When to Use HPMC for putty powder？

Wall putty, AKA skim coat. It&#;s a material used for preparing and smoothing walls before painting. HPMC hydroxypropyl methyl cellulose is an essential additive in wall putty mixture.

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HPMC for wall putty works perfectly for both indoor and outdoor walls. It&#;s a drymix material where you mix all the ingredients first and then add water to it at construction site.

 

At WOTAIchem, our HPMC provides multiple benefits in wall putty application.

 

• High water retention and excellent workability for putty mortar.
• Extend the opening time, allowing you more time to apply.
• Fast dispersion in cold water, reducing your stirring time.

1.How much viscosity of HPMC generally used in Putty Powder ?

Answer:100,000 Viscosity for Putty Powder

• Cement mortar have a higher requirements ,150,000 Viscosity will be better .
• The most important role of HPMC is water retention ,and then thickening .
• For putty powder ,we need pay more attention on the water retention property In the condition of Viscosity lower than 100thousand ,the viscosity is larger, the relative water retention is better, but when the viscosity is more than 100 thousand, the influence of viscosity on the water retention is a little .

2.What is the Main Technical Data of hydroxypropyl methyl cellulose (HPMC)?

Answer: Hydroxypropyl content and Viscosity.

Higher Hydroxypropyl content generally means good water retention.High viscosity means good water retention, In cement mortar application we recommend high viscosity HPMC,Such as :150,000 to 200,000 Viscosity .

3.Which factors affect the gel temperature of hydroxypropyl methyl cellulose ?

HPMC gel temperature is related to its Methoxy Content, as the lower the methoxy content decrease , the gel temperature will increase .

4.The putty powder falls apart,is there any relationship with HPMC?

If you want to learn more, please visit our website HPMC for putty powder.

• Putty powder drop powder is mainly related to ash calcium quality, normally no relationship with HPMC.
• Lower Ash calcium content or ash calcium CaO, Ca(OH)2 ratio not correct, will cause powder drop.
• HPMC will not take participate any chemical reactions,but poor water retention of HPMC also will causes wall putty drop powder.

5.Why HPMC have a bad smell ?

Generally speaking,purity of HPMC is a kind of colourless and odourless white powder,but some HPMC have a bad smell ,what is the reason ?

When HPMC is produced by Solvent production method ,Toluene and isopropyl alcohol are normally used as solvents , in the final period of production, if not washed well ,the will be some pungent smell remaining.

6.How to choose the right hydroxypropyl methyl cellulose (HPMC) by application ?

• Putty powder: Normally requires a low Viscosity , 100 thousand is enough, the most important thing is good water retention.
• Cement and mortar: relatively high viscosity requirements, 150,000 Viscosity .
• Adhesive glue: Instant type of HPMC with High Viscosity :150,000~200,000
• Laundry detergent/ Shampoo:Instant type of HPMC with high viscosity :200,000

7.Why lot of bubbles in your putty powder?

HPMC in putty powder, thickening, water retention and construction of three roles. Not participating in any reaction.

• Too much water in the mixing ratio
• Scrap Wall putty in the condition that the bottom layer is not complete dry.

8.HPMC viscosity and temperature relationship?

Answer : The viscosity of HPMC is inversely proportional to temperature, that is to say,the viscosity increases with the decrease of temperature. When we talk about the viscosity of a HPMC product,we're talking about the viscosity tested in the condition of 2% aqueous solution at 20 degrees Celsius.

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