Polyoxyethylene stearate SG-40 (PEG-40 stearate) is a white to pale yellow waxy solid at room temperature, with a melting point between approximately 30-40°C. Therefore, temperature control is key to storage: excessive temperature (above 35°C) may cause the product to melt and cake, affecting performance; too low temperature (below 5°C) may cause solidification and deterioration. It is recommended to store the product in a constant-temperature warehouse to avoid drastic temperature fluctuations.
This product is a nonionic surfactant with a certain degree of hygroscopicity. If not sealed promptly after opening, it will absorb moisture from the air, potentially causing surface deliquescence or caking. Therefore, the container must be resealed immediately after each use. Use the original packaging or compatible containers made of stainless steel or plastic for storage.
| Storage Factor | Specific Requirement |
|---|---|
| Temperature Range | 5°C ~ 35°C (to prevent melting at high temperature or solidification at low temperature) |
| Environmental Conditions | Cool, dry, well-ventilated, away from heat sources, flames and direct sunlight |
| Container Requirements | Keep tightly closed; use stainless steel or plastic containers; reseal after opening |
| Incompatible Substances | Avoid storage with strong oxidizers (such as peroxides, perchlorates, etc.) |
| Shelf Life | 12 months (from production date); expired product should be re-tested to determine usability |
In actual use, if the product solidifies or crystallizes due to low temperature, it can be naturally warmed in a 20-30°C environment. Never heat directly with an open flame or high-temperature steam, to avoid localized overheating that may damage the product structure. If slight melting and caking occur due to high temperature, it does not affect the intrinsic quality; after cooling, it can be crushed and used. For bulk storage, it is recommended to follow the "first in, first out" principle and periodically check the integrity of packaging and the appearance of the product.