Hydroxypropyl methyl cellulose can be used in putty with a viscosity of 100,000, while the viscosity requirement for cement mortar is relatively high, which should be 150,000. Hydroxypropyl methyl cellulose plays an important role in maintaining moisture and thickening. Therefore, in wall putty, as long as water retention is achieved, the viscosity will decrease. Generally speaking, the higher the viscosity, the better the water retention, but when the viscosity exceeds 100,000, the viscosity does not have a great impact on the water retention.

Decorative building materials grade hydroxypropyl methyl cellulose can generally be divided into the following categories based on viscosity:

1. Low viscosity: 400 viscosity cellulose ether mainly be used in self-leveling mortar.

It has low viscosity and good fluidity. After addition, the water retention performance of the surface layer is controlled, the bleeding rate is not obvious, the shrinkage is small, cracking, anti-sedimentation, and the fluidity and pumpability are improved.

2. Low and medium viscosity: 20,000-500,000 viscosity cellulose mainly used in plaster of paris products and caulking materials. Low viscosity, high water retention, good workability, and low water flow.

3. Light to medium viscosity: mainly used for interior and exterior wall putty, skim coat, with a viscosity between 75,000-10,000. Moderate viscosity, good water retention, and good construction drape.

High viscosity: Mainly used in external thermal insulation system mortar EIFS/ETICS.

4. Cement mortar has high viscosity and high water retention, which makes it less likely to fall and make dents, thereby improving engineering construction.

Generally speaking, the higher the viscosity of hydroxypropyl methylcellulose, the better the water retention. Therefore, in order to reduce the increase in volume and cost, many consumers will choose to use low- and medium-viscosity cellulose (75,000-10,000) instead of medium- and low-viscosity cellulose.

KDOCEL HPMC medium-viscosity cellulose ether HPMC (75,000-10,000) is avaliable in modified type and non-modified type, our online technicial servise will offer the professional suggestions by your detailed applications.