Koster BDM is a high-performance liquid additive for reinforced concrete, designed to reduce water absorption, increase compressive strength and improve chemical resistance. Made from a polymer liquid, it crystallises within concrete, blocks capillaries and makes the mix water repellent. Suitable for all Grades under BS 8102:2022 and free from corrosive ingredients.

  • Liquid additive for concrete to enhance waterproofing and durability

  • Crystallises and blocks pores to reduce water absorption

  • Raises chemical resistance and extends structure lifespan

  • Non-corrosive and not affected by surface damage

  • Suitable for both positive and negative side resistance

  • Compatible with all structural concrete mixes

Applications

  • Structural concrete including ready-mix and pre-cast

  • Below-ground structures such as basements, lift pits, slabs, liner walls and capping beams

  • Podium decks and green roofs

  • Water-retaining structures like swimming pools, ponds and reservoirs

  • Volatile ground conditions including waste transfer stations

  • Tunnel and bridge design

Weight

DMS 576: 30kg

DMS 568: 100kg

Performance

Density: approx 1.1g/cm³

Viscosity: approx 100–200mPa·s

Working temperature: +5°C

Materials

Polymer liquid

Colours

Clear

Finish

Milky appearance

Installation

Store frost-free at +5°C to +25°C

Accreditations

Complies with BS 8102:2022 for Type B waterproofing

NBS Specification E10/20 Designated concrete

NBS Specification E10/418 Proprietary admixture

Warranty

10-year warranty