Method · Liquid-applied waterproofing
Polyurea is sprayed with a heated, high-pressure rig and sets in seconds into a very tough, highly elastic membrane — for water tanks, large areas that must finish fast, and heavy wear.
A 100%-solids coating sprayed with heated, high-pressure equipment. It sets in seconds into a very tough, very stretchy membrane.
Water tanks (drinking water takes a potable-certified grade), large areas that must be finished fast, and surfaces that take hard wear.
Needs a spray rig and a trained crew. Standard (aromatic) polyurea is not UV-stable, so exposed areas get an aliphatic top coat.
Layers (built up from the bottom)
Shields the membrane from UV, limiting fading and ageing.
A seamless membrane that sets in seconds and stretches to bridge cracks.
Penetrates the concrete so the membrane bonds firmly.
Clean, dry concrete, ready to receive the system.
The figure shows one typical build-up. The actual layers are decided after we see the site.
Substrate moisture is measured before spraying; the system is chosen for damp or dry substrates accordingly.
Polyurea is sprayed on and the dry film thickness is measured.
A pull-off adhesion test and a water test (1–2 days) before handover.
Liquid membranes are chosen by where they go and the conditions on site. If another one fits better, we will say so.
| Membrane | Strength | Where |
|---|---|---|
| Acrylic (water-based) | Paint-like, cheapest | Roof, exterior wall |
| Bituminous Liquid | Liquid asphalt, low-cost, below ground | Below ground |
| Polyurethane (PU) | Flexible; Aliphatic grades are UV-stable | Outdoor — roof, deck |
| Polyurea — Pure / Hybridthis page | Sets in seconds; drinking-water tanks take a potable-certified grade | Water tanks |
| Silicone | Very UV-resistant; ideal over existing membranes | Over existing membranes (repair) |
| PMMA (Methyl Methacrylate) | Works through the rainy season, rain-resistant in about 30 minutes at 20 °C | Metal-sheet roof, deck, roof garden, joints |
| STPE | Goes onto damp (not wet) substrates | Basins & pits, enclosed damp areas, non-absorbent substrates |
Also with this method:Stock Exchange of Thailand (SET), Bangkok · PTT CCR3 · PTT Central Substation · PTT GSP3 New Substation · PTT IPG3 · PTTTLNG (PTT LNG) · PTTGC-ALPLA Plastic Recycling Plant · Angsana Laguna Phuket · Asakan Place Srinakarindra · PTT GSP2 and GSP6 Plants, Rayong · PTT CCR5
The area, the state of the substrate (cracks, wet spots, or an old membrane to remove), the system and number of layers, whether it is exposed to the sun, and the hours we can work. Send photos and drawings on LINE and we will check the site and quote.
For drinking water we use a grade certified for potable water (for example NSF/ANSI 61), at the certified thickness. Standard (aromatic) polyurea is not UV-stable, so exposed areas are finished with an aliphatic top coat.
Substrate moisture is measured before we apply, and the system is chosen for damp or dry substrates accordingly. For basins, pits and enclosed damp areas there is STPE, which goes onto damp (not wet) substrates, often with no primer.
Send the area, the substrate and a few photos. We check the site and propose the membrane that fits.
Only want materials? psw-chemical.com ↗TEL +66 2 552 6468 · sales@passawarn.com