VINNAPAS® 825 ED

• Cement Admixtures
• Primer

• 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.

Processing

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.

• 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.

Non-returnable PE drums of 150 kg capacity (standard dispatch quantity: only fully-loaded pallets - 750 kg), and nonreturnable containers of 1 t capacity.

• When the dispersion is stored in tanks, proper storage conditions must be maintained. The product has a shelf life of 6 months starting from the date of manufacture if stored in the original, unopened containers at temperatures between 5 and 30°C. 
• Iron or galvanized-iron equipment and containers are not recommended because the dispersion is slightly acidic. Corrosion may result in discoloration of the dispersion or its blends when further processed. Therefore, the use of containers and equipment made of ceramics, rubberized or enameled materials, appropriately finished stainless steel, or plastic (e.g. rigid PVC, polyethylene or polyester resin) is recommended.
• 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

• The product is adequately preserved during transportation and storage if kept in the original, unopened containers. However, if it is transferred to storage tanks, the dispersion should be protected against microbial attack by adding a suitable preservative package. Measures should also be taken to ensure cleanliness of the tanks and pipes. In unstirred tanks, a layer of preservative-containing water should be sprayed onto the surface of the dispersion to prevent the formation of unwanted skin and possible attack by microorganisms.
• The thickness of this water layer should be < 5 mm for low viscosity dispersions and up to 10-20 mm for high viscosity products. Proper procedures - periodic tank cleaning and sanitization - must be set up in order to prevent microbial attack. Contact your biocide representative/supplier for further plant hygiene recommendations.
• Measures should be taken to ensure that only clean air enters the tank when the dispersion is removed. Finished products manufactured from polymer dispersions usually also require preservation.
• The type and scope of preservation will depend on the raw materials used and the anticipated sources of contamination. The compatibility with other components and the efficacy of the preservative should always be tested in the respective formulation. Preservative manufacturers will be able to advise you about the type and dosage of preservative required.