Epoxy Hardener Converter

How the Epoxy Hardener Converter Works

The Epoxy Hardener Converter divides Part B (hardener) mass by hardener density. The default 0.98 kg/L fits a typical amine hardener.

Find the Part B density
Read the hardener density on the TDS or the B-side label.
Enter the hardener mass
Type the Part B weight in kilograms.
Read the liters
The result shows Part B volume for measuring cups and pumps.
Check the ratio
Divide hardener volume by resin volume to confirm the kit volume ratio.

The epoxy hardener formula is V_B = m_B ÷ ρ_B. A weight ratio becomes a volume ratio by multiplying by ρ_A ÷ ρ_B.

V_B = m_B ÷ ρ_B

Volume ratio (B:A) = Weight ratio (B:A) × ρ_A ÷ ρ_B

2 kg of hardener: 2 ÷ 0.98 = 2.041 L.
Weight ratio 100:45 → volume: 0.45 × 1.16 ÷ 0.98 = 0.533, about 100:53 by volume.
Anhydride hardener: 5 kg ÷ 1.20 = 4.167 L.

1 kg of amine epoxy hardener fills 1.020 liters, more volume than the same weight of resin. The table lists 6 hardener chemistries.

Hardener Type	Density (kg/L)	Liters per 1 kg	Liters per 5 kg	Volume vs 1 kg resin
Aliphatic amine (fast)	0.980	1.020	5.102	1.184×
Polyamide	0.970	1.031	5.155	1.196×
Amidoamine	0.960	1.042	5.208	1.208×
Cycloaliphatic amine	1.020	0.980	4.902	1.137×
Phenalkamine	1.000	1.000	5.000	1.160×
Anhydride (heat cure)	1.200	0.833	4.167	0.967×

An Epoxy Hardener Converter is a calculator that converts epoxy Part B hardener weight into volume.

Epoxy hardeners, called curing agents, contain reactive amine or anhydride groups. Each reactive hydrogen links to one epoxide group in the resin.

Amine hardeners are lighter than epoxy resin at 0.95–1.05 kg/L. Anhydride hardeners for heat-cured electrical potting run heavier at about 1.2 kg/L.

There are 4 main uses of an Epoxy Hardener Converter.