Altro Mosaic

Altro Mosaic™ standard matt, Altro Mosaic™ standard gloss, Altro Mosaic™ vertical matt and Altro Mosaic™ vertical gloss

Multi-colour decorative floor finish system, Nominal thickness 1-1.5mm
Technical and installation data sheet

September 2016

Product description
FeRFA type 4

Altro Mosaic is a solvent-free epoxy resin combination system that encapsulates decorative acrylic flakes in Altro Tect standard clear epoxy resin. Select from two distinctly different systems, one offering a vibrant glossy finish the other a subtle glazed smooth appearance.

Altro Mosaic standard gloss - Uses a base of high build coloured epoxy, Altro Tect standard coloured with a full scatter of multicoloured paint flakes sealed with two coats of Altro Tect standard clear to leave a textured high gloss finish.

Altro Mosaic matt - Altro Tect standard coloured with a full scatter of multi coloured paint flakes sealed with three coats of Altro Tect standard clear and a final seal of Altro Seal water based matt, to leave a glazed matt finish.

Standard colours

Altro Mosaic variants are available in a range of 15 standard colours with options for bespoke colours.


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Typical areas of use

  • Medium duty areas
  • Communal areas
  • Walkways
  • Corridors
  • Reception areas
  • Atria


  • Low odour
  • Good chemical resistance
  • Good abrasion resistance (to general light traffic)
  • Optional finishes
  • Ease of cleaning

Chemical resistance

Altro Mosaic variants offer good resistance to a range of commonly used chemicals. However, premature or prolonged contact with chemicals (including water) during the curing process may give rise to discolouration, staining and variation in gloss. In all cases of chemical spillage, it is essential that the spillage be immediately removed and the surface washed down with clean water, removing water by wet vacuum after operation. Although some chemicals may cause discolouration, this may not affect the durability and integrity of the resin coating. Please refer to Altro and FeRFA Guidance Note No.3 for further information.

Typical physical properties

Speed of cure Light foot traffic 24 hours @ 20°C
Full cure 7 days @ 20°C
Application temperature   10°C to 25°C
Usable working life   30 minutes @ 20°C
Intercoat period   18 to 24 hours @ 20°C
Surface tensile strength Onto concrete > cohesive strength of the concrete


Altro Tect standard coloured is available in a 6.3kg two-part composite pack.

Flakes available in a 5kg bag.

Altro Tect standard clear is available in a 5.3kg two-part composite pack.


Altro Tect standard coloured 1st coat 20m²/6.3kg
Altro Mosaic 250g/m²
Altro Tect standard clear 1st seal coat 20m²/5.3kg
Altro Tect standard clear 2nd seal coat 20m²/5.3kg
Altro Tect standard clear 3rd seal coat 20m²/5.3kg
Altro Seal water based matt 100m²/5kg

Material usage is dependent upon temperature, surface profile and porosity; the stated coverage rates should be referred to for guidance only and cannot be relied upon to determine exact quantities. Priming of porous substrates will improve the coverage rates. Pale colours may require additional coats to cover a dark substrate.

Although stringent quality assurance processes are employed, when colour consistency is essential a single batch must always be used where possible.


Ensure that the product is received in good order and store in a dry, frost free environment, ideally between 15°C and 20°C for at least three days before laying. Excessively high and low storage temperatures will affect the laying performance of the product.

Suitable substrates

The Altro Mosaic variants can be applied to a variety of substrates including, but not limited to, concrete, polymermodified cementitious screeds and terrazzo. For all proprietary subfloor systems refer to the manufacturer for recommendations and seek further guidance from Altro. FeRFA, The Resin Federation, does not recommend Calcium Sulphate, Anhydrite or Hemi-hydrite screeds for overlayment with synthetic resin surfaces.

Substrate requirements

Substrates should be dry, structurally sound and free from contamination, friable materials or laitance which may affect either the adhesion or penetration of the resin system.

All residues of old paint coatings and dust must be removed. Substrates to achieve 26N/mm² compressive strength (BS EN 12504-2) and surface tensile strength 1.5N/mm² (BS EN 13892-8). Substrates must include an effective damp-proof membrane and contain residual moisture not greater than 5% by weight (75% RH) to BS 8203:2001 (see Altro Proof for installations above 75% R.H.).

Variable porosity and profile of the substrate will affect both coverage rates and final appearance.

Please consult Altro or FeRFA’s Guide to the Specification and Application of Synthetic Resin Flooring for further information.

Substrate preparation

Surface preparation is the most vital aspect of resin flooring application. Inadequate preparation will lead to loss of adhesion and failure. The substrate in question will dictate the method of preparation. In the case of a concrete floor, preparation by dust enclosed diamond floor grinder may be appropriate, or if of a sufficient area for economic reasons, should be lightly shot blasted to leave a textured surface free from contamination.

