Composites World / NetComposites

Connecting you to the composites industry


NetComposites Ltd has transferred the rights and ownership of this website to Gardner Business Media Inc.

On 1st January 2020, NetComposites' media assets including, newsletters and conferences were transferred to Composites World (Gardner Business Media).

This site is no longer being updated. Please direct all enquiries to

For further details see our joint press release.


Volume-Weight Fraction Calculator

This tool converts volume fractions to weight fractions (and vice versa) and calculates the overall density of a composite.

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Resin Formula Calculator

This tool calculates the overall density and price of a resin system (polymer resin + additives). Simply type in the amount (in parts per hundred by weight – the polymer resin is set to 100), the density (in g/cm3) and price (in $/kg or other currency/kg) of each component of the resin system (e.g. polymer resin, filler, catalyst, accelerator etc.) and click calculate. We have provided some indicative density data for common resins and additives for reference purposes, although price data has been omitted due to the variables in cost.

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Unit Converter

Use to calculate yield, areal weight and density of composite materials.

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Cured Ply Thickness Calculator

This tool calculates the individual cured ply thickness in a laminate, given: the areal weight of the reinforcement fibres (in g/m2); the density of those fibres (in g/cm3); and the weight fraction and density of the matrix resin. (A second calculator is provided to convert volume fraction of fibres to weight fraction of resin – this uses the same weight and density data entered into the ply-thickness calculator.) The tool does not take into consideration any content of voids in the ply/laminate.

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