Polyurea H SL: Slow-Reacting Polyurea Flooring Resin for Hot Spray
Polyurea H SL is a two-component, slow-reacting polyurea flooring resin, hot-sprayed to create seamless floor membranes, with or without broadcast aggregate.
- Product: Polyurea H SL
- Application: hot-spray flooring
- Mix: A=1 : B=1.12 by weight / 1:1 by volume
- Gel time: 1.5 min at 25 °C
- Colours: light grey, dark grey, rust red, blue
Always supplied with the chosen pigment, which helps achieve a uniform appearance; application without pigment is not recommended.
01 · Uses
Uses of a slow-reacting polyurea flooring resin
- General fast-track flooring systems.
- Decorative and industrial floors that need quick execution.
- Seamless floor membranes, with or without broadcast aggregate.
Choosing a floor system? See resin floor classes by traffic and the industrial flooring application page.
02 · Application
Application of Polyurea H SL
Polyurea H SL is applied with hot plural-component spray equipment. Concrete is prepared mechanically by shot blasting, scarifying or diamond grinding to open the pores, then primed and repaired to a regular surface; sharp irregularities are ground off and dust removed by vacuum.
The substrate must be flat and cohesive, with a pull-off strength of at least 1.4 N/mm², free of cracks, clean and dry. Add the pigment to component A and stir at low speed for a few minutes – overmixing increases moisture uptake.
To broadcast sand or aggregate on the top coat, wait until viscosity rises (about 1 min); the surface stays receptive for 4–10 minutes after spraying. The required thickness is usually reached in one coat.
Technical datasheet: Polyurea H SL TDS (PDF) · Polyurea waterproofing systems
03 · Technical data
Polyurea H SL technical data (TDS values)
Shore hardness
95A/55D
Elongation at break
160%
Tensile strength
13 MPa
Tear strength
78 N/mm
Technical data
- Hardness (Shore): 95A/55D (ISO 868)
- Elongation at break: 160%
- Tensile strength: 13 MPa (EN-ISO 527-3)
- Tear strength: 78 N/mm (ISO 34-1, method B)
- Adhesion: 5.6 MPa on concrete (EP 100 primer); 3.6 MPa on steel (PU primer)
- Abrasion: 40 mg (Taber, CS10, 1 kg, 1000 cycles)
- Chemical resistance (24 h surface contact at room temperature; 5 best, 0 worst): water 5; sodium hydroxide 20%, 33% and 50%: 5; glycerine (50% in water) 5; sulphuric acid 10%: 5; ammonia 3%: 4; isopropyl alcohol 3; xylene 0
04 · Performance
Polyurea H SL performance
It cures to a hard membrane of 95A/55D, with Taber abrasion of 40 mg (CS10, 1 kg, 1000 cycles). As an aromatic polyurea it changes colour in sunlight; additional UV protection comes from a fast-curing aliphatic topcoat.
With quartz sand broadcast, it is walkable 2–4 hours after application; under usual conditions (25 °C, 50% RH) the broadcast membrane takes light foot traffic after 2 hours.
Application data
- Mix ratio: A=1, B=1.12 by weight; A=1, B=1 by volume
- Gel time (A+B, 20 g): 1.5 min at 25 °C, 1 min at 60 °C
- Recommended temperatures: component A 60 °C, component B 60 °C, hose 59 °C
- Pressure: 140–150 bar
- Spray rate: 2–3 kg/m² (reference)
- Broadcasting: after about 1 min; surface open for 4–10 min after spraying
- Air temperature: 10–40 °C, relative humidity below 85%
- Storage: 10–30 °C, dry; use within 12 months of manufacture in the sealed container
05 · FAQ
Polyurea H SL: frequently asked questions
Why a slow-reacting polyurea for floors?
A 1.5-minute gel time at 25 °C lets the resin level out and leaves a 4–10 minute window to broadcast sand or aggregate.
Can Polyurea H SL be used without pigment?
It is not recommended; it is always supplied with the chosen pigment to give a uniform appearance.
When can people walk on it?
With quartz sand broadcast, after 2–4 hours; at 25 °C and 50% RH light foot traffic is possible after 2 hours.
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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