The unique whiteness and density of good putty make the coating adhesion and coverage per unit area 25-30% less than that of walls with ordinary putty. It is easy to construct and polish and has a certain coverage. The bad putty needs to be scraped very thick and uses a lot of materials.

3．刮劃墻面

3. Scratch the wall

《建筑室內(nèi)用膩?zhàn)印窐?biāo)準(zhǔn)對(duì)膩?zhàn)拥膹?qiáng)度有了明確規(guī)定，普通膩?zhàn)拥臉?biāo)準(zhǔn)狀態(tài)粘結(jié)強(qiáng)度大于0．25MPa，對(duì)浸水后的強(qiáng)度沒(méi)有要求，而耐水膩?zhàn)右髽?biāo)準(zhǔn)狀態(tài)粘結(jié)強(qiáng)度達(dá)到0．50MPa，浸水后的粘結(jié)強(qiáng)度大于0．30MPa。通過(guò)標(biāo)準(zhǔn)可以看出，耐水膩?zhàn)拥膹?qiáng)度高于普通內(nèi)墻膩?zhàn)?，因此使用耐水膩?zhàn)硬蝗菀桩a(chǎn)生空鼓、脫落。劣膩?zhàn)虞p輕一劃，就有很深的劃痕。

The standard of putty for indoor use of buildings has clear provisions on the strength of putty. The bonding strength of ordinary putty in the standard state is greater than 0.25MPa, and there is no requirement on the strength after immersion. The water-resistant putty requires the bonding strength in the standard state to reach 0.50mpa, and the bonding strength after immersion is greater than 0.30mpa. It can be seen from the standard that the strength of water-resistant putty is higher than that of ordinary internal wall putty, so it is not easy to produce hollowing and falling off when using water-resistant putty. The poor putty has a deep scratch when it is lightly scratched.

4．耐水性測(cè)試

4. Water resistance test

噴一點(diǎn)水，用手擦，耐水膩?zhàn)幽退坏舴?。劣膩?zhàn)佑鏊突?，滿手白粉。

Spray a little water and wipe it by hand. The water-resistant putty is water-resistant and does not drop powder. Poor putty melts when it meets water, and hands are full of white powder.