What is indicator silica gel？
Issuing time:2022-11-04 17:53
Color-changing silica gel is an indicator-type adsorbent with high added value and high technical content, which is made of fine-pored silica gel with high active adsorption material as the basic raw material. It is a high-grade adsorption desiccant. Blue gel indicator, color-changing silica gel and cobalt-free color-changing silica gel" HG/T 2765.4-2005.
The general production method of this product at home and abroad is to use fine-pored silica gel (pore size 2-3nm, specific surface area above 600㎡/g) as the carrier, and use cobalt chloride (molecular formula: CoCl2) to combine with the silica gel through certain process steps. on the surface of the pores.
Blue silica gel is divided into blue gel indicator, color-changing silica gel and blue gel. The appearance is blue or light blue glass-like particles. According to the particle shape, it can be divided into spherical and block shapes. characteristics of red. This product is spherical or irregular-shaped particles. It is divided into three types: purple, orange-red or yellow according to different appearances. Its main component is silicon dioxide, and its color changes with different humidity.
1. It is mainly used for moisture absorption and rust prevention of instruments, meters, equipment, etc. under airtight conditions, and at the same time, it can intuitively indicate the relative humidity of the environment by changing its color from blue to red after moisture absorption.
2. Use with ordinary silica gel desiccant to indicate the degree of moisture absorption of the desiccant and judge the relative humidity of the environment.
3. As a silica gel desiccant for packaging, it is widely used in precision instruments, leather, shoes, clothing, household appliances, etc.
The main component of color-changing silica gel is cobalt chloride, which is highly toxic and has a strong adsorption effect on water vapor in the air. The blue color before moisture absorption gradually changes to light red with the increase of moisture absorption.
Article classification: What is indicator silica gel？