Which is better, Meichao 400 or 303 putty powder? Is 400 harder than 303? The oilman said it would be difficult to use?

Meichao's products are much better than 303 putty powder in strength, waterproof effect and crack prevention effect, and the price is much more expensive than 303, so 303 is generally used, which is cheaper.

Putty is generally composed of base material, filler, water and additives.

Binder, also known as binder, is the most critical component in putty, which mainly plays a variety of roles such as bonding. The most commonly used binders for putty are cement and organic polymers, which can be divided into emulsion and latex powder. Cement is a kind of binder with good adhesion, good durability and reasonable cost performance, but its tensile strength and crack resistance are poor. Organic polymer can modify and toughen it, thus improving the performance of putty.

Fillers mainly play a filling role, such as calcium carbonate, talcum powder, quartz sand, etc. Pay attention to the matching of filler fineness.

Additives include thickener, water-retaining agent, etc. Thickeners and water-retaining agents can retain water and improve storage and construction performance, and cellulose is generally used. Antifreeze is mainly used to improve the storage stability of putty at low temperature. Slipping agent and water reducer are generally used in advanced putty to improve the construction performance of putty.

Some also add fiber to prevent cracking.