Polyethylene glycol PEG-2000 is a white to slightly yellowish waxy solid or flake with slight hygroscopicity. Therefore, the core of storage lies in moisture-proof, high-temperature proof, and contamination prevention. The product is chemically stable at room temperature, but if exposed to a humid environment for a long time, it will absorb moisture from the air, leading to caking and even affecting subsequent use performance. If the storage temperature exceeds the melting point (about 50–55°C), the product will melt. Although it can return to solid state after cooling (with thermal reversibility), repeated melting and solidification may affect appearance uniformity.
According to the safety data sheet of Guoli Chemical, the recommended storage temperature range is 5–30°C. The container must be kept sealed. Unused product after opening should be resealed promptly to prevent moisture absorption and foreign matter contamination. The recommended container materials are stainless steel, aluminum, or carbon steel containers lined with plastic. Long-term contact with iron containers should be avoided to prevent trace iron ions from affecting the product color.
Regarding the shelf life, the Guoli Chemical product database currently does not specify a specific shelf life value for this product. According to industry practice, polyethylene glycol PEG-2000, under sealed, cool, and dry compliant storage conditions, typically has a shelf life of 2 years from the date of manufacture. It is recommended that users refer to the expiration date indicated on the product packaging label or the Certificate of Analysis (COA). Products beyond the shelf life should be re-tested and can only be used after confirming that all indicators meet the specifications.
| Storage Element | Specific Requirement |
|---|---|
| Temperature | 5–30°C, avoid high temperature and low temperature freezing |
| Humidity | Keep dry, prevent moisture absorption |
| Light | Avoid direct sunlight |
| Container | Sealed packaging, recommended stainless steel, aluminum, or carbon steel containers lined with plastic |
| Environment | Cool, dry, well-ventilated warehouse |
| Isolation Requirements | Keep away from strong oxidizers, strong acids, strong bases; keep away from heat sources, ignition sources; keep away from food, feed, and drinking water sources |
In actual use, if PEG-2000 needs to be frequently accessed, it is recommended to divide into small packages for one week's usage to reduce the risk of moisture absorption from frequent opening of the main package. In winter at low temperatures, the product is solid. Before use, it can be placed in a 40–50°C water bath or warm room to slowly soften. Do not use open flames or steam for direct heating to avoid local overheating causing quality changes. Products that have been melted and then solidified and remelted generally do not affect performance, but repeated thermal cycles may cause slight discoloration.