Span S-60 (Sorbitan monostearate) is a chemically stable nonionic surfactant. Proper storage is crucial for maintaining its core properties such as emulsification and dispersion. Its waxy solid physical form makes it somewhat sensitive to temperature, humidity, and light. Improper storage may lead to caking, color deepening, or increased acid value, thereby affecting the formulation performance.
According to the safety data sheet (SDS) provided by Guoli Chemical, the product should be stored in a cool, dry, and well-ventilated place, and the container must be kept tightly sealed to prevent moisture absorption and contamination. The original packaging is usually a woven bag or kraft paper bag lined with polyethylene. If not used up after opening, the inner bag mouth should be tightly tied. The product should be kept away from incompatible substances such as strong oxidizers and should comply with the stacking layer limits on the packaging to prevent damage to the bottom packages due to pressure.
| Storage Condition Item | Specific Requirement |
|---|---|
| Storage Environment | Cool, dry, well-ventilated |
| Suitable Temperature | Below 35°C (may solidify at low temperatures, allow to return to room temperature before use) |
| Light Requirement | Avoid direct sunlight |
| Package Sealing | Keep container tightly sealed; tie inner bag mouth after opening |
| Substances to Avoid | Strong oxidizers (e.g., high-concentration peroxides, hypochlorites) |
| Shelf Life | No accurate data in database |
In applications with high safety requirements such as cosmetics, food, and pharmaceuticals, it is recommended to follow the strict "first in, first out" inventory management principle. For products stored long-term, sample and test key indicators before use, such as acid value (specification limit ≤10 mgKOH/g), saponification value (145~160 mgKOH/g), and hydroxyl value (230~270 mgKOH/g). Ensure these parameters are still within the acceptable range before using in large-scale production to guarantee the stability of the final product quality.