Putty is generally composed of base material, filler, water and additives.
According to China's national standards, finished putty can be divided into general putty (Y type) and water-resistant putty (N type).
General putty (Y-type): It consists of Shuangfei powder (namely calcium carbonate), starch glue and cellulose.
Water-resistant putty (N type): It consists of calcium carbonate, calcium lime powder, cement, organic rubber powder, water-retaining agent, etc.
Formula:
Water-resistant putty: One ton of calcium carbonate, ten kilograms of sodium carboxymethyl cellulose (CMC) and eight kilograms of pregelatinized starch can be put into a blender and stirred for 10- 15 minutes. This formula is rarely used now.
Water-resistant putty for interior wall: 70%~80% of heavy calcium (or talcum powder), 20%~30% of gray calcium (lime powder) and proper amount of cellulose.
Exterior wall waterproof putty: stone powder+quicklime+cement+cellulose+rubber powder (EVA, PVA)