1. From the putty hardness, whiteness, fineness, workability, construction performance, environmental protection and other aspects, it is difficult to distinguish the good from the bad with naked eyes. Generally, a good putty with high viscosity and fine is a good putty. On the contrary, the putty with divergent and pinholes is poor in quality. If you shovel some good putty with a gray knife, it will fall off quickly, indicating that the putty has low viscosity. After the construction, if the putty is dry, it can't be touched by hands, scratched by nails and brushed by water, it's a good putty

2、看包裝：在選購膩?zhàn)臃鄣臅r(shí)候，首先需要注意的是膩?zhàn)臃鄣纳a(chǎn)標(biāo)準(zhǔn)、合格證以及質(zhì)量方面的證書以及印章是否存在，盡量選擇及哦啊為環(huán)保的膩?zhàn)印?/div>