All questions about Hydroxypropyl Methylcellulose(HPMC), all here!
4.How to determine the quality of hydroxypropyl methyl cellulose (HPMC) in a simple and intuitive way?
–A: (1) Whiteness: Whiteness does not determine whether HPMC is good or not, and if whitening agents are added in the production process, it will affect its quality. However, most of the good products have good whiteness.
(2) Fineness: HPMC 80 mesh and 100 mesh, 120 mesh is less common. The finer the fineness, the better it is in general.
(3) Transmittance: put HPMC into water and look at its translucency after forming a transparent colloid. The greater the transmittance, the better, which means less insoluble matter. The transmittance of vertical reactors is generally good, while that of horizontal reactors is worse.
(4) Specific gravity: The greater the specific gravity, the heavier it is, the better it is. The higher specific gravity is generally due to the high hydroxypropyl content inside. High hydroxypropyl content, then the water retention to be better.
5. What is the amount of hydroxypropyl methylcellulose (HPMC) in putty powder?
–A: The amount of HPMC used in practice varies depending on the climate, temperature, quality of the local calcium grey, the formulation of the putty powder and the “quality required by the customer”. In general terms, between 4 kg and 5 kg.
6. What is the appropriate viscosity for HPMC?
–A: 10W is sufficient for putty powder, but 15W-20W is required for mortar. The most important function of HPMC is to retain water and only secondarily to thicken. As long as the water retention is good and the viscosity is low (70-80,000), it is possible to use it in putty powder. Of course, a higher viscosity is better for water retention.
7.What are the main technical indicators of hydroxypropyl methyl cellulose (HPMC)?
–A: Hydroxypropyl content and viscosity, most users are concerned about these two indicators. The high content of hydroxypropyl, water retention is generally better. If the viscosity is high, the water retention is relatively (not absolutely) better, and if the viscosity is high, it is better to use in cement mortar.