To easily inject by crack width, it is divided in to the ultra-low viscosity product, the low viscosity product,the mid-viscosity product and the high viscosity product. To control the curing speed, it is divided in to the summer product,the spring and fall product and the winter product. Its curing speed can be controlled by the user's requirement. When fully hardened after injected,it does not chemically affect the concrete structure and it prevents corrosion on it so highly durable.