• • Blog
• March 30th 2026

What are the effects of hydroxypropyl methylcellulose (HPMC) in wall putty powder?

First, we need to understand the properties of hydroxypropyl methylcellulose to understand its role in the industrial field. HPMC has a fineness of around 100 mesh, and these fine particles dissolve easily in water, exhibiting strong water retention, high transparency, and good binding properties. Therefore, it is widely used in the construction industry. So, what are the effects of hydroxypropyl methylcellulose in putty powder?

1. Application of Hydroxypropyl Methyl Cellulose HPMC in wall Putty Powder

Adding hydroxypropyl methylcellulose to putty powder increases its viscosity, allowing the cellulose to thicken the solution and maintain a uniform consistency, improving resistance to sagging. It also has water-retention properties, slowing down the drying process of the putty powder and facilitating the chemical reaction of lime in water. In terms of construction, cellulose has a lubricating effect, improving the workability of the putty powder and making it easier to apply.

2. Dosage of Hydroxypropyl Methyl Cellulose HPMC in wall Putty Powder

The appropriate amount of hydroxypropyl methyl cellulose (HPMC) to add to putty powder before construction varies depending on factors such as climate, environment, temperature, and the quality of local lime. Therefore, a fixed dosage cannot be provided. Due to geographical differences between northern and southern my country, climates and environments differ, leading to variations in usage. We can only provide a rough estimate: generally, the dosage of HPMC in wall putty powder is between four and five kilograms. In northern regions, a slightly higher dosage (over five kilograms) is recommended, while in southern regions, a slightly lower dosage (under four kilograms) is preferable.

3. Suitable Viscosity of Hydroxypropyl Methyl Cellulose

The standard viscosity for putty powder is generally around 100,000, while the requirement for mortar is relatively higher, around 150,000. Because HPMC has water-retaining properties, it requires appropriate thickening. Therefore, when adding hydroxypropyl methylcellulose to putty powder, a lower viscosity is generally sufficient, typically around 80,000. If the viscosity exceeds 100,000, it will affect the water retention performance, resulting in poor water retention during construction and making the process more difficult.

Adding hydroxypropyl methylcellulose to putty powder often causes air bubbles. This is a common problem encountered by many construction workers. This is due to the addition of a large amount of cold water at once. Even during construction, if a new layer is applied before the base layer is dry, air bubbles are easily formed. Therefore, it is crucial to pay attention to details and strictly follow the construction requirements to achieve the desired results.

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