SikaCor® HM Mastic
SikaCor® HM Mastic is a solvent-free 2-pack coating based on epoxy resin. Solvent-free according to Protective Coatings Directive of German Paint Industry Association (VdL-RL 04).
- Excellent bonding properties
- Exceptional elevated tightness
- Solvent-free
Usage
Protective coating system for orthotropic steel bridge decks underneath asphalt.Advantages
- Excellent bonding properties
- Exceptional elevated tightness
- Solvent-free
Packaging
| SikaCor® HM Mastic | 25 kg net. |
| SikaCor® HM Primer Plus | 30 kg net. |
| Sikalastic®-827 HT | 25 kg bag |
| Sika® Thinner EG | 25 l, 10 l and 3 l |
| SikaCor® Cleaner | 160 l and 25 l |
Colour
Light grey
Product Details
APPROVALS / CERTIFICATES
- Approved acc. to German Standard 'ZTV-ING, part 7, chapter 4' as reaction resin based high-build bonding layer underneath asphalt on orthotropic steel bridge decks.
Shelf life
2 years
Storage conditions
In originally sealed containers in a cool and dry environment.
Density
| SikaCor® HM Primer Plus | ~1.5 kg/l |
| SikaCor® HM Mastic | ~1.7 kg/l |
| Sikalastic®-827 HT | ~0.75 kg/l |
Solid content
| SikaCor® HM Primer Plus | ~68 % by volume |
| SikaCor® HM Mastic | ~100 % by volume |
| Sikalastic®-827 HT | ~100 % by volume |
Chemical resistance
The described system as well as the single layers are resistant to water, weathering, de-icing salts and petrol.
When exposed to sunlight, the colour of SikaCor® HM Mastic may change to greyish red without any negative effects.
Application
Mixing ratio
| Components A : B |
| Product | By weight |
| SikaCor® HM Primer Plus | 90 : 10 |
| SikaCor® HM Mastic | 75 : 25 |
Material temperature
| SikaCor® HM Primer Plus | min. + 5°C |
| SikaCor® HM Mastic | min. + 10°C |
Relative air humidity
Max. 85 %, except the surface temperature is significantly higher than the dew point temperature, it shall be at least 3 K above dew point.
Surface temperature
Min. + 5°C
Pot Life
| SikaCor® HM Primer Plus | SikaCor® HM Mastic | |
| At + 10°C | ~12 h | ~1.5 h |
| At + 20°C | ~8 h | ~1 h |
| At + 30°C | ~5 h | ~0.5 h |
Waiting time to overcoating
Between primer and bonding layer at 20°C:
min. 1 day / max. 6 days.
Between bonding layer broadcasted with the adhesive layer and asphalt:
min. 1 day / max. 3 weeks.
Prior to further applications possible contamination must be removed.
Consumption
Theoretical material-consumption:
| SikaCor® HM Primer Plus | ~0.176 kg/m2 (at 80 µm) |
| SikaCor® HM Mastic | ~1.7 kg/m2 (at 1000 µm) |
| Sikalastic®-827 HT | ~0.8 - 1.0* kg/m2 |
*Spread evenly, not in excess
SURFACE PREPARATION
Steel:
Blast-cleaning to Sa 2 ½ according to ISO 12944-4.
Free from dirt, oil and grease.
Priming of surface immediately after blast-cleaning.
MIXING
Stir component A very thoroughly using an electric mixer (start slowly, then increase up to approx. 300 rpm). Add component B carefully and mix both components very thoroughly (including sides and bottom of the container). Mix for at least 3 minutes until a homogeneous mixture is achieved. Fill mixed material into clean container and mix again shortly as described above. During mixing and handling of the materials always wear protective goggles, suitable gloves and other protective clothings.
Do not thin SikaCor® HM Mastic!
APPLICATION
SikaCor® HM Primer Plus can be applied by spray, brush or roller (for further information see our product data sheet SikaCor® HM Primer Plus).
Apply SikaCor® HM Mastic uniformly on the cured primer coat with trowel, squeegee, serrated trowel or airless spraying.
Broadcast Sikalastic®-827 HT on the freshly applied, still sticky layer.
Data for airless-spraying:
- Equipment (capacity ≥ 10 l/min)
- Pressure min. 200 bar
- Diameter of hoses min. 10 mm (⅜ inch)
- Nozzle size 0.019 - 0.023 inch (0.48 - 0.58 mm)
- Spraying angle 40° - 60°
- Temperature of material and equipment min. + 25°C
- At low temperatures the use of a flow heater as well as insulation of the hoses is strongly recommended
Do not thin SikaCor® HM Mastic!
After full curing of SikaCor® HM Mastic, remove non-adherent Sikalastic®-827 HT by sweeping with a broom.
CLEANING OF EQUIPMENT
SikaCor® Cleaner