Dimethylamine Solution Density: From Litres to Kilograms

Your purchasing order specifies kilograms, the receiving tank displays litres, and the warehouse spreadsheet contains a density copied from an older delivery.

All three records may look reasonable. They still need a common measurement basis.

For dimethylamine aqueous solution, converting volume to mass requires density data appropriate to the product concentration and temperature. Treating every liquid as water makes the arithmetic easier—but can make the inventory less accurate.

Use density for the correct aqueous grade

The basic relationship is:

Solution mass = solution volume × solution density

When volume is expressed in litres and density in kilograms per litre, the result is kilograms.

However, “DMA density” is an incomplete description. Confirm whether the figure refers to:

• an aqueous solution or anhydrous dimethylamine;

• the concentration being purchased;

• the relevant temperature;

• a typical reference value or a measured result.

Manufacturer technical data sheets report density separately for different aqueous DMA grades and identify the reference temperature.[1][2] A density value for one grade should therefore not be transferred automatically to another.

An anhydrous DMA density chart is also not a substitute for aqueous-solution data.

Keep volume and density on the same temperature basis

Liquid volume can change with temperature. For a closed quantity of material with no gain or loss, that volume change does not represent a corresponding change in mass.

This matters when a tank reading is taken at one temperature while the density used in the calculation refers to another.

Before converting, establish whether the recorded volume is:

• the observed volume at the measurement temperature; or

• a volume already corrected to a stated reference temperature.

Then use compatible density information. If a temperature correction is required, obtain suitable product data and an agreed calculation method rather than borrowing a correction factor from another chemical.

Work through a clearly labelled example

Assume the following hypothetical values solely to demonstrate the calculation:

The calculated solution mass is:

5,000 L × 0.880 kg/L = 4,400 kg

The density in this example is not a China Amines specification and is not assigned to a particular DMA concentration.

For unit conversion, 1 g/cm³ equals 1 kg/L, while 1 m³ equals 1,000 L. Keeping those units visible in the spreadsheet helps prevent a misplaced factor of one thousand.

Separate solution mass from contained DMA

A volume-to-mass calculation gives the mass of the whole solution.

Calculating contained dimethylamine requires a second input: the DMA mass fraction on the agreed reporting basis.

Keep these quantities in separate spreadsheet fields:

Solution volume → solution mass → contained DMA mass

This makes it easier to reconcile purchasing quantities, raw-material inventory and production consumption without confusing tonnes of solution with tonnes of DMA.

Distinguish net mass from gross weight

A vehicle or loaded package weight includes more than the chemical.

Where weighing is the agreed quantity basis, net product mass is determined from the relevant gross and tare measurements under a consistent weighing procedure. Confirm what each ticket includes before comparing it with a calculated tank quantity.

A volume-based estimate, a weighbridge record and a package net-weight declaration should retain their measurement basis. Investigate differences before changing the inventory figure.

Include the quantity basis in your DMA inquiry

When contacting China Amines Co., Limited about dimethylamine aqueous solution, specify the concentration, required net mass, destination and receiving arrangements.

If your site plans deliveries by tank volume, request appropriate density information with its reference temperature. Confirm the contractual quantity basis and the supporting shipment records before dispatch.

Inquiries: info@chinaamines.com
Website: https://www.chinaamines.com/

Technical references

[1] Eastman — Dimethylamine 40% Aqueous Solution Technical Data Sheet:
https://productcatalog.eastman.com/tds/ProdDatasheet.aspx?product=71103577

[2] Eastman — Dimethylamine 60% Aqueous Solution Technical Data Sheet:
https://productcatalog.eastman.com/tds/ProdDatasheet.aspx?pn=&product=71103583