Sikadur®-31 CF Slow
Sikadur®-31 CF Slow is a moisture tolerant, thixotropic, structural 2-component adhesive and repair mortar, based on epoxy resins and special fillers for use at higher temperatures between +25 °C and +45 °C.
- Easy to mix and apply
- Very good adhesion to most construction materials
- High strength adhesive
- Thixotropic: non-sag in vertical and overhead applications
- Hardens without shrinkage
- Different coloured components (for mixing control)
- No primer needed
- High initial and ultimate mechanical strength
- Good abrasion resistance
- Impermeable to liquids and water vapour
- Good chemical resistance
Usage
Sikadur®-31 CF Slow may only be used by experienced professionals. As a structural adhesive and mortar for:- Concrete elements
- Hard natural stone
- Ceramics, fibre cement
- Mortar, Bricks, Masonry
- Steel, Iron, Aluminium
- Wood
- Polyester, Epoxy
- Glass
- Corners and edges
- Holes and void filling
- For vertical and overhead use
- Joint arris repair and crack sealing
Advantages
Sikadur®-31 CF Slow has the following advantages:- Easy to mix and apply
- Very good adhesion to most construction materials
- High strength adhesive
- Thixotropic: non-sag in vertical and overhead applications
- Hardens without shrinkage
- Different coloured components (for mixing control)
- No primer needed
- High initial and ultimate mechanical strength
- Good abrasion resistance
- Impermeable to liquids and water vapour
- Good chemical resistance
Packaging
| 6 kg (A+B) | Pre-batched unit |
| pallets of 480 kg (80 x 6 kg) | |
| 1.2 kg (A+B) | Pre-batched unit |
| box of 6 x 1.2 kg |
Colour
Component A: grey
Component B: black
Components A+B mixed: concrete grey
Product Details
APPROVALS / CERTIFICATES
- Adhesive for structural bonding tested according to EN 1504-4, provided with the CE-mark
Composition
Epoxy resin
Shelf life
24 months from date of production
Storage conditions
Store in original, unopened, sealed and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Protect from direct sunlight.
Density
| 1.93 ± 0.1 kg/l (component A+B mixed) (at +23 °C) (evacuated) |
Compressive strength
| Curing time | Curing temperature | ||
+25 °C | +35 °C | +45 °C | |
| 1 day | ~30 N/mm2 | ~45 N/mm2 | ~48 N/mm2 |
| 3 days | ~47 N/mm2 | ~49 N/mm2 | ~54 N/mm2 |
| 7 days | ~52 N/mm2 | ~54 N/mm2 | ~57 N/mm2 |
Modulus of elasticity in compression
| ~ 2,600 N/mm2 (14 days at +23 °C) | (ASTM D 695) |
Tensile strength in flexure
| Curing time | Curing temperature | ||
+25 °C | +35 °C | +45 °C | |
| 1 day | ~20 N/mm2 | ~20 N/mm2 | ~20 N/mm2 |
| 3 days | ~25 N/mm2 | ~25 N/mm2 | ~25 N/mm2 |
| 7 days | ~27 N/mm2 | ~27 N/mm2 | ~28 N/mm2 |
Tensile strength
| Curing time | Curing temperature | ||
+25 °C | +35 °C | +45 °C | |
| 1 day | ~6 N/mm2 | ~12 N/mm2 | ~13 N/mm2 |
| 3 days | ~12 N/mm2 | ~13 N/mm2 | ~16 N/mm2 |
| 7 days | ~13 N/mm2 | ~13 N/mm2 | ~17 N/mm2 |
Tensile adhesion strength
| Curing time | Substrate | Curing temperature | Adhesion strength |
7 days | Concrete dry | +35 °C | > 4 N/mm2 * |
7 days | Concrete moist | +25 °C | > 4 N/mm2 * |
| 7 days | Concrete moist | +35 °C | > 4 N/mm2 * |
| 7 days | Steel | +25 °C | ~15 N/mm2 |
| 7 days | Steel | +35 °C | ~14 N/mm2 |
| 7 days | Steel | +50 °C | ~14 N/mm2 |
*100% concrete failure
Shrinkage
Hardens without shrinkage.
Coefficient of thermal expansion
| 7.9 x 10−5 per °C (Temp. range +23 °C − +60 °C) | (EN 1770) |
Heat deflection temperature
Curing time | Curing temperature | HDT |
| 7 days | +35 °C | +50 °C |
(thickness 10 mm)
Application
Mixing ratio
Component A : component B = 2 : 1 by weight
Layer thickness
30 mm max.
When using multiple units, one after the other. Do not mix the following unit until the previous one has been used in order to avoid a reduction in handling time.
Sag flow
| On vertical surfaces it is non-sag up to 15 mm thickness. | (EN 1799) |
Product temperature
Sikadur®-31 CF Slow can be applied at temperatures between +25 °C and +45 °C.
Ambient air temperature
+25 °C min. / +45 °C max.
Dew point
Beware of condensation.
Substrate temperature during application must be at least 3 °C above dew point.
Substrate temperature
+25 °C min. / +45 °C max.
Substrate moisture content
Substrate must be dry or mat damp (no standing water)
Brush the adhesive well into the substrate
Pot Life
Temperature | Potlife* | Open time |
+25 °C | ~ 120 minutes | — |
+35 °C | ~ 70 minutes | — |
| +45 °C | ~ 45 minutes | ~ 60 minutes |
*200 g
The potlife begins when the resin and hardener are mixed. It is shorter at high temperatures and longer at low temperatures. The greater the quantity mixed, the shorter the potlife. To obtain longer workability at high temperatures, the mixed adhesive may be divided into portions. Another method is to chill components A+B before mixing them (not below +5 °C).
Consumption
~ 1.9 kg/m2 per mm of thickness.
SUBSTRATE QUALITY
Mortar and concrete must be older than 28 days. (depends on minimal requirement of strengths).
Verify the substrate strength (concrete, masonry, natural stone).
The 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
The substrate must be sound and all loose particles must be removed.
SUBSTRATE PREPARATION
Concrete, mortar, stone, bricks: Substrates must be sound, dry or mat damp (no standing water), clean and free from laitance, ice, standing water, 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.
Steel: Must be cleaned and prepared thoroughly to an acceptable quality i.e. by blastcleaning and vacuum. Avoid dew point conditions.
MIXING
Pre-batched units:
Mix components A+B together for at least 3 minutes with a mixing spindle attached to a slow speed electric drill (max. 300 rpm) until the material becomes smooth in consistency and a uniform grey colour. Avoid aeration while mixing. Then, pour the whole mix into a clean container and stir again for ~ 1 minute at low speed to keep air entrapment at a minimum. Mix only that quantity which can be used within its pot life.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Sika® Colma Cleaner immediately after use. Hardened / cured material can only be mechanically removed.