How to buy good quality of hydroxypropyl methyl cellulose hpm
How to buy good quality of hydroxypropyl methyl cellulose hpmc ? how to distinguish the qualtiy of HPMC cellulose if you don't have practical experience?
First we can check from the vision.
1,whiteness--usually the good quality of hpmc looks more whiteness , but the whiteness is not the deciding factor , we need to comprehensive consideration .
2,fineness--the hpmc celluse usually can through 80 mesh and 100 mesh fineness , 120 mesh relatively small , 120 mesh very fine.
3,light transmittance: put HPMC into water to form a transparent gel and observe its transparency.The higher the transmittance, the less insoluble the material.
4,specific gravity: the greater the specific gravity, the greater the weight.
Larger proportion, generally due to higher hydroxypropyl content, and higher hydroxypropyl content, better water retention effect.
Secend we can use the principle of physical reaction to justify good or bad quality of hpmc .
There are two types of hydroxypropyl methylcellulose , fast dissolving type and hot dissolving type.
fast dissolving type disperse quickly in cold water and disappear in water .in this time the liquid has no viscosity , because HPMC is only dispersed in water , there is no real dissolution .after about 2 minutes , the liquid viscosity gradually increased, forming a transparent viscous gel.
hot dissolving type , in the case of cold water, can be rapidly dispersed in hot water, disappear in hot water, until the temperature drops to a certain temperature, viscosity slowly appear, until the formation of transparent viscous gel.Hot melt putty can only be used in powder and mortar, liquid glue and paint, there will be caking phenomenon, can not be used.
It can be used in a wide range of applications, in putty powder and mortar, as well as liquid glue and coating.There are no contraindications.
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www.chinahpmccellulose.com
