Impermax Polyurea H Flex: Hot-Spray Polyurea for Bridge Decks and Roofs
Impermax Polyurea H Flex is a flexible two-component membrane – a hot-spray polyurea for bridge decks, roofs and liners – applied with plural-component equipment, with an outstanding crack-bridging capacity and a European Technical Assessment for bridge-deck waterproofing.
- Product: Impermax Polyurea H Flex
- Application: hot-spray waterproofing
- Mix: A=1 : B=1.08 by weight / 1:1 by volume
- Gel time: 8–9 s at 25 °C
- Colours: light grey, dark grey, rust red, blue
01 · Uses
Uses of a hot-spray polyurea for bridge decks, roofs and liners
- Waterproofing of concrete structures and bridge decks.
- Roof waterproofing, with the option to complete the system with a UV-resistant topcoat.
- Containment liners for ponds, secondary containment tanks, reservoirs, landfills, tunnels, channels and dam repair.
See it on site in the Colmenar M-40 bridge, the Tordera railway bridge and an underground car park.
02 · Application
Application and key properties
Liners made with Impermax Polyurea H Flex and selected geotextiles reach a static puncture resistance above 3200 kN (UNE EN ISO 12236:2007, as stated on the datasheet). The membrane is watertight at 60 kPa (a 6 m water column, EN 1928).
Static crack-bridging is class A5 at 23 °C and -10 °C, dynamic crack-bridging class B4.2 at -20 °C (EN 1062-7). The reference spray rate is 2 kg/m². How bridge-deck membranes are assessed is covered in our ETAG 033 bridge deck article.
Technical datasheet: Impermax Polyurea H Flex TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Impermax Polyurea H Flex technical data (TDS values)
Elongation at break
400%
Tensile strength
15 MPa
Shore hardness
90A/40D
Tear strength
43 N/mm
Technical data
- Hardness (Shore): 90A/40D (ISO 868)
- Elongation at break: 400%
- Tensile strength: 15 MPa (EN-ISO 527-3)
- Tear strength: 43 N/mm (ISO 34-1)
- Static puncture: above 3200 kN for liners with selected geotextiles (UNE EN ISO 12236:2007)
- Water vapour resistance factor: μ = 5933 (EN-ISO 7783:2012)
- Liquid water permeability: W = 0.002 kg/m²·h0.5 (EN 1062-3:2018)
- Abrasion: 22 mg (Taber, CS17, 1000 cycles, 1 kg)
- Impact: 24.5 N·m, Class III > 20 N·m (EN ISO 6272-1)
- Crack-bridging: static A5 at 23 °C and -10 °C; dynamic B4.2 at -20 °C (EN 1062-7)
Approvals
- ETA 21/0740 (EAD 030675-00-0107) for bridge-deck waterproofing, CE marked
- ATG 3247 (Belgium) for bridge-deck waterproofing
- Reaction to fire: Class B2 (DIN 4102-1:1998)
- External fire performance: Broof(t2)
- Hail resistance (EN 13583)
04 · Performance
Impermax Polyurea H Flex performance
According to the datasheet, the membrane has a hardness of 90A/40D (ISO 868), tensile strength of 15 MPa and elongation at break of 400% (EN-ISO 527-3), and tear strength of 43 N/mm (ISO 34-1).
Combined with its ETA for bridge decks, its low liquid water permeability and its dynamic crack-bridging at -20 °C, this is the Impermax membrane to look at when the structure moves and traffic loads are involved.
Application data
- Mix ratio: A=1, B=1.08 by weight; A=1, B=1 by volume
- Gel time (A+B, 20 g): 8–9 s at 25 °C, 4–6 s at 60 °C
- Recommended temperatures: component A 70 °C, component B 70 °C, hose 65 °C
- Spray pressure: at least 135–170 bar
- Reference spray rate: 2 kg/m²
- Return to service (25 °C, 50% RH): rain-resistant after 15 min, light foot traffic after 1 h
05 · FAQ
Impermax Polyurea H Flex: frequently asked questions
Is Impermax Polyurea H Flex approved for bridge decks?
Yes. It holds ETA 21/0740 (EAD 030675-00-0107) with CE marking, plus Belgian ATG 3247, both for bridge-deck waterproofing.
What crack-bridging class does it reach?
Static class A5 at 23 °C and -10 °C, and dynamic class B4.2 at -20 °C, tested to EN 1062-7.
How soon can it take foot traffic?
At 25 °C and 50% RH it resists rain after 15 minutes and light foot traffic after 1 hour.
More Impermax and Rayston polyurea products
Every product page in this series is based on its official Krypton Chemical technical datasheet.
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