Salts & brines

Ammonium sulfate · (NH4)2SO4

Name: Ammonium sulfate ((NH4)2SO4) aqueous solution properties
Creator: ProcessConvert
License: https://creativecommons.org/licenses/by/4.0/

Ammonium sulfate ((NH4)2SO4) is a salt; this page gives computed density and dynamic viscosity for aqueous solutions from 2–40 wt% and 15–55 °C.

Values are computed from the Laliberté (2009) aqueous-electrolyte correlation and tabulated over 2–40 wt% and 15–55 °C.

Also known as: Sulfate of ammonia, AMS, Diammonium sulfate
CAS number: 7783-20-2
Tabulated range: 2–40 wt% · 15–55 °C
Properties: Density · Dynamic viscosity · Specific gravity

At 20 wt% · 20 °C

reference snapshot

Density: 1114.8kg/m³
Density: 1.1148g/cm³
Specific gravity: 1.117
Viscosity: 1.441cP

Explore

Read a value at any point

Move the sliders to interpolate between the tabulated grid points. The readout and chart never go outside the validated 2–40 wt% and 15–55 °C range, and every number is interpolated from the committed table below — nothing is computed from a chemistry model in your browser.

Interactive explorer

Values are interpolated between the tabulated grid points below — sliders stay within the validated 2–40 wt% and 15–55 °C range.

Concentration21 wt%

Temperature20 °C

Density: 1120.6 kg/m³
Density: 1.1206 g/cm³
Specific gravity: 1.123
Dynamic viscosity: 1.475 cP

Density (kg/m³) vs wt% (NH4)2SO4 at 20 °C — Ammonium sulfate.

Why it matters

What the numbers tell you

At 20 wt% and 20 °C, aqueous ammonium sulfate has a density of about 1115 kg/m³ (1.115 g/cm³) — roughly 1.12× the density of water. It also has a dynamic viscosity of about 1.441 cP, against roughly 1 cP for water at the same temperature. Those differences carry straight into volume-to-mass conversions, pump and pipe sizing.

Common grades

A few working strengths

Properties at 20 °C for a handful of concentrations in everyday use, read from the committed grid (interpolated between tabulated points where a grade falls between them). The full table follows below.

wt% (NH4)2SO4	°C	Density kg/m³	SG	Viscosity cP
10	20	1056.9	1.059	1.186
20	20	1114.8	1.117	1.441
30	20	1172.2	1.174	1.868
40	20	1228.8	1.231	2.588

Sources

Where the numbers come from

Every value on this page is computed by a deterministic model — none is entered by hand. The generating method and the references it is checked against:

▸Laliberte, M. (2009). A Model for Calculating the Heat Capacity of Aqueous Solutions, with Updated Density and Viscosity Data. J. Chem. Eng. Data 54(6), 1725-1760. doi:10.1021/je8008123
▸CRC Handbook of Chemistry and Physics, 97th ed. (Haynes, ed., 2016) - Concentrative Properties of Aqueous Solutions (density and viscosity at 20 degC)
▸CRC Handbook of Chemistry and Physics - Aqueous Solubility of Inorganic Compounds at Various Temperatures (solubility bounds for the tabulated range)

Model: thermo==0.4.0 (chemicals==1.3.0) - Laliberte 2009 electrolyte correlation · Generated 2026-06-07

The committed data file for this page is published as JSON on GitHub under CC BY 4.0.

Validation

Checked against a cited value

The model is cross-checked at one independently cited reference point. The page is published only because this check passes.

Property / point	Density · 20 wt% · 20 °C
Cited reference value	1115.4 kg/m3
Model computed	1114.85 kg/m3
Error vs reference	0.049% (tolerance 1%)

CRC Handbook of Chemistry and Physics, 97th ed.. Haynes, W.M. (ed.), CRC Handbook of Chemistry and Physics, 97th ed. (CRC Press, 2016), Concentrative Properties of Aqueous Solutions, p. 5-119: 20.0 mass % (NH4)2SO4 at 20 degC = 1.1154 g/cm3. Perry's Chemical Engineers' Handbook, 7th ed. (Table 2-38 Ammonium Sulfate) tabulates the identical value at 20 wt%, 20 degC.

Full tables

Every tabulated point

Rows are temperature (°C); columns are concentration (wt% (NH4)2SO4). Read the cell at the intersection. Specific gravity is density divided by the model water reference of 998.2 kg/m³ at 20 °C.

