbo bags on request |
Values are typical and may vary by batch. Request a current test certificate for your specific mesh and grade requirement.
Why Choose Our Product
Common Uses
PVC Pipes & Profiles
Used as a functional filler to improve rigidity, dimensional stability and cost efficiency in rigid PVC extrusion.
Masterbatches & Compounding
Finer, coated mesh grades support smooth dispersion and consistent loading in filler masterbatches.
Sheets & Rigid Profiles
Contributes to a smooth surface finish and stable processing in extruded plastic sheets and window profiles.
Paints, Rubber & Ceramics
The same base mineral also supports formulations across paints, rubber compounding and ceramic industries.
Dolomite Powder vs Calcium Carbonate Powder for Plastics
Both minerals are used as fillers in plastic compounding, but they are not always interchangeable. Here is how plastic processors typically decide between the two.
Plastic Grade Dolomite Powder
- Contains both calcium and magnesium carbonate, giving it more hardness
- Better heat resistance during extrusion and molding
- Preferred for rigid PVC pipes, profiles and sheets
- Available in uncoated or stearic acid coated grades
Calcium Carbonate Powder
- Pure calcium carbonate with no magnesium content
- Generally more cost-effective for high-volume use
- Common in flexible and economy grade plastics
- Softer mineral, lower heat resistance than dolomite
Common Questions
What is plastic grade dolomite powder used for?
Plastic grade dolomite powder is used as a functional filler in PVC pipes, profiles, sheets, cables and masterbatches. It improves rigidity, dimensional stability and heat resistance of the finished plastic product while reducing the overall resin content and cost per kilogram.
What mesh size of dolomite powder is used for PVC pipes and profiles?
For PVC pipes, profiles and rigid extrusion products, 300 to 600 mesh dolomite powder is most common. Finer grades of 600 to 800 mesh are preferred for masterbatch and injection molding applications where smooth dispersion and surface finish are critical.
Is coated dolomite powder better than uncoated for plastic applications?
Stearic acid coated dolomite powder disperses more evenly in PVC and other resin systems, resists moisture pickup and reduces processing torque during compounding. It is generally recommended for masterbatches and high-output extrusion lines, while uncoated grades work well for standard rigid plastic applications.
What is the difference between dolomite powder and calcium carbonate powder in plastics?
Dolomite powder contains both calcium carbonate and magnesium carbonate, which gives it added hardness and better heat resistance compared to plain calcium carbonate. This makes dolomite powder a preferred filler for rigid PVC pipes and profiles, while calcium carbonate is more commonly used where maximum whiteness and lower cost are the priority.
What purity level is required for plastic grade dolomite powder in India?
Plastic manufacturers in India typically require a combined CaCO3 and MgCO3 content of 97% or above with low moisture and low iron content. Vrindavan Minerals supplies plastic grade dolomite powder that meets this specification with batch-wise quality testing.
What packaging is available for plastic grade dolomite powder orders?
Plastic grade dolomite powder is packed in 25 kg or 50 kg moisture-resistant HDPE bags with an inner liner. Jumbo bags and custom packaging are available for bulk industrial orders and export shipments based on buyer requirement.
Get A Custom Supply Plan
Share your grade, mesh size, coating and packaging requirements and our team will assist with the right product solution for your plastic application.
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