Rayston Spray D50: Pure Polyurea Radon and Methane Barrier Membrane
Rayston Spray D50 is a pure polyurea membrane, free of solvents and mineral fillers, applied with a plural-component spray machine to form a continuous, high-performance waterproofing, radon and methane barrier membrane.
- Product: Rayston Spray D50
- Application: hot-spray waterproofing
- Mix: A=1 : B=1.13 by weight / 1:1 by volume
- Gel time: 4 s at 25 °C
- Colours: light grey, dark grey, rust red, blue
01 · Uses
Uses of a radon and methane barrier membrane
- Water tanks holding highly aggressive, corrosive chemicals; wastewater treatment plants and biogas digesters.
- Secondary containment tanks resistant to chemical spills.
- Foundations with root-penetration resistance, forming a barrier against radon, methane and harmful soil contaminants.
- Protective coating and methane barrier in LNG tanks and biogas facilities, and protection of concrete against carbonation.
Projects: Rayston Spray D50 on a biogas plant, WWTP in Ibiza and our radon gas barrier article.
02 · Application
Application of Rayston Spray D50
Mix ratio is A=1 : B=1.13 by weight (1:1 by volume) and the minimum application rate is 2 kg/m². Recommended temperatures are 65 °C for component A, 70 °C for component B and 65 °C for the hose, at a pressure of at least 130 bar.
The substrate must be between 5 °C and 40 °C and at least 3 °C above the dew point.
Technical datasheet: Rayston Spray D50 TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Rayston Spray D50 technical data (TDS values)
Shore hardness
55D
Elongation at break
500%
Tensile strength
26 MPa
Tear strength
110 N/mm
Technical data
- Hardness (Shore): 55D (ISO 868)
- Elongation at break: 500%
- Tensile strength: 26 MPa (UNE EN ISO 527-1/3)
- Compression modulus: 130 MPa; the membrane does not fail in compression under the test conditions (EN-ISO-604)
- Tear strength: 110 N/mm (ISO 34-1); 400 N (EN-ISO-12310-2)
- Radon diffusion coefficient: 8 × 10⁻¹² m²/s (ISO/DTS 11665-13)
- Methane permeability: 140 Ncm³·mm/(m²·day·bar) (DIN 53380 / ISO 15105-1)
- CO₂ permeability: μ = 50484; Sd > 50 above 1 mm thickness (EN 1062-6:2003)
- Watertight at 100 kPa, 10 m water column (EN 1928) and at 5 bar, 50 m (EN 12390-8)
- Crack-bridging: static A5 at -10 °C; dynamic B4.2 at -20 °C (EN 1062-7)
- Adhesion to concrete: 2.5 MPa
- Dielectric strength: 29.3 kV/mm (IEC EN 60243-1:2013)
Approvals
- CE marking to EN 1504-2 for protection and repair of concrete, certificate 0370-CPR-2247
- CEN/TS 14416:2014 (root-penetration resistance)
- LEED compliant, EQ Credit 4.2
04 · Performance
Rayston Spray D50 performance as a gas barrier
Hardness is 55D (ISO 868), elongation 500%, tensile strength 26 MPa (UNE EN ISO 527-1/3) and tear strength 110 N/mm (ISO 34-1).
The radon diffusion coefficient is 8 × 10⁻¹² m²/s, methane permeability 140 Ncm³·mm/(m²·day·bar), and CO₂ permeability μ = 50484 above 1 mm thickness. The membrane is watertight at 100 kPa (EN 1928) and bridges cracks statically (A5 at -10 °C) and dynamically (B4.2 at -20 °C).
Application data
- Mix ratio: A=1, B=1.13 by weight; A=1, B=1 by volume
- Gel time (A+B, 20 g): 4 s at 25 °C, 3 s at 60 °C
- Recommended temperatures: component A 65 °C, component B 70 °C, hose 65 °C
- Spray pressure: at least 130 bar
- Minimum application rate: 2 kg/m²
- Substrate temperature: 5–40 °C and 3 °C above dew point
- Return to service (25 °C, 50% RH): rain-resistant after 5 min, light foot traffic after 1 h
05 · FAQ
Rayston Spray D50: frequently asked questions
Is Rayston Spray D50 a radon barrier?
Yes. Its radon diffusion coefficient is 8 × 10⁻¹² m²/s (ISO/DTS 11665-13), and it is used on foundations as a barrier against radon, methane and soil contaminants.
What is its compression value?
The datasheet gives a compression modulus of 130 MPa and states that the membrane does not fail in compression under the EN-ISO-604 test conditions.
What is the minimum thickness?
The minimum application rate is 2 kg/m².
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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