Rayston Floor D40 FR: Seamless Hot-Spray Polyurea Floor Coating
Rayston Floor D40 FR is a hot-spray polyurea floor coating applied by machine, totally free of solvents and mineral fillers. Once cured it forms a fully continuous coating with no joints or overlaps: mechanically tough, weather-resistant, thermoset and flexible enough to bridge possible cracks in the substrate.
- Product: Rayston Floor D40 FR
- Application: hot-spray flooring
- Mix: A=1 : B=1.05 by weight / 1:1 by volume
- Gel time: 8–9 s at 25 °C
- Colours: light grey, dark grey, rust red, blue
The membrane cures in seconds and the floor is back in use within a few hours.
01 · Uses
Uses of a hot-spray polyurea floor coating
- Coating of concrete or steel floors, always with a suitable primer.
- Protection of concrete floor structures, especially those exposed outdoors.
Compare floor systems in resin floor classes by traffic or read about the fire-rated sister product, Rayston Floor D50 FR.
02 · Application
Application of Rayston Floor D40 FR
Rayston Floor D40 FR is applied only with spray equipment suitable for hot two-component systems. Concrete is prepared mechanically by abrasive blasting or scarifying to remove laitance and open the pores, then primed and levelled to a regular surface; sharp irregularities are removed with a grinder, and dust by brush, broom or vacuum.
The substrate must be flat and cohesive with a pull-off strength of at least 1.5 N/mm², moisture below 4%, ambient humidity below 85% and a temperature between 10 °C and 40 °C; above 45 °C, extra measures apply per the manufacturer. If residual moisture is suspected, consult the technical department to avoid surface blistering – see also pinholes and blisters.
Over an epoxy primer, spray only once the primer is dry (about 8 hours). The required thickness is usually reached in one coat; if a second pass is needed, apply it immediately after the first.
Technical datasheet: Rayston Floor D40 FR TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Rayston Floor D40 FR technical data (TDS values)
Shore hardness
90A/40D
Max. elongation
400%
Max. tensile strength
10 MPa
Abrasion (Taber, CS17)
25 mg
Technical data
- Hardness (Shore): 90A/40D (ISO 868)
- Max. elongation: 400%
- Max. tensile strength: 10 MPa (EN-ISO 527-3)
- Abrasion: 25 mg (Taber, CS17, 1000 cycles, 1 kg)
- Adhesion: 5.6 MPa on concrete (EP100 primer); 3.6 MPa on steel (PU Activator primer)
- Chemical resistance, immersion/continuous contact (0 worst, 5 best): distilled water 15 days at 80 °C: 5; salt water 5 days at 80 °C: 5; diesel 16 days at 80 °C: 5; sodium hydroxide (40 g/l) 7 d at 80 °C: 5; ammonia 7 d at 80 °C: 5
- Sulphuric acid (10%) 7 d at 80 °C: 4; bleach 7 d at 80 °C: 4; hydrogen peroxide (33%) 7 d at 25 °C: 4; sulfamic acid (8.5%) 7 d at 60 °C: 4
- Xylene 7 d at 80 °C: 1; ethyl acetate, isopropyl alcohol and concentrated HCl 7 d at 80 °C: 0
Approvals
- Fire classification: Bfl-s1
04 · Performance
Rayston Floor D40 FR performance
Hardness is 90A/40D, maximum elongation 400% and Taber abrasion about 25 mg (CS17, 1000 c, 1 kg), with a Bfl-s1 fire classification.
Aromatic polyurea changes colour in sunlight without losing mechanical properties, so an aliphatic topcoat is recommended where appearance matters outdoors. Under normal conditions (25 °C, 50–60% RH) the coating resists rain within 15 minutes and takes light foot traffic within 1 hour.
Application data
- Mix ratio: A=1, B=1.05 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
- Recirculation before heating: 25–30 °C (40 °C max.)
- Recommended temperatures: component A 65 °C, component B 70 °C, hose 65 °C
- Pressure: about 135–170 bar
- Reference application rate: 2–2.5 kg/m²
- Wind: above 25 km/h affects reaction speed, mixing efficiency and surface texture
- Shore A/D build-up (2 mm, 15–20 °C, 50–60% RH): 74/27 after 10 min, 77/29 after 20 min, 80/30 after 1 h, 88/35 after 24 h
- Storage: 10–30 °C, dry; shelf life 12 months from manufacture
05 · FAQ
Rayston Floor D40 FR: frequently asked questions
Is Rayston Floor D40 FR fire-rated?
Yes, it carries a Bfl-s1 fire classification.
Which primer do I need?
Always a suitable primer: the datasheet gives adhesion of 5.6 MPa on concrete with EP100 primer and 3.6 MPa on steel with PU Activator.
How quickly can the floor be used?
At 25 °C and 50–60% RH it resists rain within 15 minutes and light foot traffic within 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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