Loading strategy
Discuss the target filler level together with processing and finished-part requirements.
Masterbatch & filler
Calpet / Calcium Filler
Calpet calcium carbonate-filled compounds developed around polymer, filler loading, processing method, cost target, and finished plastic application.
Product overview
Use filler as an engineered part of the material system—not a generic cost substitute.
Polymaid manufactures Calpet calcium carbonate-filled compounds for plastic processors. The right filler system depends on the base polymer, calcium carbonate characteristics, carrier, loading target, process, and finished-product requirements.
Polymer and carrier
Review compatibility with the intended PP, PE, or other project-specific resin system.
Production context
Consider molding, film, sheet, raffia, nonwoven, or extrusion conditions.
Applications
Built around the finished product.
Explore potential applications, then confirm the right grade for your resin and production conditions.
Explore manufacturing processes ↗- Injection molding
- Blow molding
- Raffia tape
- Woven sacks
- Sheet extrusion
- Poly bags
- Nonwoven fabric
- Strapping and profiles
Calcium-filler benchmark
Separate concentrate content from production dosage.
Technical literature for calcium-carbonate masterbatch reports both the CaCO3 level inside the pellet and the amount of masterbatch added to the base polymer. They are different numbers and must be evaluated together.
Independent industry reference examplesValues by weight unless noted
| Application starting point | CaCO3 in concentrate | Published addition reference | Carrier / compatibility |
|---|---|---|---|
| Film, yarn, and general polyolefins | 83 +/- 1% | 5-25% | PE + PP / LLDPE, LDPE, HDPE, PP |
| PP injection molding | 86 +/- 2% | 5-40% | PP |
| Blown PE film above 15 microns | 81.5 +/- 2% | 40% average reference | PE |
How to use this chart: These are independent manufacturer benchmarks, not Polymaid specifications or universal recipes. Begin conservatively, then confirm dispersion, film or part properties, surface, density, output, and economics in the customer's resin and equipment before approving a Polymaid grade.
Calpet is a formulation decision
Calcium carbonate filler can influence material cost, stiffness, density, appearance, shrinkage, thermal behavior, and processing. Those effects depend on the complete formulation and should be evaluated as trade-offs rather than assumed benefits.
Particle characteristics, surface treatment, carrier resin, dispersion, moisture control, and loading all matter to the production result.
Define the acceptable balance
A strong enquiry explains what the processor wants to achieve and which properties cannot be compromised. Share the base resin, current formulation, process, existing filler level, finished application, and target economics.
Polymaid can then review the most relevant Calpet direction for sampling and customer validation. Production approval remains the customer’s responsibility in the intended formulation and equipment.
Product questions
A few things worth knowing.
What is Calpet?
Calpet is the term used here for Polymaid’s calcium carbonate-filled material systems for plastics processing.
How much calcium filler can I add?
There is no universal loading level. It depends on the polymer, process, particle and carrier system, product geometry, and acceptable property trade-offs. A trial is required.
Can calcium filler reduce material cost?
It may change formulation economics, but cost should be assessed alongside density, mechanical properties, processing behavior, appearance, and reject rate.
Keep exploring
More from the Polymaid range.
Let’s make it work for you
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