Span S-40 (sorbitan monopalmitate) is a chemically stable nonionic surfactant that does not polymerize or decompose at room temperature. According to the official safety data sheet from Guoli Chemical, the core storage requirements are cool, dry, sealed, and ventilated. The product is a pale yellow waxy solid (melting point 45~47°C), and the storage temperature must be strictly below 35°C; otherwise, softening and caking may occur, affecting performance.
Regarding shelf life, the product database does not provide an exact expiration date. Based on industry practices for nonionic surfactants and the chemical stability of span products, under sealed original packaging and recommended storage conditions, the typical shelf life is 24 months (2 years). It is recommended to follow the "first-in, first-out" principle and conduct annual re-inspection of key indicators such as appearance and acid value for inventory; if qualified, continued use is acceptable.
The product is packaged in 25 kg woven bags or kraft paper bags. After opening, reseal tightly to prevent moisture absorption. Span S-40 has low hygroscopicity (moisture ≤1.5%), but prolonged exposure to high humidity environments should still be avoided to prevent excessive moisture from affecting emulsification performance.
| Parameter | Value |
|---|---|
| Appearance | White to light yellow waxy solid |
| Melting Point | 45~47°C |
| Moisture | ≤1.5% |
| Flash Point | >200°C |
| Active Content | ≥99% |
| Chemical Stability | Stable at room temperature, avoid strong acids and bases |
| Hygroscopicity | Low |
| Packaging | 25 kg woven bag/kraft paper bag |
| Recommended Storage Temperature | Below 35°C |
| Shelf Life (Recommended Conditions) | 24 months (industry general reference value) |
To ensure stable product performance, it is recommended to follow these storage management measures:
Span S-40 is not resistant to strong alkali; avoid contact with strong alkaline substances in storage and use environments. Although the product is practically non-toxic (rat acute oral LD₅₀ >10 g/kg), it is still recommended to wear gloves and protective goggles during handling. If the product shows significant color darkening, unusual odor, or severe caking, discontinue use and contact the supplier for quality confirmation. The above shelf life is a general industry reference value; please refer to the expiration date on the Guoli Chemical factory quality inspection certificate for accuracy.