Polyurea Membranes

Polyurea Membranes

Product Manuals
01. Polyurea Technology_Product Manual.xlsx

1. Introduction

Polyurea is a high-performance, two-component, spray-applied elastomer created by the rapid reaction of isocyanates and amine-terminated resins. It is applied with plural-component hot spray machines and cures within seconds, forming a seamless, joint-free, highly elastic, and chemically resistant waterproofing layer.

Polyurea is considered the gold standard for heavy-duty waterproofing where extreme durability, chemical resistance, and tensile strength are required.

2. Advantages

  • Ultra-fast curing (walkable within 3-5 secs).
  • High elongation (>600%) + tensile strength (>15 MPa).
  • Seamless, joint-free finish (spray applied).
  • Superior chemical resistance (ETPs, STPs, industrial floors).
  • Excellent abrasion and impact resistance.
  • Outstanding crack bridging (≥3 mm).
  • UV-resistant topcoat available for exposed conditions.
  • Long service life (15–20+ years).

3. Limitations

  • Requires expensive plural-component spray equipment.
  • Needs skilled applicators (trained crews).
  • Higher cost than PU or cementitious.
  • Substrate preparation is critical (shot blasting/grinding + primer).
  • Sensitive to substrate moisture unless correct primers are used.

4. Recommended Use Cases

  • Effluent Treatment Plants (ETPs) & Sewage Treatment Plants (STPs) → chemical, biological, and continuous immersion exposure.
  • High-area terraces & podiums → rapid application + long service life.
  • Industrial floors & tank linings → chemical & abrasion resistance.
  • Water-retaining structures → reservoirs, tunnels, aqueducts.
  • Bridge decks, parking decks → heavy vehicular loads.

5. Performance Parameters

Property
Typical Polyurea Values
Standard
Tensile Strength
≥15–20 MPa
ASTM D412
Elongation
≥800%
ASTM D412
Tear Strength
≥70 kN/m
ASTM D624
Shore Hardness
85–95 (A/D scale depending on grade)
ASTM D2240
Crack Bridging
≥3 mm
ASTM C836
Abrasion Resistance
<50 mg loss
ASTM D4060
Hydrostatic Pressure Resistance
≥10 bar
ASTM D5385
Chemical Resistance
Excellent (alkalis, effluents, mild acids)
ASTM D543
Potable Water Suitability
NSF/BS 6920 certified grades available
NSF/EN 1508

6. Application Methodology

  1. Surface Preparation → Shot blasting or mechanical grinding; substrate must achieve CSP 3–4 (ICRI profile).
  2. Primer → Apply moisture-tolerant epoxy or PU primer; sprinkle silica sand for key.
  3. Spray Application → Plural-component spray machine, pre-heated hoses; apply polyurea in multiple passes to achieve 2–3 mm DFT.
  4. Detailing → Reinforce joints, penetrations, and corners with geotextile or pre-strips.
  5. Topcoat (if exposed) → UV-resistant aliphatic PU topcoat applied within 24 hrs.

5. Video Masterclass

SpecX Masterclass: Polyurea Membranes — Coming Soon

Disclaimer

SpecX is an industry initiative & a neutral resource, compiled from industry references and best practices. It is not brand-specific. Always cross-check with project requirements and local codes before finalizing specifications.