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Sand Microtadelakt arches in the grand atrium of the Calligraphy Museum, Madinah
Lime plaster — technical data

Cemher Microtadelakt

One-component lime plaster

Manufacturer Cemher
Country of origin Spain
System family Lime plaster
Supplied and applied by Earth Layers

The product

A one-component hydraulic lime plaster with marble dust, trowelled at 1 to 4 mm over a prepared base. Worked wet-on-wet or wet-on-dry it produces tadelakt, marmarino or polished plaster effects from a single material, with a full EN standards record behind it.

Where it is used

Highly decorative continuous coatings for interior and exterior walls and ceilings Furniture, shelves, kitchen countertops and counters Over underfloor heating and fireplaces Over old ceramic tile coverings Kitchens, bathrooms and terraces Stores, offices, lobbies, exhibition areas and homes

Substrates

Concrete and cementitious mortars Ceramic MDF Plaster and plasterboard Clean, free of grease, consolidated and true in planimetry

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 One-component lime-based plaster, white powder
Applied thickness 1 – 4 mm
Water ratio Fine 10 kg : 4 L · Regular 10 kg : 4 L · Medium 20 kg : 6.5 L · Base 20 kg : 5 L
Consumption Fine 2 m²/kg · Regular 1.7 m²/kg · Medium 1.7 m²/kg · Base 1 m²/kg
Build-up Two coats of Base, then finish coats in Regular, Medium or Base
Between coats 4 hours, then a light sanding at 40 or 80 grit
Workability at 20 °C Approx. 120 minutes; pot life 3 hours
Minimum application temperature + 10 °C
Sealing Hidroprimer with Aquamax, or Maxipur, 24 – 48 hours after hardening at below 5% moisture
Shelf life 24 months, stored 10 – 30 °C, dry and ventilated
Packaging Fine 10 kg · Regular 10 kg · Medium 20 kg · Base 20 kg

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.

PropertyResultStandard
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 > 4 N/mm², Class B 4.0 UNI EN 13892-8:2003 / UNE EN 13813:2014
Impact resistance > 18.5 Nm, IR 18 UNI EN 6272-2:2012
Surface hardness > 200 N/mm², SH 200 UNI EN 13892-6:2003
Compressive strength > 40 N/mm², Class C40 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 in hardness UNI EN 13529:2005 / UNE EN 1504:2005
pH after 1 day 12 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.

Do not apply below 10 °C Suitable over hot water underfloor heating; not over electric underfloor heating pH 12 after one day — gloves and eye protection required Performance figures marked 1* are measured without sealer Must be sealed 24 to 48 hours after hardening, below 5% moisture
Specification clause

Lime plaster: Cemher Microtadelakt one-component lime plaster in colour [ref], two coats of Microtadelakt Base followed by finish coats in [Regular / Medium / Fine], total applied thickness 1–4 mm, over Primer 100 on the prepared substrate, finished [tadelakt / marmarino / polished plaster] to the approved sample panel. Reaction to fire Class A1 to UNE EN 13501-1:2019. Sealed with [Aquamax / Maxipur] 24–48 hours after hardening at below 5% moisture.

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

Cemher Microtadelakt Thick Base Lime-based plaster for high build Microtadelakt — four grain sizes Lime-based plaster, four grain sizes

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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