Sikafloor 156

Sikafloor®-156 is a 2-part, low viscosity, multipurpose, epoxy resin which can be used as an epoxy primer, levelling mortar and mortar screed. Internal and external use.

Sikafloor®-156 is a two-part, low-viscosity, solvent-free epoxy resin used as a primer, levelling mortar, bonding bridge, and epoxy screed/mortar binder. It is suitable for both internal and external use and is applied on concrete substrates, cement screeds, and epoxy mortars.

Sikafloor®-156 is a multifunctional material forming part of epoxy flooring systems. It can be combined with quartz sand and Extender T for levelling mortars or screeds. It acts as a primer for other Sika epoxy and polyurethane (PUR) floorings. Key system configurations include:

• Primer: 1–2 coats depending on substrate porosity.
• Levelling Mortar (Fine & Medium): Sikafloor®-156 mixed with quartz sand (0.1–0.3 mm) and Extender T.
• Bonding Bridge: Neat Sikafloor®-156.
• Screed/Repair Mortar: Sikafloor®-156 mixed with graded quartz sands in specified ratios (e.g., 1 pbw resin + 10 pbw sand).

• Primer for absorbent concrete and cementitious substrates.
• Base binder for epoxy floor screeds and mortars.
• Levelling or repair of surfaces with different levels of roughness.
• Base component in systems requiring high bond strength and durability.

• Mix Ratio: Part A : Part B = 75 : 25 by weight.
• Pot Life:
• +10 °C: ~60 min
• +20 °C: ~30 min
• +30 °C: ~15 min
• Curing Time (Non-solvent based overlay):
• +10 °C: 24 hrs min / 4 days max
• +20 °C: 12 hrs min / 2 days max
• +30 °C: 8 hrs min / 24 hrs max
• Foot Traffic:
• +10 °C: ~24 hrs
• +20 °C: ~12 hrs
• +30 °C: ~6 hrs
• Full Cure:
• +10 °C: ~10 days
• +20 °C: ~7 days
• +30 °C: ~5 days
• Installation Conditions:
• Ambient/Substrate Temp: +10 °C to +30 °C
• Relative Humidity: ≤80%
• Dew Point: Substrate must be at least +3 °C above dew point
• Moisture Content: ≤ 4% pbw. Use Sikafloor® EpoCem® TMB if higher.
• Coverage / Thickness:
• Primer: 0.3–0.5 kg/m² per coat
• Levelling Mortar Fine: 1.4 kg/m²/mm
• Levelling Mortar Medium: 1.6 kg/m²/mm
• Epoxy Screed/Repair Mortar: 2.2 kg/m²/mm
• Wet mil thickness not specifically stated but can be inferred from kg/m²/mm values for mortars.
• Tools: Electric stirrers, trowels, squeegees, spiked rollers, power floats, etc.
• Cleaning: Tools must be cleaned with Thinner C immediately after use.

• Sikafloor®-156 is not UV stable; no mention of UV resistance implies it must be overcoated with a suitable UV-stable topcoat if exposed.
• Do not use on substrates with rising moisture.
• Not recommended for areas with constant water exposure unless sealed.
• External applications should be done in falling temperatures to avoid pinholing.
• Perform pre-trials for mortar mix design based on specific aggregate profiles and layer thickness.
• Use only electric heating in low temperatures; avoid fossil fuel heaters to prevent finish defects.

This material is highly versatile and intended for use as a foundational layer in Sika’s flooring systems. It can be integrated into full coating systems where other Sika topcoats (epoxy or PUR) provide finish, UV resistance, or specialized properties.