Polymer Blend Density Calculator
Estimate the density of a blend or masterbatch compound from component densities and weight percentages. Add up to four components; leave a row blank to ignore it.
Formula
1 / ρ_mix = Σ ( wᵢ / ρᵢ ) where wᵢ are mass fractions (normalised to sum 1) and ρᵢ are component densities. Volume fraction of each component = (wᵢ/ρᵢ) / Σ(wⱼ/ρⱼ).
Estimated blend density assuming additive volumes and no significant contraction or expansion on mixing. Real compounds with fillers, voids or strong interactions can deviate; treat this as a planning estimate, not a measured value.
Why weight % and density both matter
3 wt% of a 1.20 g/cm³ masterbatch in a 0.920 g/cm³ polyethylene occupies only ~2.3% of the volume, and lifts the blend density to about 0.926 g/cm³ — a plain average of the densities would get this wrong. This is the same effect that makes layer mass depend on density in the multilayer film calculator.
Computed by the shared MatQuo masterbatch engine (/tools/mb-engine.js).
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