Density — kg/m³

°C \ wt%	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	40
15	1010.9	1022.7	1034.5	1046.3	1058.0	1069.7	1081.3	1092.9	1104.5	1116.1	1127.6	1139.1	1150.6	1162.0	1173.4	1184.8	1196.1	1207.5	1218.7	1230.0
20	1010.0	1021.7	1033.5	1045.2	1056.9	1068.5	1080.1	1091.7	1103.3	1114.8	1126.4	1137.9	1149.3	1160.8	1172.2	1183.6	1194.9	1206.2	1217.5	1228.8
25	1008.8	1020.5	1032.2	1043.8	1055.5	1067.1	1078.7	1090.3	1101.8	1113.4	1124.9	1136.4	1147.8	1159.3	1170.7	1182.1	1193.5	1204.8	1216.2	1227.5
30	1007.3	1019.0	1030.6	1042.3	1053.9	1065.5	1077.0	1088.6	1100.1	1111.7	1123.2	1134.6	1146.1	1157.6	1169.0	1180.4	1191.8	1203.2	1214.6	1225.9
35	1005.7	1017.3	1028.9	1040.5	1052.1	1063.6	1075.2	1086.7	1098.2	1109.7	1121.2	1132.7	1144.2	1155.7	1167.1	1178.6	1190.0	1201.4	1212.8	1224.2
40	1003.8	1015.4	1026.9	1038.5	1050.1	1061.6	1073.1	1084.6	1096.1	1107.6	1119.1	1130.6	1142.1	1153.6	1165.1	1176.5	1188.0	1199.5	1210.9	1222.4
45	1001.8	1013.3	1024.8	1036.3	1047.9	1059.4	1070.9	1082.4	1093.9	1105.4	1116.9	1128.4	1139.9	1151.4	1162.9	1174.4	1185.9	1197.4	1208.9	1220.4
50	999.5	1011.0	1022.5	1034.0	1045.5	1057.0	1068.5	1080.0	1091.5	1103.0	1114.5	1126.0	1137.5	1149.0	1160.5	1172.1	1183.6	1195.2	1206.7	1218.3
55	997.1	1008.6	1020.1	1031.5	1043.0	1054.5	1065.9	1077.4	1088.9	1100.4	1111.9	1123.4	1135.0	1146.5	1158.1	1169.6	1181.2	1192.8	1204.4	1216.1

Dynamic viscosity — cP (mPa·s)

°C \ wt%	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	40
15	1.175	1.214	1.253	1.295	1.338	1.385	1.435	1.490	1.550	1.616	1.689	1.772	1.865	1.969	2.086	2.217	2.364	2.525	2.701	2.892
20	1.036	1.071	1.108	1.146	1.186	1.230	1.276	1.326	1.381	1.441	1.509	1.584	1.668	1.762	1.868	1.986	2.118	2.262	2.419	2.588
25	0.922	0.954	0.988	1.023	1.061	1.101	1.144	1.190	1.241	1.296	1.358	1.427	1.504	1.590	1.686	1.793	1.912	2.041	2.182	2.333
30	0.826	0.856	0.888	0.921	0.956	0.993	1.033	1.076	1.123	1.174	1.231	1.295	1.365	1.444	1.532	1.630	1.737	1.855	1.982	2.118
35	0.746	0.774	0.804	0.834	0.867	0.902	0.939	0.979	1.023	1.071	1.123	1.182	1.247	1.320	1.401	1.490	1.589	1.696	1.812	1.935
40	0.678	0.704	0.732	0.761	0.791	0.824	0.858	0.896	0.937	0.981	1.031	1.085	1.146	1.213	1.288	1.370	1.461	1.559	1.665	1.777
45	0.620	0.644	0.670	0.697	0.726	0.756	0.789	0.824	0.863	0.904	0.950	1.001	1.058	1.120	1.190	1.266	1.350	1.440	1.537	1.640
50	0.569	0.592	0.617	0.642	0.669	0.698	0.729	0.762	0.798	0.837	0.880	0.928	0.981	1.039	1.104	1.175	1.252	1.336	1.426	1.520
55	0.525	0.547	0.570	0.594	0.620	0.647	0.676	0.707	0.741	0.778	0.819	0.864	0.913	0.968	1.028	1.095	1.167	1.245	1.328	1.415

Typical values

Ammonium sulfate solution properties at 25 °C

At 25 °C, 10 wt% ammonium sulfate has a density of about 1055.5 kg/m³ and a dynamic viscosity of about 1.061 cP. At 25 °C, 30 wt% ammonium sulfate has a density of about 1170.7 kg/m³ and a dynamic viscosity of about 1.686 cP. At 25 °C, 40 wt% ammonium sulfate has a density of about 1227.5 kg/m³ and a dynamic viscosity of about 2.333 cP.

Limitations

Before you use these numbers

▸Laliberte (2009) aqueous-electrolyte correlation for (NH4)2SO4-water, density and viscosity only: the published data set behind the correlation carries no heat-capacity coefficients for ammonium sulfate, so heat capacity is not tabulated rather than approximated. Tabulated for 2-40 wt% over 15-55 degC; saturation is nearly flat with temperature at about 42-44 wt%, so the whole table sits below saturation. Values are for preliminary design; verify against vendor data for critical service.
▸Values are tabulated only inside the 2–40 wt% and 15–55 °C ranges shown; the correlation is not extrapolated beyond them here.
▸Figures are for a pure ammonium sulfate–water system. Commercial grades contain impurities (for example chloride in some caustic grades) that shift density and viscosity; check the supplier's data sheet for a specific product.
▸Use for preliminary design; verify for critical service.

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