LetFix Universal

LetFix Universal

Flexible tile adhesive - Light

  • For ceramic and quarry tiles, mosaics and natural stone
  • For large-sized tiles and porcellanato tiles
  • Fixing of insulating plates
  • For interior and exterior use
  • Extra high yield
  • Extra smooth with light-weight workability
  • High initial grab
  • Approved for wet rooms
  • Suitable for underfloor heating
  • Bed thicknesses up to 5 mm

Product calculator

Product facts

Product

White, cement-based powder containing light fillers and high-performance polymer modifiers.

Colours

Coverage

Coverage

Notched trowel
Coverage per m²
4 x 4 mm
approx. 1,0
6 x 6 mm
approx. 1,5
8 x 8 mm
approx. 1,9
10 x 10 mm
approx. 2,4

Packaging

Available in 3.5 kg and 18 kg PE lined paper bags.

Features

Generel

Expected Result

Application

Waterproofing

Surface preparation

Fixing dowels

Finishing

Sealings

Flooring

Precautions

Alfix A/S H.C. Oersteds Vej 11-13 DK-6000 Kolding alfix.com
11
Declaration of performance
No. 1
EN 12004:2007+A1:2012
Alfix LetFix Universal
Improved cementitious
adhesive for internal
and external tiling
Reaction to fire NPD Release of dangerous
substances
See material safety data
sheet www.alfix.com
Bond strength: Initial
tensile adhesion
strength
≥ 1,0 N/mm² Durability, tensile adhesion
strength after heat
ageing
≥ 1,0 N/mm²
Durability, tensile adhesion
strength after water
immersion
≥ 1,0 N/mm² Durability, tensile
adhesion strength after
freeze/thaw cycles
≥ 1,0 N/mm²

Tile fixing

Tile fixing

Tests

DS/EN 12004 - DS/EN 12002

Surfaces

Technical data

Working temperature

+5°C - +30°C

Density

1.35 kg/litre (mixed with water)

Open time

20 – 30 minutes

Working time

5 hours at +20°C

Foot traffic/grouting

24-48 hours at +20°C

Full strength

7 days at +20°C

Tensile adhesion strength concrete:

1.0 – 2.0 N/mm²

Classification - DS/EN 12004

C2 TE S1

Shelf life

Min. 12 months in unopened bag

How to use

Surfaces

Cement/sand rendering, brickwork, aerated concrete.
Screed, with or without underfloor heating, older than 14 days.
Light-weight concrete, max. moisture content 8%.
Flooring containing cement-based levelling compound.
Anhydrite floors, max. residual moisture 0.5%.
Concrete in situ and precast units/slabs, older than 6 months.
Paper-faced plaster boards, fibre-reinforced plaster boards.
Existing tiles, terrazzo.
Vinyl and paint on concrete.
Alfix Sealing Membrane.

Plaster, wood, existing tiles, vinyl, and paint are not considered suitable surfaces for exterior use or in areas exposed to frequent or permanent water.

Surface preparation

The surface should be dimensionally stable, sound, and clean. Free from laitance, grease, and dust. There should be no blooms or crack formations. Residues from grease or soap can be removed with Alfix Deep Cleaner. Ensure that paint is sufficiently adhering and non-flaking. Sand/Matt vinyl and paint with the appropriate sandpaper and apply a thin contact layer of Alfix LetFix Universal.
Straightening of lumps and unevenness of up to 5 mm can be carried out using Alfix LetFix Universal.
On absorbent, moisture sensitive interior surfaces, such as aerated concrete, gypsum plaster, plaster boards, and anhydrite floors, apply Alfix Primer (Sealing Primer) or Alfix PlaneMixPrimer
For exterior use, apply a thin contact layer of Alfix LetFix Universal.

How to use

Add approx. 0.4 – 0.5 litres of clean, cold water per kg powder depending on whether to use as non-slip wall adhesive or pourable floor adhesive.

Apply Alfix Letfix Universal to the surface with a notched trowel, using the straight edge to spread out adhesive and subsequently the notched edge to produce a ribbed bed.

Fix tiles within 20-30 minutes by pressing them firmly into position in the wet adhesive with a slight twisting action. When fixing mosaics, a firm tap is required.
Ensure complete adhesive coverage!

For tile sizes exceeding 60 X 60, apply adhesive to both tiles and surface to ensure solid bedding leaving no voids (buttering/floating method).

For exterior use, e.g. stairs and facades, regardless of tile size, always apply buttering/floating method.

NB!

Large-sized tiles and natural stone may call for extra attention.
Alfix LetFix Universal is based on white Portland cement, which prevents colour difference at bright natural
stone. However, this can not be guaranteed under all conditions. Hence, for receptive and moisture
sensitive stones it is recommendable to trial a small area to ensure that tile and adhesive are compatible.
Additional water should not be added to adhesive already starting to set. Note that the temperature of
mixing water will influence setting time.
Repositioning of tiles should be done within approx. 20 minutes after fixing, depending on substrate and
tile absorbency.
Switch off any underfloor heating.

 

Cleaning

Clean adhesive residues from tools and tiles with water before the adhesive sets. Cement-based products harden when mixed with water, hence do not pour surplus adhesive into the drain system.

September 2017

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