Plan a trial for your application
Personal care humectancy
In the same base at the target temperature, compare tack and stability.
Fragrance or formulation co-solvent
At the actual fragrance concentration, assess clarity, cold precipitation and odor.
Purchase specifications and incoming inspection
Review these properties when selecting and inspecting incoming material. Example figures refer to the cited grade or source. Confirm the offered specification, packaging and lead time in the quotation. Shell · USP monopropylene glycol technical information ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Propylene glycol assay | % by mass | Agree for the grade and end use | Specify 1,2-propanediol and the GC reporting basis. |
| Moisture | % by mass | Agree for the grade and end use | State the sampling and analytical methods. |
| Ethylene glycol and diethylene glycol | mg/kg | Agree for the grade and end use | Agree individual limits and quantification limits for the intended use. |
When approving a sample, record the grade, methods, limits and specification revision. On receipt, match the packing lot number to the lot-specific COA and record the measured values and release decision.
From samples to commercial delivery
Packaging and receiving
Specify industrial or relevant end-use grade. Receive liquids in clean, sealed containers.
Storage and handling
Require batch traceability and matching test reports. Confirm previous cargo before shipment.
Sample and order lead times
State receiving tank capacity or required drum size, trial quantity and destination. Ask for sample carriage, commercial MOQ, packaging charge, availability and expected warehouse delivery date.
Questions from the plant
Is principal-component purity sufficient for acceptance?
Specify water and individual impurities separately. Verify the grade for the intended use.
How should a formula that clouds at low temperature be investigated?
Compare fragrance loading, water content and temperature. Observe whether clarity returns on warming.
Report a delivery or batch issue
Include the order number, lot number from the package, label photos and inspection records for the affected lot. When retesting, check Propylene glycol assay, Moisture, Ethylene glycol and diethylene glycol.
Request documents for your application
TDS · Technical data sheet
For grade selection and sample approval, specify the grade and revision required.
SDS · Safety data sheet
Specify the country or region of use and the required language.
COA · Certificate of analysis
Request a sample COA during supplier review. For incoming inspection, provide the actual lot number.