Uses To waterproof concrete such as structural and precast concrete, renderings, screeds and granolithic toppings. Ideal to be used for basements, swimming pools, concrete roof, ground tank, reservoir, etc. Advantages Watertight – minimize water penetration into concrete. Increase compressive strength. The water reducing properties of Conplast WP421 enables higher compressive strengths to be obtained in concrete at the same workability. Increase plasticity – easier workability Easy to use Integral - not a membrane or surface film and its properties maintained when the surface damages. Chloride free Description Conplast WP421 is a brown liquid material instantly dispersible in water that is added to concrete to inhibit the passage of water, contains a non-air entraining plasticizer to assist optimum compaction, and selected antifoam agent to reduce the water penetration. Technical support Fosroc provides a technical advisory service for on-site assistance and advice on admixture selection, evaluation trials and dispensing equipment. Technical data and guidance can be provided for admixtures and other products for use with fresh and hardened concrete. Properties Chloride content : Nil to BS 5075 Specific gravity : 1.16 at 250 c Compressive strength : Independent test below was carried out to measure compressive strength, and water penetration after 28 days. The test was carried out using normal/control mix design and with Conplast WP421. Recommended Mix Proportion Cement minimum 350 kg/m3 Water cement ratio maximum 0.45 Initial Slump 80 ± 20mm Conplast WP421 dosage 1.5-2 ltr/m3 Final Slump 140 - 200 mm