CASTECHPROOF PU-2K
Two-Component Aliphatic Polyurethane Liquid Waterproofing Membrane – UV Stable
CASTECH Proof PU-2K is a high-performance, aliphatic polyurethane coating designed for waterproofing and protective applications. Composed of Polyol (Part A) and Isocyanate (Part B), it forms a seamless, UV-resistant membrane with exceptional chemical and abrasion resistance.
Overview
About
CASTECH Proof PU-2K is a high-performance, aliphatic polyurethane coating designed for waterproofing and protective applications. Composed of Polyol (Part A) and Isocyanate (Part B), it forms a seamless, UV-resistant membrane with exceptional chemical and abrasion resistance.
Typical uses
- Roofing systems (combo roofs, terraces)
- Balconies, parking decks and pedestrian walkways
- Industrial floors (chemical resistant)
Benefits
Advantages
Key advantages
- UV resistance – retains colour and gloss under sunlight
- Chemical resistance – withstands oils, acids and alkalis
- Fast curing
- Abrasion resistance
- Hydrolysis resistance – suitable for humid climates
- Easy application by brush, roller or spray
Technical data
| Nature | Two components |
|---|---|
| Colour | Desired shade |
| Mix Density | 1.05 ± 0.02 g/cm³ |
| Mixing Ratio (R : H), pbw | 80 : 20 |
| Solids | 55 ± 2% |
| Complete Curing Time | 7 days |
| Hard Dry Time | Overnight |
| Tack-Free Time | 3 – 4 hours |
| Surface Dry Time | 1 – 2 hours |
| Pot Life @ 25°C | 45 – 60 minutes |
| Gloss (ASTM D523) | 40 (60° Gardner), semi-gloss |
| Adhesion (ASTM D4541) | 2.5 MPa on primed surface |
| Shore D Hardness (ASTM D2240) | 75 ± 5 |
| Abrasion Resistance (ASTM D4060) | 45 mg loss after 1000 cycles, CS-17 wheel |
| Chemical Resistance (ASTM D543) | Good overall |
| UV Resistance (ASTM G53) | 1000 h – no loss of gloss, no colour change |
| Solar Reflectance Index (EN 410) | 85% |
Typical values. Refer to the TDS for full details and test conditions.
Application
Surface preparation
Long-term durability is determined by the bond achieved between the coating and the substrate, so substrates must be correctly prepared. New concrete: at least 28 days old with a moisture content below 5%, sound and free from oil, grease, mortar and paint splashes or curing compound residues. Remove laitance by light mechanical scabbling, grinding or grit/captive blasting, followed by vacuum cleaning. Old concrete: remove laitance as above. Remove oil and grease with a proprietary degreaser or hot compressed air. Repair damaged areas or irregularities with suitable Priming: not normally required on sound, untreated, good- quality non-porous concrete. If in doubt, or if porous, prime with CASTECH PU Primer.
Mixing
Stir Component A with a jiffy mixing blade on a low-speed drill (200 – 300 rpm) to disperse any settlement. Pour all of Component B into Component A, scraping the container, and mix thoroughly to a streak-free, uniform colour. Use immediately after mixing; working time decreases as Liquid Waterproofing temperature increases.
Application
Apply immediately to the dry surface as a continuous coating of uniform thickness using a stiff nylon brush or short-nap roller, or airless spray for faster rates. Use a brush for touch-up and edging. Apply sufficient material to achieve the specified dry film thickness. Coverage: 5 – 6 m²/L at 70 – 80 microns wet film thickness. Two coats at right angles are recommended.
Packaging & storage
Packaging
- Packaging: 20 L kits
- Shelf life: 12 months in unopened containers at 25°C
- Storage: cool, dry place, away from direct sunlight
Health & safety
PPE: Wear gloves and goggles; long-sleeve overalls, safety shoes and a face mask are recommended. Precautions: Avoid inhaling the product, as it may irritate the respiratory system. Treat splashes to skin or eyes with fresh water immediately. If swallowed, do not induce vomiting; call for medical assistance and keep the container available the medical attendant. Reseal containers after use. Additional information: Refer to MSDS (available request). for TECHNICAL SUPPORT CASTECH provides on-site assistance and consulting services on on projects when requested. Technical data sheets on other CASTECH products and guidance on their use are available on request.
