Sika Sikadur 31 EF

SKU id21628 Non Hazardous
A moisture tolerant, thixotropic, structural 2 component multi-purpose adhesive.
Available in 8 x 1.2 Kg Packs and 6 Kg in Concrete Grey
£95.00 (£114.00 Inc VAT)
£95.00 (£114.00 Inc VAT)

Product Description

Sika Sikadur 31 EF is a moisture tolerant, thixotropic, structural 2 component multi-purpose adhesive, based on a combination of epoxy resins and special fillers, designed for use at temperatures between +10 °C and +30 °C.

Best Uses

Sika Sikadur 31 EF is formulated as a structural adhesive for concrete elements, hard natural stone, ceramics, fibre cement, mortar, bricks, masonry, steel, iron, wood, polyester, and epoxies. Sika Sikadur 31 EF is a repair material and adhesive for use on corners and edges, holes and void filling, vertical and overhead use, joint filling and crack sealing and joint and crack arris / edge repair.

Sika Sikadur 31 EF has the following advantages:

  • Easy to mix and apply
  • Good adhesion to most construction materials
  • Thixotropic: non-sag in vertical and overhead applications
  • Hardens without shrinkage
  • Different coloured components (for mixing control)
  • No primer needed
  • Abrasion resistant
  • Impermeable to liquids and water vapour
  • Chemical resistant


Mortar and concrete must be older than 28 days (depends on minimum strength requirements). Verify the substrate strength (concrete, masonry, natural stone). Substrate surface (all types) must be clean, dry or mat damp (no standing water) and free from contaminants such as dirt, oil, grease, existing surface treatments and coatings etc. Steel substrates must be de-rusted similar to Sa 2.5. Substrate must be sound and all loose particles must be removed.

Preparation of concrete, mortar, stone, bricks: Substrates must be sound, dry or mat damp (no standing water), clean and free from laitance, ice, grease, oils, old surface treatments or coatings and all loose or friable particles must be removed to achieve a laitance and contaminant free, open textured surface.

Preparation of Steel
Must be cleaned and prepared thoroughly to an acceptable quality i.e. by blast cleaning and vacuum. Avoid dew point conditions.

Mix components A+B together for at least 3 minutes with a mixing spindle attached to a slow speed electric drill (approx. 300 rpm) until the material becomes smooth in consistency and a uniform grey colour. Avoid aeration while mixing. Pour the whole mix into a clean container and stir again for approx. 1 more minute at low speed to keep air entrapment at a minimum. Mix only that quantity which can be used within its pot life.

When using a thin layer adhesive, apply the mixed adhesive to the prepared surface with a spatula, trowel, notched trowel, (or with hands protected by gloves). When applying as a repair material, use some form work. When using for bonding metal profiles onto vertical surfaces ,support and press uniformly using props for at least 12 hours, depending on the thickness applied (not more than 5 mm) and the room temperature.

Once hardened check the adhesion by tapping with a hammer.