|
Test |
Standard |
Reference |
| Color, pt-co | Max 25.0 | ASTM D1209 |
| Viscosity at 98.9˚C, cSt | 6.8‐8.0 | USP41‐NF36 |
| pH, 5% Solution | 4.5-7.5 | USP41‐NF36 |
| Residue on ignition, %wt | Max 0.1 | USP41‐NF36 |
| Assay (Average Molecular Weight), g/mol | 380‐420 | USP41‐NF36 |
| Water, percent | Max. 2.0 | ASTM E203 |
Polyethylene Glycol 400
HS Code: 39072090
Polyethylene glycols (PEGs) are condensation polymers of ethylene oxide and water, with the general formula H(OCH₂CH₂)ₙOH. They are the most commercially important type of polyether. Low molecular weight PEGs (up to 700) are colorless, odorless, viscous liquids with freezing points as low as -10°C (for diethylene glycol). In contrast, PEGs with a molecular weight greater than 1,000 are wax-like solids, with melting points up to 67°C for n = 180.
PEGs of different molecular weights have varying physical properties (e.g., viscosity) due to differences in chain length, but their chemical properties are nearly identical across the range.
