Sikafloor® PurCem® HM-20
Sikafloor® PurCem® HM-20 is made with polyurethane cement technology and is part of the Sikafloor® PurCem® flooring range. Sikafloor® PurCem® HM-20 is a trowel applied coloured modified polyurethane mortar screed resin suitable for floors subject to temperature shocks and heavy loading, abrasion and chemical exposure.
It has a textured aggregate surface providing medium to heavy profile slip resistance and is typically installed at 6 to 9 mm thick.
- High chemical resistance. Resists a wide range of organic and inorganic acids, alkalis, amines, salts and solvents
- Good resistance to high temperature changes
- Steam cleanable at 9 mm thick
- High mechanical and abrasion resistance
- Easy application. Normally, no concrete primer or sealer required
- Fluid consistency requires less labour to install than conventional heavy duty modified PU trowel grade screeds
- Easy to clean and maintain
- Seamless, non-taint, odourless
- Smooth, matt surface
- Tolerant to moisture in the substrate
- Very good life cycle cost performance
Usage
- Food processing plants, in wet or dry process areas, freezers and coolers, thermal shock areas
- Chemical plants
- Laboratories
- Workshops
Advantages
- High chemical resistance. Resists a wide range of organic and inorganic acids, alkalis, amines, salts and solvents
- Good resistance to high temperature changes
- Steam cleanable at 9 mm thick
- High mechanical and abrasion resistance
- Easy application. Normally, no concrete primer or sealer required
- Fluid consistency requires less labour to install than conventional heavy duty modified PU trowel grade screeds
- Easy to clean and maintain
- Seamless, non-taint, odourless
- Smooth, matt surface
- Tolerant to moisture in the substrate
- Very good life cycle cost performance
Packaging
Please refer to the individual Product Data Sheet
Colour
Red, Green, Cream, Yellow, Grey, and Light Grey
Appearance
Textured surface, matt finish
System Details
Shelf Life
Please refer to the individual Product Data Sheet
Storage Conditions
Please refer to the individual Product Data Sheet
System Structure
Sikafloor® PurCem® HM-20
| Layer | Product |
| 1. Scratch coat + Lightly broadcast with Quartz Sand (0.3–0.9 mm) | Sikafloor®-21 PurCem® LP Sikadur®-501 |
| 2. Body coat | Sikafloor®-20 PurCem® LP |
Composition
Water-based polyurethane cement hybrid
Nominal Thickness
~ 6–9 mm
Shore D Hardness
| 80–85 | (ASTM D 2240) |
Compressive Strength
| 28 days | ~50 N/mm² |
Tensile Strength
| 28 days | ~4.3 N/mm² |
Tensile Strength in Flexure
| 28 days | ~9.5 N/mm² (3 mm) |
Tensile Adhesion Strength
| >1.5 N/mm² (failure in concrete) | (EN1542) |
Reaction to Fire
| Class Bfl-S1 | (EN 13501-1) |
Chemical Resistance
Please refer to Sikafloor® PurCem® chemical resistance guide. Contact Sika technical service for specific information.
Temperature Resistance
| 6 mm | 9 mm |
| -25 °C to +80 °C | -40 °C to +120 °C |
Sikafloor® PurCem® HM-20 is fully resistant to liquid spillage and discharge. Sikafloor® PurCem® HM-20 is designed to withstand thermal shock caused by steam cleaning when thickness is 9 mm.
Permeability to Water Vapour
| 0.148 g/h/m2 (6.1 mm) | (ASTM E-96) |
Skid / Slip Resistance
| SRV Dry | SRV Wet |
| 70 | 65 |
Application
Product Temperature
Please refer to the individual Product Data Sheet
Ambient Air Temperature
+10 °C min / +30 °C max
Relative Air Humidity
80 % max
Dew Point
Beware of condensation!
The substrate and uncured floor must be at least 3 °C above dew point to reduce the risk of condensation or other disturbance of the surface on the floor finish.
Substrate Temperature
+10 °C min / +30 °C max
Substrate Moisture Content
Sikafloor® PurCem® HM-20 can be installed on substrates with higher moisture content. The substrate needs to be visibly dry and have an adequate pull-off strength min 1.5 N/mm2. No ponding water. Check for rising moisture.
Applied Product Ready for Use
| Temperature | Foot traffic | Light traffic | Full cure |
| +10 °C | ~24 hours | ~48 hours | ~7 days |
| +20 °C | ~24 hours | ~24 hours | ~5 days |
| +30 °C | ~12 hours | ~18 hours | ~3–4 days |
| +35 °C | ~12 hours | ~18 hours | ~3–4 days |
Note: Times are approximate and will be affected by changing ambient conditions and substrate conditions
Consumption
| Layer | Product | Consumption |
| 1. Scratch coat + Lightly broadcast with Quartz Sand (0.3–0.9 mm) | Sikafloor®-21 PurCem® Sikadur®-501 | ~1.5–2.0 kg/m² ~2.0–2.5 kg/m² |
| 2. Body coat | Sikafloor®-20 PurCem® | ~2.0 kg/m²/mm |
Consumptions are theoretical and do not include any wastage, additional material need due to porosity, substrate profile etc.
CLEANING
Please refer to Sikafloor®- Cleaning Regime.