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Seamless Microdur Plus microcement to the villa pool terrace at Katara Hills, Doha
Microcement — technical data

Cemher Microdur Plus

Three-component microcement

Manufacturer Cemher
Country of origin Spain
System family Microcement
Supplied and applied by Conmarble Natural Finishes

The product

A three-component microcement, waterproof in mass, for continuous floors, walls and ceilings inside and out. Its hardness and chemical resistance are what make it a specification for high-traffic and humid areas — it is a durable, low-VOC cementitious coating, not a natural finish.

Where it is used

  • Highly decorative continuous floor coverings, walls and ceilings, interior and exterior
  • Coating of underfloor heating, fireplaces, furniture, shelves, kitchen worktops and counters
  • Coating of old ceramic tile and other tile coverings
  • Interior and exterior rooms, kitchens, bathrooms and terraces
  • Indoor and outdoor pavements on cementitious substrates
  • Shops, offices, lobbies and exhibition areas

Substrates

  • Concrete and cementitious substrates, consolidated and in good condition
  • Old ceramic tile
  • Clean and free of grease
  • Compactec mortar consolidator, vapour barriers or Vapoepox rising damp barriers where the substrate requires them
  • No bonding bridge — apply directly

Application data

Coverage, thickness, mix and cure, as declared by the manufacturer. Site conditions in the Gulf sit at the top of most of these ranges — allow for it in the programme.

Type Three-component microcement — white powder with two resins
Applied thickness 0.3 – 5.5 mm
Mix ratio 10 kg Microdur Regular + Comp A 3.6 kg + Comp B 450 g · 20 kg Microdur Base + Comp A 4.8 kg + Comp B 600 g
Consumption Microdur Regular 1.7 m²/kg · Microdur Base 1 m²/kg
Build-up First Base coat, fibreglass mesh embedded in the fresh coat, second coat after drying, sanded at 40 grit
Workability at 20 °C Approx. 120 minutes
Underfloor heating Hot water: yes. Electric: yes.
Furniture with casters Yes
Sealing No pore sealer needed before the sealant, thanks to the in-mass waterproofing
pH after 1 day 12

Performance data

Every figure below is reproduced from the manufacturer's own technical data sheet, with the test standard it was measured against. The sheet itself is in the download section.

Property Result Standard
Emissions into indoor air A+ UNI EN ISO 16000-6:2019 / UNE EN 16516:2018
Thermal conductivity 0.46 W/mK UNI EN 12664:2002
Reaction to fire Class A1 / A1FL UNE EN 13501-1:2019
Adhesion strength > 6 N/mm², Class B 6.0 UNI EN 13892-8:2003 / UNE EN 13813:2014
Impact resistance > 25.5 Nm, IR 24 UNI EN 6272-2:2012
Surface hardness > 200 N/mm², SH 200 UNI EN 13892-6:2003
Compressive strength > 50 N/mm², Class C50 UNI EN 13892-2:2005
Abrasion resistance (BCA) Class AR 0.5, max 50 µm UNI EN 13892-4:2003
Water penetration under pressure 5 bar, 3 days — no penetration under direct pressure, no humidity under indirect UNE EN 14891:2017 / UNI EN 12390-8:2020
Slip resistance USRV 41, Class 2 UNE EN 12633:2003
Permeability to liquid water < 0.1 kg/(m²·h^0.5), Class II UNE EN ISO 1062-3:2008
Water vapour transmission Class 1, Sd < 5 m UNE EN ISO 7783-2:2012
Resistance to severe chemical attack No alteration and no reduction of hardness UNI EN 13529:2005 / UNE EN 1504:2005
Chemical resistance High resistance to ammonia, water, oil, soft drinks and coffee; sensitive to vinegar and organic acids Cemher data sheet

Where not to use it

The limits are as much a part of the specification as the performance. Everything here is stated on the manufacturer's data sheet.

  • Not suitable for swimming pools or continuously immersed surfaces
  • Sensitive to vinegar and other organic acids
  • Do not apply below 10 °C or above 30 °C
  • Contains cement; avoid contact with eyes and skin and avoid inhaling dust
  • Performance figures marked 1* are measured without sealer
Specification clause

Microcement: Cemher Microdur Plus three-component microcement in colour [ref], applied 0.3–5.5 mm in two base coats with alkali-resistant fibreglass mesh embedded in the first, and two finish coats, over a substrate of not less than 25 N/mm² compressive strength. Reaction to fire Class A1 to UNE EN 13501-1:2019, compressive strength Class C50 to UNI EN 13892-2:2005. Sealed with Hidroprimer and [Aquamax / Maxipur] 24–48 hours after hardening at below 5% moisture. Not for use in swimming pools or continuously immersed surfaces.

Square brackets mark the choices that belong to the project. Send us the finishes schedule and we will return the clause completed, with the sample and mock-up programme against it.

Documents

Every document is the manufacturer's own, reproduced in full and unaltered under our cover. Free to download, no form.

The rest of the microcement range

Cemher Microrock Two-component polymeric microcement Microrock Base Two-component microcement base Micropool Two-component microcement for immersed surfaces

Technical support for the design team

We supply the material and we apply it, so the specification and the workmanship sit with one party. Send a finishes schedule, an elevation or a mood board and we will come back with the system, the build-up, the sample programme and a completed clause.

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