Smoothed concrete, smoothed cement, or polished cement is different from what is known as micro cement:
- Smoothed concrete has a thickness between 5 and 10 centimeters, which offers it high resistance to wear and scratches, which is why it is used in those floors installed in public spaces and with a high conglomeration of people. It is a material that requires expansion joints due to its high thickness and is also prone to cracks.
- In contrast, micro cement is a continuous coating, whose final thickness is between 2 and 4 millimeters. It is a material that does not crack and does not require contraction joints. In addition, thanks to its low weight and flexibility, it is highly recommended for renovations that do not require clearing.
Microcement is a continuous coating, it does not crack and is characterized by its low weight and flexibility
Why should microcement and concrete floors be sanded?
Sanding operations on micro cement floors, as well as on concrete, are essential to correct possible irregularities between the different applied layers of these materials. It is also important when removing burrs from the trowel and creating secure anchor points, precisely to increase adhesion between coats and provide a smooth and shiny appearance, as well as a smooth texture to the final surface.
Why use a hand sander
Hand sanders are a very useful instrument if we want to achieve efficient sanding of the micro cement and make the process easy and comfortable.
A portable hand sander saves us time and effort, while also being a highly productive tool.
This type of machine allows the floor sanding of areas of difficult access, reaching joints and small corners. They also offer us freedom of movement by being able to alternate floor sanding on horizontal and vertical surfaces.
How to sand microcement: steps and keys to sanding
When floor sanding micro cement, it is necessary to take into account certain steps to follow and some important keys about sanding.
- First, the floor sanding between layers of the previously applied base material is carried out. The times we sand the base material will be determined based on the number of passes we give it. In this first stage, we will carry out a rough sanding of the surface. For this, we will use abrasive discs with a grain size of 24, 40, and/or 80, with grain 40 being the most common in this operation.
- This is followed by sanding between layers of the fine material, previously applied to the initial base material. As on other occasions, the number of sanding will be decided based on the number of layers that have been given prior to finishing. To carry out this final sanding we will use abrasive discs of grit 120, 220, and 400, with grit 120 being the most used.
Tips for the correct floor sanding of micro cement
Some of the tips to take into account when making and obtaining a correct sanding of the microcement are:
- Layer drying. Before sanding the micro cement or flooring, the layer that we have applied must be completely dry. Therefore, it is necessary to take into account that the drying time between layers of the base material is between five and eight hours. Likewise, if we talk about the drying time between layers whose material is fine, the time is shorter and ranges between three and five hours.
- Cleaning. At the end of the sanding process, it is necessary to carry out a correct and effective cleaning of the dust generated before starting the application of the next layer or, if necessary, before applying the final sealer (polyurethane resin).
- Use basic safety elements for sanding for the operator who has to carry it out: dust mask, eye protection glasses, gloves to minimize the vibrations of the operation, as well as the friction that could be generated as a result of the process.
Tools used: why sand micro cement floors with silicon carbide abrasives
Knowing how to choose the right abrasive products to sand micro cement floors is essential. Floor sanding and polishing operations must be carried out with abrasive discs whose mineral is silicon carbide. It is the synthetic mineral with the highest hardness except for diamonds (between 9 and 9.5 on the Mohs scale. This characteristic classifies it as the optimal mineral for sanding both concrete and micro cement surfaces, which present a high surface hardness.
Floor sanding is one of the most specialized manufacturers in the stamping of abrasive discs and sheets, oriented to different and varied industries and sectors.
At floor sanding has all the disc formats that the market offers, suitable for all portable sanders you can find. In addition, we are a fast and efficient supplier with excellent adaptability to serve all levels of consumption.
Do you want to know more about the abrasives you need for sanding micro cement floors? Contact us and we will advise you.