CMC is odorless and tasteless white or cream-fine powder. The viscosity of Sodium CMC rises rapidly below 20℃; The change in viscosity is slower at 45℃; The viscosity and performance of CMC decrease significantly when the temperature is above 80℃. It is very stable in alkaline solution but is easy to hydrolyze in acid environment. When the pH value is 2-3 or it is in contact with polyvalent metal salt, precipitation will occur. CMC is easy to disperse in water into transparent gelatin solution, and is insoluble in ethanol and other organic solvents.
Some customers may find it challenging when dissolving CMC. Below are some of the tips when dissolving CMC in water for your reference.
Firstly, add a certain amount of clean water into the mixing tank with a stirring device. Then turn on the stirring device and slowly and evenly scattered CMC into the mixing tank. Keep stirring so that CMC and water are completely integrated and CMC is fully dissolved. The reason why we need to evenly scatter CMC and keep stirring is to prevent CMC from clumping and caking when it meets with water. This could also improve the dissolving rate of CMC. The stirring time is normally much shorter than the time CMC completely dissolves.
The basis for determining the stirring time is when CMC is evenly dispersed in water with no obvious large lumps. The stirring speed is generally between 600-1300RPM, and the stirring time is usually controlled within about an hour.
The time required for the complete dissolution of CMC can be determined based on the following aspects:
(1) CMC is completely bonded to water, and there is no solid-liquid separation between CMC and water;
(2) The mixed glue is in a uniform state, and the surface is smooth;
(3)The mixed glue is close to transparent with no granular substance. It takes about 10-20 hours from the time CMC is put into the mixing tank to CMC is completely dissolved.
If you would like to get more information about Sodium CMC, please feel free to contact us.
SINOCMC TEAM