If the floor has been treated with a cementitious surface improver, then the surface should be prepared in accordance with the manufacturer’s recommendations, or abraded with an STR machine followed by thorough vacuuming.

Treatment of local repairs such as cracks and holes, improvement or modification of levels and removal of high spots, should be undertaken prior to the flooring installation. Thin coatings will reflect the surface texture. High spots may lead to local premature wear. Excessive profiles as a result of inappropriate surface preparation may significantly affect application, coverage and performance.

Please consult Altro or FeRFA’s Guide to the Specification and Application of Synthetic Resin Flooring for further information.


Before proceeding with the installation, careful consideration should determine the best way of installing the Altro system. Efforts should be made to minimise day joints and optimise the open time of the product (i.e. minimise the distance between mixing and laying). It is best to also consider the effect of external influences on the final installation. Time spent at this stage will be invaluable towards the success of your installation.

The Altro Mosaic system is designed to be laid at a nominal 1.0 – 1.5 mm thickness.


The following application guide is based on laboratory and simulated site conditions. However, when installations conditions differ appreciably from those detailed by Altro, the performance characteristics of both mixing and laying may not be as expected. To achieve the best results at all times please endeavour to establish the correct conditions which in turn will allow the materials to be laid effectively, and meet your customer’s expectations.

Installation conditions

Apply in well ventilated areas. Both the slab and air temperature should be between 10°C and 25°C. It is not advisable to mix and lay epoxy resin products outside this range. Ambient conditions should be maintained at least 3°C above dew point or below 75% R.H. during the initial stages of cure. At site temperatures below 10°C cure times will be substantially increased unless some form of external heating is used. (Avoid using heating sources that give rise to high levels of humidity). It must be recognised that the concrete slab temperature will generally be lower than the air temperature, often as much as 10°C, and this will govern the rate of cure. As the resin flooring cures, in condensing conditions moisture vapour may condense onto the surface and cause ‘blooming’, a permanent clouding of the surface. Cold, wet or humid conditions, and limited air-flow, can result in condensation on the part-cured floor. The workability, open-time, cure development and return to traffic will be significantly affected by ambient conditions.

Mixing equipment

  • Slow speed drill (200-500rpm), such as MM17 *
  • Mixing paddle, such as MR2 60B *

* All tool number references relate to Refina Ltd 01202 632 270

Product installation

Using a slow speed drill and paddle thoroughly mix the base colour for 30 seconds. Pour all of the hardener into the pre-mixed base and mix for a further 2 minutes. Excessively vigorous mixing should be avoided as this can lead to undesirable air entrainment. If the mixing area is not adjacent to the laying area the time required to transfer the mixed material will reduce the open installation time. Remember to always use the correct PPE. Pour all the mixed material into roller tray. Using either a low-loss medium pile synthetic roller, or dense foam rubber squeegee, distribute the material evenly and uniformly to fully coat the surface. Finish using a roller to ensure that a uniform and even coverage is achieved.

Fully pre-mix the flakes until they are uniformly distributed, prior to blinding the floor. Wearing spiked shoes immediately fully blind the wet Altro Tect with the flakes. Care must be taken to completely obliterate the wet Altro Tect with the knowledge that as this is high build coating some of the flakes will be fully absorbed into the coating. When finished go back and over blind areas where the flakes have become overly absorbed into the Altro Tect.

NOTE it is very difficult to scatter flakes across a floor evenly; a full blind is the only way to get even coverage of flakes.

Allow the system to cure for a minimum of 18 hours at 20°C, but no longer than 24 hours at 20°C. Remove all excess flakes by brush and vacuum. Take care at this stage to fully removeany loose flakes.

The system must be sealed with Altro Tect standard clear. Ensure the surface of the resin screed is contamination free and all loose flakes are removed and thoroughly vacuumed as necessary. Pour the contents of the hardener into the base unit, and using a slow speed drill and paddle thoroughly mix the contents for 2 minutes. Apply the Altro Tect standard clear to the system using a dense polypropylene foam squeegee or short nap roller, taking time to ensuring that all the flakes are covered. Roll the surface with a short nap synthetic roller to remove all excess and leave to cure for not longer than 24 hours at 20°C. Mix and roller apply the following Altro Tect standard clear coat(s) to leave a uniform closed film across the floor where all excess is removed. Failure to remove excess may affect the slip resistance and appearance of the finished system.

