Polyurea Rayston X5: Expansive Polyurea for Roofs and Uneven Substrates
Polyurea Rayston X5 is an expansive polyurea for hot-spray waterproofing. It grows to 3–5 times its initial volume, filling cracks and levelling irregular substrates.
- Product: Polyurea Rayston X5
- Application: hot-spray waterproofing
- Mix: A=100 : B=110 by weight / A=100 : B=100 by volume
- Cream time: 7–8 s at 25 °C
01 · Uses
Uses of an expansive polyurea
- Waterproofing of non-trafficable roofs or roofs with light foot traffic.
- High-yield first coat that improves adhesion and levels the substrate before a polyurea layer.
- Walking-comfort layer in flooring, or a continuous membrane for impact-sound reduction.
Rayston X5 also appears in asbestos-cement roof work – see asbestos encapsulation with an ETA.
02 · Application
Application of Polyurea Rayston X5
Mix ratio is A=100 : B=110 by weight (A=100 : B=100 by volume). Standard dosage is 1–1.5 kg/m², which builds a membrane more than 5 mm thick. Cream time is 7–8 s at 25 °C and 4 s at 50 °C.
Recommended temperatures are 60 °C for both components at roughly 100–120 bar, on a substrate between 10 °C and 40 °C.
Technical datasheet: Polyurea Rayston X5 TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Polyurea Rayston X5 technical data (TDS values)
Density
200 kg/m³
Shore hardness
45–50A
Max. elongation
>125%
Tensile strength
1.7 MPa
Technical data
- Density after curing: 200 kg/m³
- Hardness (Shore): 45–50A (ISO 868)
- Max. elongation: >125%
- Tensile strength: 1.7 MPa (UNE EN ISO 527-1/3)
- Tear strength: 7.7 N/mm
- Static puncture: P3 at TH3 (EOTA TR-007)
- Adhesion: 1 MPa on concrete; 1.1 MPa with Epoxy 100 primer
- Static crack-bridging: class A5 (EN 1062-7)
- Water vapour resistance factor: μ = 1069 (EN-ISO 7783:2012)
- Watertight at 10 kPa, 1 m water column (EN 1928)
- Thermal conductivity: 0.044 W/m·K at 10 °C (ASTM 518)
- Impact-sound reduction (10 mm): ΔLw (CI,Δ) 23 (−11) dB
- External fire: Broof(t1) (EN 13501-5)
Approvals
- CE marking to EN 1504-2: 0370-CPR-2247
- Asbestos encapsulation certificate (with a pigmented Colodur or Impermax A topcoat)
04 · Performance
Polyurea Rayston X5 performance
The result is a continuous, flexible membrane with a density of 200 kg/m³, hardness 45–50A (ISO 868), elongation above 125%, tensile strength 1.7 MPa and tear strength 7.7 N/mm.
Static crack-bridging is class A5 (EN 1062-7) and the membrane is watertight at 10 kPa (1 m water column, EN 1928). Thermal conductivity of 0.044 W/m·K and a 23 dB impact-sound reduction at 10 mm add value beyond waterproofing.
Application data
- Mix ratio: A=100, B=110 by weight; A=100, B=100 by volume
- Cream time: 7–8 s at 25 °C, 4 s at 50 °C
- Recommended temperatures: component A 60 °C, component B 60 °C
- Pressure: about 100–120 bar
- Standard dosage: 1–1.5 kg/m² for a membrane thicker than 5 mm
- Substrate temperature: 10–40 °C
05 · FAQ
Polyurea Rayston X5: frequently asked questions
What does "expansive polyurea" mean?
Polyurea Rayston X5 expands to 3–5 times its initial volume as it reacts, so it fills cracks and evens out rough substrates.
How much do you apply?
The standard dosage is 1–1.5 kg/m², giving a membrane over 5 mm thick.
Is it suitable for foot traffic?
It is intended for non-trafficable roofs or light foot traffic, and as a comfort or impact-sound layer under flooring.
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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