To choose a safe desiccant, we must first understand what is a safe desiccant. For different industries and different products, the safety standards are different. In particular, there are many types of desiccant products on the market, such as molecular sieve desiccant, silica gel desiccant, mineral desiccant and other products, their physical properties and chemical properties are also different, I want to choose a safe and suitable one The product still needs careful consideration.
For example, the outer packaging of desiccant such as food, medicine, health care products and products are in direct contact, so the ink on the outer packaging of the desiccant must meet the requirements of medicinal or food grade. In addition to long-term indirect contact between the desiccant and such products, there is also the possibility of accidental ingestion, so when selecting the desiccant, you need to use silica gel desiccant. Because the silica gel desiccant uses the principle of physical moisture absorption, no chemical reaction will occur.
For example, military products, precision machinery or instruments contain a large amount of different types of metals, especially when they contain relatively active metals, to prevent chemical changes. Therefore, when choosing a desiccant for such products, you should choose a suitable desiccant product according to the metal substance of your product. You should consider the acidity and alkalinity of the desiccant and the type and content of the metal ions contained in it. Only in this way can chemical reactions be avoided. (Such as corrosion and rust).
Such as clothing, shoes and hats, bedding or other textiles, these are flammable or flammable items, to prevent the possibility of burning. Therefore, when choosing a desiccant for such products, pay attention to the temperature of the desiccant. If the desiccant will generate high temperature after moisture absorption is absolutely not allowed, the second is to note that the desiccant should not be corrosive to avoid direct contact. Corrosion occurs.
According to the analysis of the above three types of products, there are three main factors that affect safety: whether the product contains pathogenic or carcinogenic substances or toxins, the pH of the product, the type and content of metal ions contained in the product, the product Working temperature.
In addition, the selection of the desiccant should also take into account factors such as the storage period of the product itself, the storage environment, and the population that the product will eventually face. If the shelf life is long, you should choose a desiccant with a long moisture-proof effect. If the relative humidity in the storage environment is large, you should choose a desiccant with a large moisture absorption rate. If the product finally faces a group of young children and children, the adverse events that may occur after the desiccant is exposed to the targeted group should also be considered.