According to the product data of Guoli Chemical, the storage of Span S-20 coconut acid (sorbitan monolaurate/CAS:1338-39-2) needs to comply with the following requirements: Store in a cool, dry, well-ventilated warehouse, away from heat sources and open flames. Keep containers tightly sealed to prevent moisture or foreign matter contamination. Avoid storing together with strong oxidizers, strong acids and other incompatible substances.
The recommended storage temperature is 5–40°C, with special attention to prevent repeated freeze-thaw cycles to avoid affecting the product's emulsifying performance and quality stability. This product is chemically stable and maintains good performance under normal temperature and pH conditions, but may undergo hydrolysis under strong acid or strong alkali environments.
Regarding the shelf life, the specific shelf life of this product is not directly listed in the Guoli Chemical product database. However, based on the chemical stability of this product (stable at normal temperature and pressure, non-flammable, not classified as dangerous chemical) and industry practice, under the above storage conditions and with intact packaging, the shelf life of unopened Span S-20 coconut acid is typically 2 years. This period is based on industry standard recommendations, not directly marked data from the product database.
It is recommended that users prioritize use within 2 years after the production date. If the product is opened, seal it promptly and store in a dry place. If obvious changes in appearance (color, viscosity, transparency) or performance are observed, discontinue use.
| Parameter | Specification |
|---|---|
| Appearance | Light yellow to amber viscous liquid |
| Active content | ≥98% |
| Moisture | ≤1.5% |
| pH value (1% dispersion) | 5.0-7.0 |
| Acid value | ≤7.0 mgKOH/g |
| Saponification value | 155~175 mgKOH/g |
| Hydroxyl value | 290~360 mgKOH/g |
| HLB value | 8.6 |
| Flash point | >150℃ |
| Density (25°C) | Approx. 1.00-1.05 g/cm³ |
| Kinematic viscosity (25°C) | Approx. 4000 mm²/s |
| Chemical stability | Stable under normal temperature and pH; may hydrolyze in strong acids or alkalis |
| Packaging specifications | 50kg/200kg plastic drums |
Span S-20 coconut acid, as a non-ionic W/O emulsifier, is widely used in personal care products (skin creams, make-up, shampoo and hair care products) and industrial fields (pesticide emulsification, metalworking fluids, paints and inks, etc.). If the stored product becomes cloudy or separates due to low temperature before use, it is a normal physical phenomenon. Restoring to room temperature and gently stirring can restore uniform state without affecting performance.
It is recommended to establish a first-in-first-out inventory management system to ensure reasonable use within the shelf life.