China Amines Co., Limited

A technical sheet for dimethylamine 40% aqueous solution may contain an assay range, a density value, and an appearance description.

These entries serve different purposes. Understanding how each value is defined helps buyers prepare clear purchase specifications and gives laboratories a consistent basis for incoming inspection.

Identify the role of each value

A typical property provides reference information about a product. An acceptance limit defines an agreed requirement used to evaluate supplied material.

Check the document headings, footnotes, and supplier explanations before assigning either role. A number printed on a technical sheet needs context: its unit, test conditions, method, and status within the supply agreement.

If a property is critical to your application, discuss a measurable requirement with the supplier.

Read assay ranges as product-specific requirements

The description “DMA 40%” identifies a nominal concentration. The approved specification should state the acceptable range.

For example, Thermo Scientific publishes a 39.0–41.0% assay range, measured by aqueous acid-base titration, for one of its DMA 40% products. This is a specification for that named grade.

Use your agreed limits when reviewing a shipment, then compare them with the batch result reported on its COA.

Keep physical properties with their conditions

Density illustrates why conditions matter. Sigma-Aldrich lists 0.89 g/mL at 25°C for its nominal 40 wt.% dimethylamine solution. The temperature belongs with the value whenever it is recorded or used.

For quantity conversions, confirm that the density applies to the supplied grade and measurement temperature. Ask whether the value is reference data or a parameter controlled under the purchase specification.

Make the purchasing specification clear

For every agreed quality parameter, record the requirement, unit, and relevant test method. Include test conditions where they affect interpretation.

Keep the specification revision identifiable, and agree on how results near a limit will be assessed before shipment. This gives purchasing, supplier quality, and the receiving laboratory the same reference.

Discuss your DMA 40% quality requirements

Send China Amines Co., Limited your application, required specification, quantity, packaging preference, and destination.

Highlight the properties that affect your acceptance decision so the proposed supply can be reviewed against clear requirements.

Inquiries: info@chinaamines.com

Technical references

• Thermo Scientific — Dimethylamine, 40% w/w Aqueous Solution: Product Specification
• Sigma-Aldrich — Dimethylamine Solution 40 wt.%: Physical Properties and Product Data