The Altro Mosaic standard matt and Altro Mosaic vertical matt variants incorporate a third coat of Altro Tect standard clear and a final Altro Seal water based matt to achieve a cosmetic matt finish. The application of a single coat of Altro Seal water based matt can be applied not more than 24 hours at 20°C following the final seal. Pour the contents of the hardener into the base unit, and thoroughly mix using a slow speed drill and paddle for 2 minutes. Apply a very thin coat using a short nap synthetic roller applying the product to the floor from a paint tray. Heavy application of this seal will result in an opaque appearance of the finished floor; therefore care is required in its application.

Ensure good air-flow and ventilation to assist with cure. Enough time should be given to allow the Altro Seal water based matt to reach its full chemical cure. Physical drying of the surface alone is not indicative of the full cure properties including wear and chemical resistance.


The spacing of movement joints must be determined by the design of the subfloor. All live movement joints in the subfloor must be continued through the resin flooring. In all instances the type and positioning of movement joints should be agreed at the design stage between all parties concerned. Please refer to Altro or FeRFA’s Guide to the Specification and Application of Synthetic Resin Flooring for further guidance. All joints should be filled with Altro Expand flexible jointing compound. Please see Altro Expand datasheet for further information.


Whilst of an extremely durable nature these floor systems must be thoroughly protected from the rigours and abuse that exist during the ongoing contractual works.

The resin floor should reach full chemical cure in 7 days at 20°C. Untreated felt paper will suffice as protection from light traffic, however if protection is required from other trades then the following protection option should be considered. Where heavier access is required then a more suitable medium to take the loadings, such as shuttering ply or Correx by Cordek, should be placed on top of the untreated felt paper. The resin system should have cured for at least 48 hours prior to placing the protection. No polyethylene sheets, linseed-treated hardboard, print or dyed card should be placed in contact with the resin surface. All joints in the protection medium should be taped, and all accidental spillages should be recovered immediately by removal and reinstatement of the protection. Damage will occur to the system if ignored.

Cleaning (during installation)

All tools and equipment should be regularly cleaned using Altro Solve EP to reduce build up and maintain the quality of the installation. Avoid contamination of the resin surface with solvent as this may cause localised bloom to occur. Ensure that the correct PPE is worn at all times.


Due diligence must be adopted if accidental spillages occur. Recover using absorbent granules, transferring into a suitably marked container. Disposal of all empty containers and accidental spillages should be in accordance with the local waste disposal authority.

Cleaning guidance

Optimum slip resistance can only be maintained with regular cleaning. The texture of the surface will require mechanised cleaning with an Altro Unipad™ or the use of a long-handled scrubbing brush; mop cleaning will not be effective. Steam cleaners and / or hot pressure cleaners should not be used on the floor or walls. A cold / ambient pressure washer may be used if required, but the pressure should not exceed 1400psi. Warm water will offer improved cleaning, but the water temperature should not exceed 60°C.

  • Sweep or vacuum the floor to remove debris
  • For normal cleaning, dilute an alkaline detergent, such as Altro Clean 44 or similar, by 1:40 in clean water. Alternatively, dilute by 1:10 for infrequent heavy cleaning
  • Liberally apply the water and detergent solution to the floor, scrubbing with a deck scrubber or slow-speed (< 400rpm) scrubbing machine and Altro UniPad or similar
  • Pay particular attention to areas where residues may accumulate, such as internal corners of perimeter coves and around columns
  • If possible, allow the detergent solution to remain on the floor for several minutes to break down deposits, but not sufficiently long to allow the solution to evaporate
  • Remove the solution by wet vacuum recovery and follow this with a fresh water rinse, or rinse the solution into drains if permissible
  • It is important that all detergent residue is removed from the textured surface of the floor. Detergent may become slippery which affects safety, or sticky which attracts and holds more dirt

Altro Clean 44 and Altro Unipads are available through the Resins Sales Desk.

Please refer to the most up-to-date technical documents, including safety data sheets, for the Altro resin variant prior to beginning your installation.

For further information or technical advice
call our Customer Care Centre on 01426 489516
or email:

NOTE: “Altro Ltd” (“Altro”) endeavours to ensure that advice and information given in Product Data Sheets, Method Statements and Material Safety Data Sheets (all known as Product Literature) is accurate and correct. However, where Altro has no control over the selection of its products for particular applications, it is important that any prospective customer, user or specifier, satisfies him / herself that the product is suitable for the intended application. In this process, due regard should be taken of the nature and composition of the background / base and the ambient conditions both at the time of laying / applying / installing / curing of the material and when the completed work is to be brought into use.

However, as site conditions and the execution of the work are beyond our control, we accept no resultant liability.

Altro’s policy is one of continuous research and development and we reserve the right to update our products and information at any time without prior notice.