VINNAPAS® 825 ED
VINNAPAS® 825 ED is an all-round construction dispersion for two-component dry mix mortars, specifically suited for cement admixtures and two-component cementitious self-leveling compounds. It is based on a semi-flexible terpolymer of vinyl acetate, ethylene and vinyl chloride and belongs to the product class VINNAPAS® ED which means that it enhances the adhesion and mechanical strength of mortars.
- VINNAPAS® 825 ED is an aqueous dispersion of a vinyl acetate, ethylene, vinyl chloride terpolymer with a 50 % solids content.
- VINNAPAS® 825 ED is ideal for modifying inorganic binders, such as cement, lime and gypsum in conjunction with granular aggregates.
- VINNAPAS® 825 ED can be blended with most VINNAPAS® dispersions and many other aqueous polymer dispersions in any ratio. When blending, it is important to adjust the pH of both dispersions which are to be blended in a pH range in which both dispersions are stable. Storage tests should be carried out to check the compatibility of the mixture.
The most important applications of VINNAPAS® 825 ED include the production of floor screeds, repair mortars and cement-bound construction adhesives. VINNAPAS® 825 ED increases mechanical strength and significantly improves adhesion to the substrate. VINNAPAS® 825 ED modified coatings and screeds are tough and resilient. This dispersion also produces good results in relatively thin screeds. For example, it improves abrasion resistance and reduces the risk of cracking. VINNAPAS® 825 ED contains the ideal amount of antifoam agent for the recommended applications. Addition of VINNAPAS® 825 ED increases the density of the product, reducing penetration by water, petrol and oil.
For typical application fields of VINNAPAS® 825 ED, refer to the section "application". Please discuss additional applications with your WACKER customer representative.
VINNAPAS® 825 ED can be freely diluted with water, but if diluted below a solids content of 20%, the resin has a slight tendency to settle out when stored for lengthy periods. However, the resin can be homogeneously redispersed simply by stirring or shaking. Suitable thickening agents include cellulose derivatives and inorganic thickening agents. The influence of these additives on the properties of the end products (mortar, screed, adhesives) must always be tested. Salts of polyacrylic acid can greatly delay the setting time of the cement.
It is not usually necessary to add solvents or plasticizers, since VINNAPAS® 825 ED has a minimum film-forming temperature of approx. 7°C.
If the product is used in applications other than those mentioned, the choice, processing and use of it is the sole responsibility of the purchaser. All legal and other regulations must be complied with.
Slight color variations of the dispersible polymer powder may occure without impairing the product's functionality.
When the dispersion is stored in tanks, proper storage conditions must be maintained. VINNAPAS® 825 ED has a shelf life of 6 months starting from the date of receipt if stored under cool (below 25 °C) but frost-free conditions in the original, unopened containers. Iron or galvanized iron containers and equipment are not recommended, because the dispersion is slightly acidic. Corrosion could result in discoloration of the dispersion or blends made from it in further processing. We therefore recommend the use of containers and equipment made of ceramic, rubberized or enameled materials, appropriately finished stainless steel, or plastic (rigid PVC, polyethylene or polyester resin). As polymer dispersions may tend to superficial film formation, skins or lumps may form during storage or transportation. Filtration is therefore recommended prior to utilization of the product.
Preservation for Transport, Storage and further Processing
VINNAPAS® 825 ED is adequately preserved during transportation and storage if kept in the original, unopened containers. When stored in tanks, the dispersion should be modified with a preservative to prevent microbial contamination. Suitable measures should be taken to ensure that the tanks are properly clean. In storage tanks in which the product is not stirred, it is advisable to cover the surface of the dispersion with 1 - 2 cm of water, to which a preservative has been added. This will prevent skin formation and microbial contamination. In the case of storage in silos, it is important that the air drawn into the silo when the product is discharged is also kept free of germs. As a rule, all finished products manufactured from polymer dispersions also require preservation. The type and extent of preservation will depend on the raw materials used and the anticipated sources of contamination. The compatibility and effectiveness of the preservatives should be checked for a given formulation. Preservative manufacturers will be able to advise you on the type and amount of conservation agent to use.