Product Overview
Matex PRCH is designed for application in thin layers (up to 5mm) to produce a fair-faced appearance on concrete or masonry surfaces. It prepares the surface to receive protective/decorative coatings or can be left exposed.
Key Advantages:
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Excellent Bond: Adheres strongly to concrete substrates.
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Versatile: Can be left exposed or over-coated.
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Site Ready: Pre-blended powder; simply add clean water.
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Safe: Contains no chloride admixtures.
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Fast Acting: Rapid strength development.
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Convenient: No independent primer or curing membrane is required under correct conditions.
Technical Properties
(Typical results at 20°C with Water/Powder ratio at 0.24)
| Property | Test Method | Typical Result |
| Form | N/A | Powder (Grey) |
| Fresh Wet Density | BSEN 12350-6 | 1.90 kg/ltr (+/- 0.05) |
| Working Time | N/A | 30 mins |
| Compressive Strength | ASTM C109 | 45 N/mm² (at 28 days) |
| Bond Strength | ASTM D4541 | >1.5 N/mm² (at 28 days) |
| Flexural Strength | BS 6319-3 | 6 N/mm² (at 28 days) |
| Water Absorption | ISAT-BS 1881-208 | < 0.01 ml/m²/sec (at 2 hrs) |
| Drying Shrinkage | ASTM C 157 | < 500 microstrain (at 28 days) |
| Thermal Expansion | N/A | 7 x 10⁻⁶ |
Supply & Coverage
| Specification | Detail |
| Pack Size | 25 kg Bag |
| Yield | 16 Liters per 25 kg bag |
| Coverage | 16 m² per 25 kg bag (at 1 mm thickness) |
| Shelf Life | 12 months (in original unopened packing) |
Application Instructions
1. Surface Preparation
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Clean surface to remove dust, unsound material, plaster, oil, grease, paint, or algae.
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Roughen the surface (light scabbling or grit-blasting) to remove laitance and expose fine aggregate.
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Blow clean with oil-free compressed air.
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Priming: No independent primer is required.
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Saturation: Thoroughly soak the area with clean water immediately prior to application. Remove residual standing water before starting.
2. Mixing
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Ratio: Use 6 to 7 liters of water for every 25 kg bag (adjust for consistency).
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Method: Use a slow-speed heavy-duty drill with a paddle.
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Duration: Mix for approximately 3 minutes until uniform.
3. Application
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Apply in layers between 1 mm and 5 mm thickness.
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Ensure water does not run onto recently applied material (less than 12 hours old).
4. Cleaning
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Clean all tools and equipment with water immediately after use.
Safety & Storage
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Storage: Store under warehouse conditions. Extreme temperature or humidity may reduce shelf life.
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Disposal: Do not reuse bags. Dispose of according to local regulations.
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Safety: Avoid contact with skin and eyes.
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Support: MATEX Technical Services are available for onsite support upon request.
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