Composition and technical characteristics of CMC glue, instructions for use
CMC is the most popular glue used to glue any type of wallpaper. Due to its high-quality composition, this product protects against mold, insects, is not afraid of high humidity, low or high temperatures. CMC comes in the form of a powder, which is diluted with water before use. The finished mixture is non-toxic, odorless and does not stain the canvas. Glue solution is able to glue wallpaper to any surface, and CMC is cheaper than other compositions.
General description and purpose
CMC glue is produced in chemical plants based on cellulose. If you decipher the abbreviation CMC itself, you get the word - carboxymethylcellulose. In addition to the cellulose transformation product, the glue contains anti-caking agents and antifungal agents. All components, although of synthetic origin, do not harm health.
CMC is designed to glue different types of wallpaper to any surface (concrete, plaster, wood). Several types of glue are produced.They differ in the percentage of sodium carboxymethylcellulose (the higher this indicator, the higher the adhesion ability of the glue).
CMC is mixed with cement mixes and gypsum fillers to increase their strength. This product is used in various industrial sectors. The glue looks like a free flowing powdery white powder. If the CMC has a yellow color, it means that the product is long expired.
It is better not to use such glue, otherwise yellowish spots and streaks will appear on the wallpaper.
CMC is the most requested repair product, and all thanks to its ease of use and low cost. Before use, the glue is diluted with water in the dosage indicated in the instructions. It is then left to swell (depending on the type of CMC) for 15 minutes or 2-3 hours. The finished mixture looks like a colorless, gelatinous, viscous mass. The solution never forms clots or lumps, has no smell, does not leave yellowish streaks on the wallpaper. The pot life of a 4% mixture can be up to seven days.
Varieties, composition and technical characteristics of glues for wallpaper
Chemical companies produce their own type of CMC for different types of wallpaper. The characteristics of each are indicated on the label or packaging. In any composition of the basic substance there must be at least 50 percent, and the proportion of sodium chloride must be 21 percent. The moisture content of the mixture can reach 12 percent. The solubility of the powder is 96 percent.
CMCs differ in composition and percentage of carboxymethylcellulose.Almost all manufacturers produce universal glue that can be used for gluing all types of wallpaper. For each finishing material, its own solution is prepared, in which water is taken in more or less quantity.
For light and thin wallpaper
For the thinnest paper wallpapers it is recommended to use KMT Burny, KMTs-N, KMTs-1 (Shaving). In shape, the glue is a powdery substance of white or pink color, without any smell. Before use, the powder is diluted in water according to the instructions for use. The adhesive solution applied to the surface dries for a long time. During the repair period, they make sure that there are no drafts in the room.
Average weight
Non-woven wallpaper is considered slightly heavier than paper. For their bonding, KMTs-N or KMTs-N Super-Max, Mini-Max, Extra Fast are used. This product is a fine grainy powder. The packaging should indicate the type of wallpaper for which the glue is used. Any glue is diluted with water according to the instructions.
Thick and heavy wallpaper
inil wallpaper is considered the heaviest. To glue the surface with thick wallpaper, KMTs Super Strong is used. To glue the surface with thick wallpaper, KMTs Super Strong is used. leaving the adhesive, sometimes PVA glue is added. Outwardly, thick wallpaper glue looks like a white paste. Before use, the product is diluted with water at the dosage indicated in the instructions.
How to apply correctly
How to prepare the adhesive solution, write the instructions on the label or package. Usually the slurry is prepared in a plastic bucket. Take water at room temperature (not hot). First, the liquid is poured into the bucket. Then a measured amount of powder is poured in a thin stream, with constant stirring.Mix the glue well and leave to swell for 15-20 minutes or 2-3 hours.
The time required for the infusion is indicated in the instructions.
Usually, a standard package of CMC weighing 500 grams is diluted in 7-8 liters of water. This solution should be enough to glue an area equal to 50 square meters. Before gluing the wallpaper, the walls are primed with an adhesive solution based on CMC. For this, take 500 grams of glue per ten liters of water. The liquid mixture is applied to the walls and left to dry for 3-4 hours. The wallpaper itself is greased with an adhesive mass and left to soak, depending on the thickness of the strip, for 10-20 minutes. Before gluing the walls, the wallpaper is again coated with an adhesive mixture.
Alternative uses
KMT glue is not only used for wallpapering walls. Due to its high adhesive characteristics, this product is used in various sectors of the national economy.
Foundry
The sodium salt of carboxymethylcellulose is used in the foundry industry as a core fastener.
Building
CMC is added to tile mortar, gypsum or cement mastic. This glue is mixed with the mortar used for laying foam blocks or aerated concrete.
Manufacture of finishing and construction materials
Glue is mixed with clay or cement, a mixture of gypsum in the manufacture of finishing building materials. CMC increases the strength of the finished product and improves its performance.
Chemical industry
In the paint and varnish industry, CMC is used as a thickener. Carboxymethylcellulose is the basis for the manufacture of facades and various water-based paints. This substance is used in the production of various synthetic detergents.
Mining industry
Sodium carboxymethylcellulose is used for the flotation beneficiation of copper-nickel ores and sylvinites.
oil and gas
Carboxymethylcellulose is used as a stabilizer for highly mineralized clay suspensions. This substance is used as a regulator of the properties of drilling fluids when drilling oil and gas wells.
Advantages and disadvantages
The CMC has many advantages. This glue is part of the long livers. It has been in the construction and repair market for several decades. Always very cheap. This economical product has a very low consumption. Usually one bundle is enough to wallpaper an average sized room. Glue is used for sticking thin paper and thick vinyl wallpapers.
CMC is diluted only with water at room temperature. You do not need to add other substances to prepare the solution. The adhesive mixture is easy and quick to prepare. It does not contain any toxic additives. The mass is homogeneous, colorless, without lumps and sediment. The adhesive mixture can be used in any room, even in a child's room. When dry, the solution does not emit any toxic substances for the body.
The adhesive mixture itself, prepared from white powder and water, is colorless. It has no smell. Some manufacturers tint the dusty pink to show where the glue is applied to the canvas or wall. The adhesive solution ensures that the wallpaper adheres to all types of surfaces. The main thing is to clean the wall of crumbling particles before repairing. The CMC can be used even in rooms with high humidity.
Insecticidal and antifungal additives are added to the glue.For example, boric acid salt, aluminum-potassium sulfate, carbolic acid. Such substances improve the quality of the adhesive mixture, prevent fungus, mold and insects from breeding under the wallpaper.
The CMC has drawbacks. This glue takes time to swell. Usually around 2-3 hours. Modern formulations have a shorter swelling period of only 15-20 minutes. True, the price of such products will be higher. After gluing the walls, you need to wait at least 3 days for the glue to dry completely.While the substance dries, there should be no drafts in the room. The repair itself is better in the summer, so that the wallpaper dries naturally, without turning on electrical appliances.