Sikadur®-31 DW
Sikadur®-31 DW, two part adhesive and repair mortar, based on epoxy resins and special fillers which has been specially formulated to meet the requirements for use in contact with drinking water. Suitable for use in hot and tropical climatic conditions.
- Can be used in drinking water areas
- Easy to mix and apply
- Very good adhesion to most of the construction materials
- Thixotropic: non-sag and suitable for vertical and overhead application
- Hardens without shrinkage
- Different coloured components (for mixing control)
- No primer needed
- High initial and ultimate strengths
Usage
As a structural adhesive for the following substrates:- Concrete
- Hard natural stone
- Ceramics, fibre Cement
- Mortar, Bricks
- Steel, Iron, Aluminium
- Wood
- Polyester, Epoxy
- Glass
- Columns, beams etc.
- Kerbs and edging stones, copings etc.
- Corners and edges
- Hole and void filling
- Joint arrises
- Rigid joint filling
- Crack filling and sealing (non-moving)
Advantages
Sikadur®-31 DW provides the following advantages:- Can be used in drinking water areas
- Easy to mix and apply
- Very good adhesion to most of the construction materials
- Thixotropic: non-sag and suitable for vertical and overhead application
- Hardens without shrinkage
- Different coloured components (for mixing control)
- No primer needed
- High initial and ultimate strengths
Packaging
6 kg (A + B)
Colour
Component A: White Component B: Black Components A + B mixed: Grey
Product Details
APPROVALS / CERTIFICATES
- WRAS, UK: Approval for use with Sikadur-Combiflex SG, approval number 1708503
- Sikadur®-31 DW follows the requirements of EN 1504-4 as adhesive for structural bonding
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, heat and moisture.
Density
| 2.00 kg/l (component A + B mixed) (+20 °C) |
System Structure
Please consult the Sikadur®-Combiflex® System product data sheet for all applications with this system.
Compressive Strength
| Curing time | Curing temperature 23 °C |
| 14 d | ~78 N/mm2 |
Tensile Strength in Flexure
| Curing time | Curing temperature 23 °C |
| 14 d | ~37 N/mm2 |
Tensile Strength
| Curing time | Curing temperature 23 °C |
| 14 d | ~23 N/mm2 |
Tensile Adhesion Strength
| Curing time | Substrate | Curing temperature | Adhesion strength |
| 7 d | Concrete dry | +23 °C | 3 N/mm2 * |
| 7 d | Concrete moist | +23 °C | 2 N/mm2 * |
| 7 d | Steel sandblasted | +23 °C | 9 N/mm2 |
*100 % concrete failure
Shrinkage
Hardens without shrinkage.
Coefficient of Thermal Expansion
| 2.36 x 10−5 per °C (Temperature range +23 °C - +60 °C) | (EN 1770) |
Heat Deflection Temperature
| Curing time | Curing temperature | HDT |
| 7 d | +23 °C | +50 °C |
Application
Mixing Ratio
Component A : Component B = 3 : 1 by weight or volume
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 10 mm thickness. | (EN 1799) |
Product Temperature
Sikadur®-31 DW must be at a temperatures of between +10 °C and +30 °C for application.
Ambient Air Temperature
+10 °C min. / +30 °C max.
Dew Point
Beware of condensation.Substrate temperature during application must be at least 3 °C above dew point.
Substrate Temperature
+10 °C min. / +30 °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 |
| +23 °C | ~90 min | - |
| +30 °C | - | ~55 min |
*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).
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 blast cleaning 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 (maximum 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 approximately 1 more minute at low speed to keep air entrapment at a minimum. Mix only that quantity which can be used within its potlife.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Sika® Colma Cleaner immediately after use. Hardened / cured material can only be mechanically removed.