I. DESCRIPTION:
TPI Primer MB is a two-component, solvent-free, epoxy-based moisture barrier primer with low viscosity.
It is used as a primer for concrete surfaces in areas that cannot be completely dry before applying an epoxy floor coating.
II. APPLICATIONS:
TPI Primer MB is suitable for the following applications:
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Primer for concrete substrates, cement mortar, and epoxy mortar when the surface cannot be completely dry.
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Prevents moisture rising to the concrete surface.
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Acts as a moisture-resistant primer for epoxy flooring systems.
III. ADVANTAGES:
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Easy to apply, short application time.
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Non-toxic. Solvent-free, suitable for restricted areas.
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Low viscosity, good penetration ability.
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Excellent adhesion.
IV. TECHNICAL DATA:
| Properties | TPI Primer MB |
|---|---|
| Composition | Liquid epoxy |
| Color | – Part A: Resin – yellow, light brown – Part B: Hardener – transparent |
| Density | – Part A: ~ 1.15 kg/L – Part B: ~ 1.01 kg/L – Mixture: ~ 1.10 kg/L |
| Packaging | – Part A: 10kg/pail – Part B: 5kg/pail – A + B: 15kg/set |
| Mixing ratio | 2 : 1 (by weight) |
| Adhesion strength | > 1.3 N/mm² |
| Consumption | 0.2 – 0.4 kg/m²/layer |
| Application temperature | 10 – 30ºC |
| Curing time | – Touch dry: 80 – 180 minutes – Recoating interval: 8 – 20 hours – Full cure: 7 days |
| Shelf life | 24 months (unopened packaging) |
| Storage | – Packaging must be intact, unopened, and undamaged – Store in cool, shaded, dry conditions at 10ºC – 35ºC |
V. APPLICATION INSTRUCTIONS:
Surface Preparation:
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Concrete surface must be sound, with minimum compressive strength of 25 N/mm² and adhesion strength of at least 1.5 N/mm².
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The surface must be clean, dry, free from contaminants such as dust, oil, grease, old coatings, or curing compounds.
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Weak concrete and dust must be removed. Surface defects such as holes, cracks, and protrusions must be repaired and leveled.
Moisture Check and Primer Application:
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Check surface moisture, relative humidity, and dew point before application.
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When surface moisture ≥ 4.5%, use TPI Primer MB as a moisture barrier primer.
Mixing Procedure:
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TPI Primer MB is supplied as a two-component system: base component A and hardener B.
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Stir component A thoroughly before mixing. Add component B into component A and continue mixing for 3 minutes until a homogeneous mixture is obtained.
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Avoid over-mixing to minimize air entrapment.
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Use a slow-speed mixer (300–400 rpm) or other suitable mixing tools.
Primer Application:
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Ensure complete and continuous coverage of the substrate.
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For low/medium porosity concrete: 1 coat of TPI Primer MB is sufficient.
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For high porosity concrete: apply 2 coats of TPI Primer MB (perpendicular directions).
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Application methods: brush, short-nap roller, or squeegee.
Cleaning:
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Clean tools and equipment immediately after use.
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Once cured, the product can only be removed mechanically.
IMPORTANT NOTES:
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Do not substitute the primer with other products.
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Primer must be applied evenly across the surface.
VI. HEALTH & SAFETY INFORMATION:
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Personal Protection: Wear appropriate protective clothing, goggles, and gloves during application. May cause allergic reactions upon contact with eyes, skin, or mucous membranes.
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Ecology: Do not discharge into waterways or soil.
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Transport: Not classified as hazardous.
Refer to the Material Safety Data Sheet (MSDS) and other relevant safety documents.