HYDROCEM DWT is a two-component, acrylic-modified cementitious waterproofing mortar formulated specifically for potable water tanks and critical waterproofing applications. It combines high-quality binders, Portland cement, silica sand, special hydrophobic agents, and a liquid copolymer acrylic component. HYDROCEM DWT is designed for internal waterproofing of drinking water tanks, basements, and below-grade structures. It is non-toxic, safe for potable water, and forms a highly durable, flexible membrane with excellent crack-bridging properties up to 2.0 mm. Breathable and highly resistant to chemicals, chlorides, and carbon dioxide, it provides superior adhesion to concrete and masonry, ensuring lasting protection against positive and negative water pressures.
Hydrocem DWT is a pre-measured two-component kit mixed on site and applied in two coats by trowel, brush or spraying machine.
Summary of the method in the Hydrocem Dwt Technical Data Sheet. Always follow the full TDS on site.
| Standard | Title | Referenced for |
|---|---|---|
| ASTM D412 | Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers—Tension | Elongation 100% (unbonded); tensile strength >2.5 N/mm² |
| EN 12390-8 | Testing hardened concrete — Depth of penetration of water under pressure | Water impermeability: positive >5 bar, negative 3 bar |
| ASTM E96 | Standard Test Methods for Water Vapor Transmission of Materials | Moisture vapor transmission <25 g/m²/day |
| ASTM D2240 | Standard Test Method for Rubber Property—Durometer Hardness | Shore A hardness 30 |
| BS 6920 | Suitability of non-metallic materials and products for use in contact with water intended for human consumption with regard to their effect on the quality of the water | Toxicity: NIL |
| ASTM D4060 | Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser | Listed in the TDS |
| EN 14891 | Liquid applied water impermeable products for use beneath ceramic tiling bonded with adhesives — Requirements, test methods, assessment and verification of constancy of performance, classification and marking | Listed in the TDS |
| ASTM C836 | Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Separate Wearing Course | Listed in the TDS |
| DIN 1048 | Testing methods for concrete (Prüfverfahren für Beton) | Listed in the TDS |
Standards and test methods as referenced in the Hydrocem Dwt Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.
Yes. The TDS states it is non-toxic when cured and suitable for drinking water storage tanks, with a BS 6920 toxicity result of NIL. Wash the cured coat thoroughly with plenty of water while scrubbing with a sponge before using the tank.
About 8.5-9.0 square meters per 30 kg kit at 2.00 mm thickness. Two coats of 1.60 kg/m² each (3.20 kg/m² total) give a 2.00 mm membrane.
Yes. Per EN 12390 part 8, water impermeability is above 5 bar positive and 3 bar negative.
Pot life after mixing is 45 minutes at 25°C. Apply between +5°C and +35°C; drying time is 8 hours and the recoating interval is 4-8 hours.
The TDS gives a curing time of 48 hours before tile application.
