Altro clear seals for epoxy screeds

Altro clear seals for epoxy screeds

Technical and installation data sheet

September 2016

Product description

Altro Screed™ seals may be applied to Altro epoxy screeds in order to select the cure-time and / or slip-resistance required of the screed when in service, whilst grouting the screed to ensure a hygienic impervious surface.

The seals become an integral part of the finished Altro epoxy screed and this information should be read in conjunction with the Technical Data Sheet for the Altro Screed variant.

Altro Screed Standard is a solvent-free clear epoxy seal, which seals the surface for hygiene and ease of cleaning, but does not provide an increase in the slip-resistance offered by the aggregate within the Altro Screed.

Altro Screed slip-resistant seal coat offers the performance of Altro Screed standard, with the added benefit of improved slip resistance.

Altro Screed standard Rapicure is a clear solvent-free epoxy seal coat, which offers the performance of Altro Screed standard seal, but with reduced cure-times and more rapid acquisition of resistance to spillage for an enhanced return-to-service time.

Altro Screed slip-resistant Rapicure is a clear solvent-free epoxy, which offers the performance of Altro Screed standard Rapicure, but with reduced cure-times and more rapid acquisition of resistance to spillage for an enhanced return-to-service time, with the added benefit of improved slip resistance.

Altro Seal™ is a clear solvent-based polyurethane screed seal and stand-alone floor seal, which offers a durable silk finish with enhanced chemical resistance.

Altro Seal slip-resistant offers the same performance as Altro Seal, but should be used where additional slip resistance is required.

Altro Seal water based matt is a clear polyurethane seal, applied in a tight roller-coat to provide a matt finish to epoxy screeds, offering a more natural appearance and diffusing some light reflections which highlight slight imperfections or undulations.

(Please note this product should not be applied onto heavily textured surfaces). Altro offer a range of seals and textured systems to meet with a variety of conditions. Please talk to Altro Technical services regarding the requirements of your installation.

Typical areas of use

Altro Screed standard & Altro Screed standard Rapicure

  • Dry areas
  • Internal (dry) circulation areas
  • Classrooms / offices
  • Pharmaceutical & dry work / processing areas

Altro Screed slip-resistant Rapicure

  • Areas where there is risk of a slip
  • Internal circulation areas (with potential for spillage or ingress of moisture)
  • Food, pharmaceutical & general industries
  • School / Leisure changing rooms
  • Custodial areas

Altro Seal Clear & Altro Seal slip-resistant

  • Laboratories
  • Craft and design areas
  • Areas subject to occasional chemical spillage

Altro Seal variants should not be directly applied to the epoxy screeds and should be used in conjunction with Altro Screed standard seal coats.


Altro’s steps to sustainability program seeks to optimise our performance with respect to the planet’s resources. Please refer to for further information.


Altro Screed standard seal is available in a two part composite pack in 5.3kg size.

Altro Screed standard Rapicure seal is available in a two part composite pack in 2.3kg size.

Altro Screed slip-resistant Rapicure seal is available in a three part composite pack in 3kg size.

Altro Seal is available in a two part composite pack in 4kg size.

Altro Seal slip-resistant is available in a two part composite pack in 4.3kg size.

Altro Seal water based matt is available in a two part composite pack in 5kg size.

Typical potential for slip properties

Seal coat Potential for slip category TRRL-Slider 96 (4S) rubber
Altro Screed standard
Altro Screed standard Rapicure
Altro Seal
Altro Screed slip-resistant
Altro Screed slip-resistant Rapicure
Altro Seal slip-resistant


For detailed coverage rates please see the relevant data sheet for the substrate screed.

The coverage rate of Altro Screed seal coats will be directly dependant on the porosity and profile of the compacted screed substrate as well as other contributory factors such as ambient and substrate temperature. Stated coverage rates should be referred to for guidance only and cannot be relied upon to determine exact quantities.


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.

Substrate requirements

Substrates should be dry, structurally sound and free from contamination which may affect either the adhesion or penetration of the Altro Screed seal coats.

Substrate preparation

Thin coatings 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 guidance.


Before proceeding with the installation, careful consideration should determine the best way of installing the Altro screed 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 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 rising up to 25°C. It is not advisable to mix and lay epoxy resin products outside the range 10° to 25°. 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 13°C cure times will be substantially increased unless some form of external heating is used. 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’ and effect subsequent adhesion. 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

Refer to the relevant Screed data sheet for detailed installation guidance. 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.

If the over-coating time period is exceeded, the surface should be lightly abraded and vacuumed before further coats are applied.

After cure ensure that the screed has been fully sealed.Ensure good air-flow and ventilation to assist with cure. Never leave unused material in the bucket to cure as a strong exothermic reaction will occur.


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 data sheet 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.

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 the above guidance is not followed.

Cleaning (during installation)

All tools and equipment should be regularly cleaned using Altro Solve™ 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.

Regular cleaning regime of Altro Resin Flooring systems

Optimum slip resistance can only be maintained with regular cleaning. Please refer to specific data sheet for the Altro Resin Flooring system.

Please obtain the correct Material Safety Data Sheets from Altro prior to beginning your installation.

Always wear correct PPE whilst installing resin products.

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.