Polymer & Plastics · Calculate & Specify
Composite Density & Filler Loading Calculator
A filled compound is bought by weight and consumed by volume. This calculator converts filler loading into composite density and volumetric substitution, so you can see how much part volume a tonne of compound actually produces before you commit to a loading level.
ρ-1B
Composite Density
ρComposite = 100 / ( WResin/ρResin + WFiller/ρFiller )
g/cm³ · PP 0.905 · LLDPE 0.920
g/cm³ · CaCO₃ 2.71 · Talc 2.78
wt %
Composite density
1.131
g/cm³
Resin fraction
70%
Density shift vs resin
+24.97%
High-load filler → volumetric output shift
A 30% mineral load increases composite density by 25%. Volumetric output per screw revolution drops accordingly — open die gap by 10%–15% and re-calibrate haul-off to minimise post-extrusion shrinkage and gauge variation.
AllZone · Engineering
Use this when
- You are raising calcium carbonate or talc loading and need the new part weight.
- You are comparing two compounds quoted per tonne but consumed per part.
- You need the volume the filler genuinely displaces, not the weight percentage.
How the number is produced
- Composite density is the rule of mixtures over volume fractions of resin and mineral.
- Volume fraction is derived from weight fraction and each component's true density.
- Volumetric substitution shows the resin volume the filler replaces at that loading.
Materials for this job
- Mineral fillers, pigments & reinforcementCalcium carbonate, talc and TiO₂ in powder and masterbatch form.
- Masterbatch — white, colour, additive, desiccantThe grades you dose against the ratio this tool returns.
- Polymer & plastics raw materialsResins, fillers, masterbatch and additives in one catalogue.
Engineering aid only. Validate against your own instrumented trial, the polymer datasheet and the applicable ASTM / ISO method before locking a process window or a specification.
Related knowledge & tools
- Calcium carbonate vs talcThe density and stiffness trade-off behind the numbers.
- Calcium carbonate in plasticsWhere loading limits start to cost you properties.
- Mesh, D50 and top cutRead the filler spec that feeds this calculation.
- All Polymer & Plastics toolsCalculate, diagnose and specify in one place.
- Polymer & Plastics KnowledgeSolve a problem, choose and compare, learn, calculate.
- Production & formulation engineering matrixThe full shop-floor suite, including SEC and screen-pack ΔP.
- Allzone Knowledge CenterSearch by problem, industry or material.