Color-changing Silica Gel, also called Blue Gel is a kind
of high tech and valued indicating adsorbent which is made
from high active adsorbent--Narrow Pore Silica Gel, it
belongs to high class desiccant. Now the State Standard is
widely used in China, [Refer to Blue Silica Gel Indicator
& Color-changing Silica Gel, HG/T2765.4-1996.] The usual
processing method in the world is to combine Narrow Pore
Silica Gel (Pore Diameter: 2-3 nm, Surface Area:
600m2/g <= ) with chloride cobalt (CoCl2). The main feature
of Blue Silica Gel is that it has high adsorption capacity
of steam in the air, and change its color from blue to
purple alone with the water increasingly adsorbed.
The total output of Blue Silica Gel is above 6000Mt per
year in China, in which about 70%-80% Blue Gel is exported
. 8 million US Dollar will be earned by this product. Now
people put more and more attention on environment
protection problem, some chemical product pollutions are
taken seriously by the people in different countries,
chloride cobalt is considered to be one of the carcinogen
(cancer causing) material in the developed countries.
China is one of the major indicating silica gel exporting
countries, so it is a great job that whether we can
develop a new indicating gel product in a short time. The
technicians in our company, after half a year''s hard work,
have already developed a new Blue Gel replacer-- Orange
Silica Gel Indicator or Non-cobalt indicating Silica Gel.
The new product has more advantages than the Cobalt Blue
Silica Gel, for example, Orange Silica Gel has a higher
adsorption capacity than the old one when it adsorbs
water. This is a totally new method in the indicating
silica gel manufacture in the world. because the new
product color is different from Blue Gel, we have set
up a new factory standard.