What is the relationship between the "flour quality" of putty powder and HPMC?

If putty powder is compared to flour, HPMC is like adding a smart assistant to flour - it does not change the fineness of the flour itself, but makes the dough kneading process smoother!

1. Who determines the real "flour quality"?

Aggregate fineness: The finer the main filler calcium carbonate (like baby powder), the finer the finished product

Basic material: Gypsum-based is naturally more "silky" than cement-based

Processing technology: Good grinding equipment is equivalent to top-level stone mills, and the ground powder is naturally uniform

2. What can HPMC, this "smart assistant", do?

Glue function: Keep the putty paste at the proper viscosity, and it will be like applying butter without powder flying when scraping the wall

Water-locking magic: Delay the evaporation of water to prevent the wall from cracking like dry land

Smooth buff: It feels like chocolate sauce during construction, and it is easy to apply a smooth surface

3. It seems to have no direct relationship, but it is actually hidden

Although HPMC cannot turn coarse powder into fine powder, it can:

Reduce the powder loss during construction (visually delicate)

Prevent drying shrinkage cracks (smoother touch)

Improve the smoothness of scraping and coating (smoother operation)

Finally, the wall effect "looks + feels" more advanced

4. Pay attention to the "sweet spot" of dosage

Just like adding salt to cooking, adding too much HPMC is a bad thing:

Excessive amount will turn into a "glue wall": difficult to scrape and sticky to the knife

Excessive amount will become "slow-drying paste": delaying the construction period is very frustrating

Golden ratio: usually 0.3%-0.5% of the formula, depending on the construction environment

Summary in one sentence:

Good putty = high-quality aggregate (hardware) + suitable HPMC (software), the combination of the two can produce a baby-like wall effect!