How to store polyethylene glycol PEG-300? What is the shelf life?

PEG-300 should be stored in a cool, dry, well-ventilated warehouse, with a recommended temperature of 5°C to 40°C, keeping the container sealed and moisture-proof; under compliant storage conditions, the shelf life is typically 2 years (subject to the product's COA).

Detailed Explanation

Polyethylene glycol PEG-300 is a chemically stable non-ionic polymer, but its molecular structure contains numerous ether bonds and terminal hydroxyl groups, giving it strong hygroscopicity. Therefore, the key points for storage are moisture prevention, sealing, avoiding high temperatures, and keeping away from incompatible substances. This product is not classified as hazardous, has no risk of flammability or explosion, and storage management is relatively simple, but basic chemical storage regulations must still be followed.

Regarding shelf life, PEG-300 has long-term chemical stability under ideal storage conditions. Industry practice indicates that unopened PEG-300 under compliant storage conditions typically has a shelf life of 2 years (from the production date). The specific shelf life should be based on the product's certificate of analysis (COA) and packaging label. After opening, it is recommended to use it as soon as possible and reseal immediately after each use to minimize the impact of moisture absorption on product quality.

Storage Condition Details

Shelf Life and Quality Maintenance Recommendations

Specific shelf life parameters for PEG-300 are not currently included in the database. Based on common industry practices and the chemical characteristics of polyethylene glycol products, the following recommendations are provided:

• Unopened Product: Under the storage conditions described above, the shelf life is typically 2 years from the production date. It is recommended to manage inventory using the "first-in, first-out" principle.
• Opened Product: Due to increased moisture absorption risk after opening, it is recommended to use within 6 to 12 months. After each use, ensure the container is sealed and check the opening for any crystallization or contamination.
• Quality Anomaly Detection: If the product shows significant color darkening, turbidity, off-odor, stratification, or significant viscosity changes, discontinue use and perform quality retesting.

Precautions

• PEG-300 is hygroscopic; prolonged exposure to humid air will cause moisture absorption and dilution, affecting subsequent formulation accuracy.
• At low temperatures in winter, the product's viscosity increases or may even solidify; this is a normal physical phenomenon. Before use, slowly warm it to 20°C~40°C and stir evenly. Do not use direct open flame heating.
• In case of leakage, small amounts can be covered and absorbed with inert adsorbent materials (e.g., sand, vermiculite) then sealed for disposal; large leaks should be contained with dikes to prevent entry into sewers and water bodies.
• For the shelf life, storage conditions, and retest intervals of specific batches, refer to the certificate of analysis (COA) issued by the manufacturer (Guoli Chemical).