MASTERTOP 1250 Plus  

 Description

MASTERTOP 1250 Plus is a multi component epoxy system designed to provide continuous protection for concrete floors in medium to heavy duty situations. Applied by trowel in thicknesses of 5mm and above.

 Primary uses

MASTERTOP 1250 Plus floors have excellent mechanical properties and offer superior abrasion and wear characteristics for areas subjected to heavy traffic.

MASTERTOP 1250 Plus has good general chemical resistance, but as in all corrosive situations a full analysis of operating and exposure conditions is required, followed by reference to chemical resistance data, to ensure product suitability.

MASTERTOP 1250 Plus is non-tainting and is suitable for application where foodstuffs are processed and stored.

In continuously wet areas, MASTERTOP 1250 Plus floors offer improved safety by providing a slip resistant finish.

MASTERTOP 1250 Plus is used extensively in the following industries:

• Kitchens
• Food production
• Canteens
• Vegetable and fruit canning
• Bakeries and confectioners
• Schools
• Shops and showrooms
• Changing rooms / showers

Advantages

• High mechanical strength
• Impact and abrasion resistant
• Slip resistant
• Non tainting
• Excellent chemical resistance

Product components

MASTERTOP 1250 Plus is supplied as a multi component system

To order:

Typical properties

Application procedure

Preparation:

MASTERTOP 1250 PLUS must be applied to a clean, dry substrate free from dust, dirt, oil, grease and other contaminants. A clean well prepared surface will ensure adhesion between substrate and overlay.

The method of surface preparation will be dictated by the size of area to be treated, location and degree of contamination. Specialist finishes should not be applied to concrete which contains more than 5% moisture by mass. The substrate can be considered sufficiently dry only when the Relative Humidity (RH) at the surface falls to 75% or less when measured with a hygrometer to BS 8201 : 1987 Appendix A.

New construction:

Floors to be coated or overlaid should be at least 28 days old unless water reducing admixtures have been incorporated. Consult BASF-ME's Technical Services Department for advice.

The removal of laitance and contaminants is best achieved by mechanical means such as vacuum recovery shot blasting or scarifying.

Existing concrete:

All contamination must be removed and a sound, clean substrate exposed. Mechanical means of preparation are preferred followed by the removal of dust and other loose debris using an industrial vacuum.

In areas of deeply penetrating contamination by oils, greases and fats, hot compressed air, followed by impregnation with a low viscosity sealer / primer is the recommended treatment.

Uneven concrete should be levelled to produce a roughened flat surface. For heavy wear situations a suitable repair mortar or epoxy screed from the EMACO or MASTERTOP ranges should be used.

Expansion, control and isolation joints in concrete substrates should be carried through MASTERTOP 1250 PLUS floors and filled with a suitable sealant from the MBT-ME range.

At all details where MASTERTOP 1250 PLUS will terminate, for example, at expansion, control or movement joints, at doorways, channels or columns, the material must be given a mechanical bond to the substrate using tie chasers. Tie chasers are grooves cut in existing concrete about 20mm deep and wide. Tie chasers can be cast during initial construction using polythene coated timber battens or cut prior to surface preparation.

Prior to application MASTERTOP 1250 PLUS should be stored under cover in dry conditions and protected from extremes of temperature which may cause inconsistent workability, finish and cure times of the mixed material. Ideally, at least 24 hours before mixing, MASTERTOP 1250 PLUS should be maintained at approximately 20°C.

Priming:

Mix the base and reactor components together until streak free. Apply by brush or roller at the minimum rate of 0.2kg/m² to the prepared substrate. Primer consumption will vary according to substrate profile and porosity.

If the primer is readily absorbed by the concrete, the surface must be reprimed, to leave a surface with a wet or tacky glossy appearance at the time the MASTERTOP 1250 PLUS is laid into the primer.

It may be preferable to pre-prime porous surfaces, allowing the first coat of primer to dry and seal the surface, before repriming again the next day. If this approach is taken, SRA Aggregate No. 3 should be sprinkled into the first sealer / prime coat to afford a key to prevent the MASTERTOP 1250 PLUS sliding about when it is applied into the second primer coat.

Mixing screed:

Mixing can be carried out using a forced action mixer or drill and spiral paddle. The drill should be rated at 900 watts or more, preferably reversible, with variable speed.

Mix the base and reactor together until streak free. Pour the mixed material into the mixer, then with the mixer operating, add the aggregate. Continue mixing until all the aggregate is coated with resin.

Application:

Place the mixed MASTERTOP 1250 PLUS onto the wet primer, between screed battens of the correct thickness, spread and level off using an aluminium straight edge. Compact and finish the surface using a steel float. Allow to cure.

Coving and skirting:

Mix the MASTERTOP 1250 PLUS resin with the thixotropising filler, then add the 25kg bags of aggregate and mix for 3 minutes.

Apply the coving into wet or tacky primer.

Topcoat:

The surface of MASTERTOP 1250 PLUS must be sealed using MASTERTOP 1250 PLUS base and reactor and adding the prepacked thixotropising powder.

When the surface is hard enough to walk on, remove protruding aggregates from the finished surface, prior to applying the sealer / top coat.

Mix the base and reactor and the thixotropising powder using a paint mixing head fitted to a drill. Mix until lump free.

Apply using a squeegee (wiper) forcing the top coat into the voids in the surface, then roll with a short hair roller to make the surface uniform. Allow to cure. A second sealer coat can be applied if required using the MASTERTOP 1250 PLUS resin but without the thixotrope.

MASTERTOP 1375 polyurethane top coat can be applied on top of the sealed surface to give a satin/matt finish with improved slip resistance.

Good curing is essential for resin-based materials to ensure specified performance. A minimum temperature of 10°C should be maintained during the curing period by the use of additional heating, if necessary.

Coverage

The following MASTERTOP 1250 PLUS coverage rates have been calculated using theoretical and practical data.

Priming :

MASTERTOP 1240 PLUS / 1250 PLUS Primer 2.8 kg gives 4-6m²/kg.

Overlay:

MASTERTOP 1250 PLUS systems

Laid at 5mm 27.8kg pack covers 2.9m².

Yield

27.8Kg = 14.63 litres

Top coat:

2.93kg including thixotrope covers approx. 14m².

All calculated usages assume constant thickness on a regular substrate. Failure to achieve the required surface regularity will lead to additional material being used.

Equipment care

Remove uncured MASTERTOP 1250 PLUS using CLEANING SOLVENT NO. 2.

Storage

Store out of direct sunlight, clear of the ground on pallets protected from rainfall. Avoid excessive compaction and protect from extremes of temperatures. In tropical climates the product must be stored in an air conditioned environment. Shelf life is more than 1 year when stored as above.

Failure to comply with the recommended storage conditions may result in premature deterioration of the product or packaging. For specific storage advice consult BASF ME's Technical Services Department.

Safety precautions

As with all chemical products, care should be taken during use and storage to avoid contact with eyes, mouth, skin and foodstuffs (which can also be tainted with vapour until product is fully cured or dried). Treat splashes to eyes and skin immediately. If accidentally ingested, seek medical attention. Reseal containers after use.

Note

Field service, where provided, does not constitute supervisory responsibility. For additional information contact your local BASF representative.

BASF reserves the right to have the true cause of any difficulty determined by accepted test methods.

Quality and care

All products originating from BASF's Dubai, UAE facility are manufactured under a management system independently certified to conform to the requirements of the quality, environmental and occupational health & safety standards ISO 9000, ISO 14001 and OHSAS 18001.

05/98 BASF-ME revised 06/2001