Questions about You Should Know about HPMCMarch 23rd 2023
Gypsum-based putty powder(Wall Putty/Skim Coat) mainly uses hemihydrate gypsum (building gypsum) as the main inorganic gel material,with heavy calcium, gray calcium,supplemented by Redispersible polymer powder RDP,Hydroxypropyl methyl cellulose HPMC and other polymer additives like Polyvinyl alcohol PVA mixed according to scientific formula. Gypsum-based putty powder has the characteristics of strong adhesion,good leveling and ash filling performance,high strength, small deformation coefficient,stable and non-cracking,and due to the properties of gypsum itself,it can have good sound insulation performance,respiratory function and tone. Wet function,etc. Gypsum-based putty powder is generally used for leveling construction of the bottom layer of the wall.
Gray-calcium-based putty powder(Wall Putty/Skim Coat) mainly uses gray calcium as inorganic gel material,heavy calcium as filler, supplemented with Redispersible polymer powder RDP,Hydroxypropyl methyl cellulose HPMC and other polymer additives like Polyvinyl alcohol PVA,mixed according to scientific formula.With the improvement of living standards,the demand for wall decoration quality and home comfort is increasing.The problem of yellowish color of gypsum-based putty powder is gradually enlarged.Because of its yellowish color,the whiteness of the paint on the wall is never As expected,more and more people are paying attention to the water resistance of putty powder,and the gypsum-based putty powder is poor in water resistance.The putty powder with gray calcium powder as inorganic cementing material has relatively high whiteness,which satisfies people’s demand for more beautiful wall decoration,and the gray calcium-based putty powder has high strength,good water resistance and long service life. The ash-calcium-based putty powder is generally scraped on top of the plaster putty and used as a surface putty material.
Cement-based putty powder(Wall Putty/Skim Coat) mainly uses cement (white cement) as inorganic gel material,with heavy calcium and gray calcium,supplemented by various polymer additives such as Redispersible polymer powder RDP,Hydroxypropyl methyl cellulose HPMC and other polymer additives like Polyvinyl alcohol PVA formulated together.The cement-based putty powder has the characteristics of good water resistance,strong weather resistance, high strength and strong adhesion,but the cement-based putty powder is rough and difficult to be polished, and the decorative effect is poor.Generally,the cement-based putty powder is used for the outer wall.Gypsum-based putty powder and ash-calcium-based putty powder are used for interior walls.