Description
Characteristics & Advantages
• Easy to use, only mix with cement on the job site
• Excellent adhesion and durability
• Crack resistance
• Good flexural strength
• Good impact strength
• Freeze-thaw resistance
• Vapour permeable
• Low alkalinity
• Excellent water resistance
• Non-toxic and environmentally friendly
Pot Life / Shelf life
Shelf Life: Best before 12 months from date of production if stored properly in undamaged, unopened, original sealed packaging.
Uses
• Mix with cement based adhesive for fixing ceramic tiles, marble, slate and natural stone onto concrete, cement render and rendered brickwork surfaces
• Mix with neat cement and sand as a slurry bond coat to fix rendered or bed tiles over uneven concrete
• For plastering works
• As a primer, seals surface dust, improves water resistance & acts as a bonding agent before fixing tiles. It also aid in bonding prior to application of self-levelling compounds.
Surface Preparation
Substrates: All the substrate surfaces must be clean, free from grease, oil, laitance, and remove all the dirt and contaminants, which might affect adhesion. The impurities outside the structure body should be cleaned thoroughly. It is recommended to give substrate a rough or light-broom finish for better bonding strength.
Insulation board: Insulation board must be well protected, clean, dry, and free of all bond-inhibiting materials and rasped if necessary before installation.
Application
• Apply with spray equipment or apply manually with a stainless steel and trowel to an approximate thickness 3mm onto the insulation board.
• Work horizontally or vertically in strips of 1m and immediately embed fibreglass reinforcing mesh in the wet Obaproof Latex 999 by troweling from the centre to the edges of the mesh. Each strip of mesh should overlap a minimum of 100mm.
• Avoid wrinkles in the mesh and smooth the base coat to eliminate trowel marks.
• Minimum recommended thickness of the reinforced base coat is 1.5mm when dry.
• Reapply an additional base coat to completely cover the mesh as soon as the first coat is dry.
Mixing
“Mixing Ratio and Coverage:
Thick Bed Mortar:
1 Bag Portland cement (50kg),
3 Parts sand (150kg).
Obaproof Latex 999 (20kg).
Coverage: approximately 1m² to a depth of 100mm.
Dry Mortar:
1 Bag F1-388 (25kg),
Obaproof Latex 999 (5kg)
Coverage: approximately 6m² with 3mm bed.
Mixing:
Obaproof Latex 999 should be mixed thoroughly with normal Portland cement or white cement by using a low speed electrical or pneumatic power stirrer. Mixing time is minimum
3-4minutes until a homogeneous mix is achieved.
Mixing Ratio:
Obaproof Latex 999 : 1
Cement : 2.5
Adjust the mix if necessary by adding a small amount of clean water to achieve the desire textured finish. Avoid re-tempering after mixing of product.”
Note
• Minimum ambient and substrate temperature is 5°C during application and drying period.
• Do not apply on weather-exposed horizontal areas or where water immersion may occur.
• Do not apply it as a finish coating.
• Do not apply directly over wood surfaces.
Cleaning of Tools
Remove unhardened Obaproof Latex 999 products from tools and equipment with water immediately after use. Hardened material can only be removed mechanically.
Technical Data
• Working Time (at 25°C) : 40 mins
• Drying Time (at 25°C) : 6 hours
• Curing Time (at 25°C) : 12 hours
• Bond Strength on concrete (7 days): 15 kgf/cm²
• Bond Strength on polystyrene board (Pull-out-Strength): 3 kgf/cm² Failure in polystyrene board
• Consumption (Exclusive of cement): 3 kg/m²
• Water absorption (%) (ASTM C413): 0.03 kg/m² × h0.5
• Permeability
-Positive water pressure: 15 bar
-Negative water pressure: 3 bar
• Application temperature: 5°C to 35°C
Safety
Obaproof Latex 999 contains cement and is alkaline. Suitable precautions should be taken to minimise direct contact with skin.
Applicators are recommended to wear rubber gloves and goggles when using the material. If the material gets into the eyes, flush immediately with clean water and seek medical attention if irritation persists.