Three-Component Polyurethane Primer, Chemically Resistant, Solvent Free.
PU/HPU primer is a three-component, cement modified polyurethane primer specifically designed for use with abe.®screed PU and in combination with abe.®flo HPU. The primer forms a watertight moisture barrier that reduces pin and blow hole formation in subsequent polyurethane applications. The primer is a pore sealerthat provides an excellent bonding surface.
A primer that provides an excellent bond and pore sealer for abe.®screed PU and abe.®flo HPU.
- Excellent chemical resistance
- Excellent adhesion
- Effective pore sealing
- Solvent free
- Low odour during use
- High impact, abrasion, and thermal shock resistance
- Antimicrobial silver ion technology
- Low VOC
- Moisture barrier
- Ideal for food processing areas
The substrate must be concrete or polymer modified screed that provides a minimum of 25 MPa compressive strength and 1.5 MPa tensile adhesion strength.
Remove all previous coatings, unbonded concrete, and laitance mechanically through diamond grinding, abrasive blasting, or scarifying to obtain a sound and porous surface (sandpaper texture). Sweep dust and loose debris followed by vacuuming, to obtain a dry and dust-free surface. It is standard practice to ensure grooves 5 mm by 5 mm, run parallel to and 150 mm from all walls, plinths, finished edges, expansion joints, columns.
Bonding / Priming
PU/HPU primer is recommended as a primer/pore sealer and must be allowed to cure. Priming must be undertaken in the late afternoon (i.e. declining substrate temperature).
***Download technical datasheet to view table of Typical Properties.
Ensure application conditions of 15 to 28 °C. Ensure adequate lighting to achieve an even and level spread. Installation should not be attempted unless the application team is fully trained.
Open both aggregate bags (Part 3) before the mixture starts to ensure no time is wasted between mixes/kits. Shake Part 1 and Part 2 vigorously prior to opening.
Set up the mixing machine as close to the floor as possible (Use two mixing vessels to ensure the time between mixes/kits are minimized).
Start the timer when adding Part 2 and mix for 30 seconds. Once 30 seconds is complete, pour Part 3 into the mix and mix for a further 2 minutes until uniformly wetted out.
Pour out the mix onto the demarcated area and trowel or squeegee out into place. On porous surfaces, apply further resin until the surface is completely wetted out. Trowel out as thinly as possible, leaving just enough to give a wet look. Leave for a minimum of 16 hours and 36 hours in cold winter months before screeding over. Do not allow the cured primer to cure longer than 48 hours before screeding over. (If more than 48 hours have passed, perform a light grind and apply a new layer of primer).
Note: Certain subsequent screeds to be applied require the primed surface to be broadcast with scatter sand. In such cases broadcast the relevant scatter sand at 0.5 to 1.0 kg/m2 into a wet primer coat.
Porous substrates generally consume 30% more primer than usual. Re-priming is necessary when the first coat of primer penetrates leaving a patchy appearance. Re-priming may be done immediately (<30 min.) into wet primer to save time and no longer than 48 hours later.
Covings & Walls
Broadcast silica sand into the wet primer for assistance with bonding on vertical applications.
6.40 litre kit yields approximately 25.5 m2 at 0.25 mm thick, depending on surface roughness.
Regular cleaning extends the service life of the Polyscreed system. Maintenance is to be carried out using Liquid Action which complies with SANS 1344 Medium Duty Solvent Detergent (2112/P3325/10/ID).
Roller should be discarded, but other equipment may be cleaned with abe® super brush cleaner before dried/cured.
Protection on Completion
Protect surface against traffic and spillage until subsequent screeds have been applied and cured.
The primer will be three-component polyurethane primer PU/HPU primer. The floor topping will be either abe.®screed PU or abe.®flo HPU in accordance with a.b.e.® Construction Chemicals’ recommendations.
An important advantage of the Polyscreed range is its silver ion technology which inhibits the growth of bacteria and fungi ensuring a more hygienic surface.
PU/HPU primer is supplied in 5L packs, consisting of base, hardener and aggregate.
|Part 1||2,6 kg||B52200B0026|
|Part 2||2,5 kg||A49501B0025|
|Total Yield 6,4 litre|
Handling & Storage
All PU/HPU primer related products have a shelf life of 12 months if kept in a dry, cool store in the original, unopened packs. If stored at high temperatures and/or high humidity conditions, the shelf life may be reduced.
Health & Safety
When wet, PU/HPU primer is toxic. Ensure the working area is well ventilated during application and drying. Avoid inhalation of dust and contact with skin and eyes. Suitable protective clothing, gloves, eye protection, and respiratory protective equipment should be worn. The use of barrier creams provides additional skin protection. If contact with skin occurs, wash with water and soap. Splashes into eyes should be washed immediately with plenty of clean water and medical advice sought. When cured PU/HPU primer is inert and harmless.
NB: When transporting liquids and semi-liquids by aircraft, ask for a material safety data sheet.
This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® Construction Chemicalsendeavours to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied – accept any liability either directly or indirectly arising from the use of a.b.e.® products, whether or not in accordance with any advice, specification, recommendation, or information given by the company.
Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total requirements. a.b.e.® Construction Chemicals has a wealth of technical and practical experience built up over years in the company’s pursuit of excellence in building and construction technology.