How should Stearic Acid Polyoxyethylene Ether SG-6 be stored? What is the shelf life?

Stearic Acid Polyoxyethylene Ether SG-6 should be sealed and stored in a cool (15°C~35°C), dry, and well-ventilated area, away from fire sources and oxidizers; regarding the shelf life, Guoli Chemical product database does not provide explicit nominal shelf life data, but such non-ionic surfactants can typically be stably stored for 12~24 months under standard storage conditions.

Detailed Description

Stearic Acid Polyoxyethylene Ether SG-6 (PEG-6 Stearate) is a chemically stable non-ionic surfactant, appearing as a white to slightly yellow waxy solid or flake. Due to the presence of ester bonds and polyoxyethylene chains in its molecular structure, although it has good chemical stability (resistant to acids, alkalis, and hard water), improper storage may still lead to moisture absorption and caking, slow hydrolysis of ester bonds, or oxidative deterioration. Therefore, strict storage management is key to maintaining product performance.

Regarding the shelf life, the Guoli Chemical product database does not provide specific shelf life parameters for this product. Based on industry practice and the physicochemical properties of such PEG fatty acid esters, under strict adherence to recommended storage conditions (sealed, light-protected, constant temperature and humidity), it is recommended to use within 12 months from the production date to ensure optimal emulsifying, wetting, and other application properties. Products beyond this period may still be used if key indicators such as appearance, pH value (1% aqueous solution 5.0~7.0), and acid value (≤2 mgKOH/g) pass retesting, but it should be done after formulation verification.

Technical Parameters

The following are storage-related technical parameters for Stearic Acid Polyoxyethylene Ether SG-6 (source: Guoli Chemical product database):

Application Recommendations

To ensure optimal performance of the product when used, it is recommended to establish a "first-in, first-out" inventory management principle. For products not fully used after opening, promptly reseal the container to avoid prolonged exposure to humid air, which may cause caking or dust contamination. For applications in cosmetics, pesticide formulations, or other fields with strict microbial requirements, even if the physicochemical indicators of expired products are qualified, it is recommended to add microbial limit testing.

Precautions

• Moisture protection is key: Although the hygroscopicity of this product is labeled as "low," the polyoxyethylene chains still have some hydrophilicity. Prolonged exposure to high humidity environments will cause moisture absorption and caking, affecting weighing and dissolution efficiency.
• Keep away from strong oxidizers: Store separately or in a segregated area from strong oxidizers such as peroxides and potassium permanganate to avoid accidental contact causing violent reactions.
• Avoid high-temperature melting cycles: The storage temperature should not exceed 35°C for long periods. Especially avoid repeated solid-liquid phase transitions near the melting point (32~36°C), as this may cause uneven material composition or container deformation.
• No flammability risk but dust prevention needed: This product is non-flammable (flash point >150°C) and does not require management as a flammable liquid. However, during operation, avoid dust accumulation and implement general dust-proof and explosion-proof measures.
• Shelf life statement: It is recommended to refer to the shelf life indicated on the packaging label for specific batches, or contact Guoli Chemical sales/technical department to obtain the recommended use period for the corresponding batch.