Sikadur®-31 DW
Sikadur®-31 DW is a 2-part epoxy based moisture tolerant, thixotropic, structural adhesive which bonds most construction materials. It has high mechanical strengths and can also be used for minor concrete repairs, joint filling and crack sealing. Temperature range +10 °C to +30 °C. Internal and external use. It has been specially formulated to meet the requirements for use in contact with drinking water.
- Can be used in drinking water areas
- Easy to mix and apply
- Very good adhesion to most construction materials
- High mechanical strengths
- 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 most liquids and water vapour
- Good chemical resistance
Usage
Structural adhesive for bonding:- Concrete elements
- Hard natural stone
- Ceramics, fibre cement
- Mortar, Bricks, Masonry
- Steel, Iron, Aluminium
- Wood
- Polyester, Epoxy
- Glass
- Sikadur®-Combiflex® System for drinking water applications
- Corners and edges
- Holes and void filling
- Metal profiles
- Bonding slip bricks
- Joint and crack arris / edge repair
- Sealing non-structural static cracks
Advantages
- Can be used in drinking water areas
- Easy to mix and apply
- Very good adhesion to most construction materials
- High mechanical strengths
- 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 most liquids and water vapour
- Good chemical resistance
Packaging
| Parts A+B: 6 kg | Pre-batched unit |
| Pallets of 90 units |
Colour
| Part A | White |
| Part B | Dark grey |
| Part A+B mixed | Concrete grey |
Product Details
APPROVALS / STANDARDS
- CE Marking and Declaration of Performance to EN 1504-4 - Structural bonding
- Adhesive for Waterproofing System ÖNORM B 5014 Test 1, Sikadur®-31 DW, OFI Technologie & Innovation GmbH, Test Report No. 408.394
- Migration Analysis RD 118/2003, Sikadur®-31 DW, O.T.E.C., Test report No. 0761415488
- Water Regulations Approval BS6920-1, Sikadur®-31 DW, WRAS, Approval No. 1708503
Chemical Base
Epoxy resin and selected fillers
Shelf Life
24 months from date of production
Storage Conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.
Density
Mixed resin: ~2,00 ±0,1 kg/l
Density value at +20 °C
Product Declaration
EN 1504-4: Structural bonding
System Structure
Refer to the Sikadur®-Combiflex® System product data sheet for all applications with this system.
Compressive Strength
| Curing time | Curing temperature 23 °C |
| 14 days | ~78 N/mm2 |
Flexural Strength
| Curing time | Curing temperature 23 °C |
| 14 days | ~37 N/mm2 |
Tensile Strength
| Curing time | Curing temperature 23 °C |
| 14 days | ~23 N/mm2 |
Tensile Adhesion Strength
| Curing time | Substrate | Curing temperature | Adhesion strength |
| 7 days | Concrete dry | +23 °C | 3 N/mm2 * |
| 7 days | Concrete moist | +23 °C | 2 N/mm2 * |
| 7 days | Steel sandblasted | +23 °C | 9 N/mm2 |
*100 % concrete failure
Shrinkage
Hardens without shrinkage.
Coefficient of Thermal Expansion
| ~2,36 × 10-5 (±0,2 × 10-5) 1/K | (EN 1770) |
(linear expansion between +23 °C and +60 °C)
Chemical Resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information.
Heat Deflection Temperature
| Curing time | Curing temperature | HDT |
| 7 days | +23 °C | +50 °C |
Application
Mixing Ratio
Part A : Part B = 3 : 1 by weight or volume
Layer Thickness
30 mm max.
For non- structural adhesive or other applications, if layer thickness’s of >30 mm are required, apply in successive 30 mm layers or once the previous layer has hardened. The surface of the freshly applied intermediate layers should be scratched to form a key for subsequent layers. If layer application is to be longer than 2 days, the wet applied adhesive must be blinded to excess with quartz sand immediately after application.
Sag Flow
| Non-sag up to 10 mm thickness on vertical surfaces | (EN 1799) |
Product Temperature
+10 °C min. / +30 °C max.
Ambient Air Temperature
+10 °C min. / +30 °C max.
Dew Point
Beware of condensation.
Steel substrate temperature during application must be at least +3 °C above dew point.
Substrate Temperature
+10 °C min. / +30 °C max.
Substrate Moisture Content
Cementitious substrates must be dry or matt damp (no standing water).
Brush the adhesive well into the substrate if matt damp.
Pot Life
| Temperature | Potlife* | Open time |
| +23 °C | ~105 minutes | — |
| +30 °C | — | ~45 minutes |
*200 g
Potlife begins when parts A+B 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 smaller quantities. Another method is to chill parts A+B before mixing (not below +5 °C).
Waiting Time / Overcoating
Sikadur®-31 DW may be overcoated with a Sika® compatible epoxy coating when adhesive has hardened
SUBSTRATE QUALITY
Concrete / masonry / mortar / stone
Concrete and mortar must be at least 3–6 weeks old.
Substrate surfaces must be sound, clean, dry or matt damp. Free from standing water, ice, dirt, oil, grease, coatings, laitance, efflorescence, old surface treatments, all loose particles and any other surface contaminants that could affect adhesion of the adhesive.
Steel
Surfaces must be clean, dry, free from oil, grease, coatings, rust, scale, all loose particles and any other surface contaminants that could affect adhesion of the adhesive.
Wood
Substrate surfaces must be sound, clean, dry and free from dirt, oil, grease, coatings, all loose particles and any other surface contaminants that could affect adhesion of the adhesive.
SUBSTRATE PREPARATION
Concrete / masonry / mortar / stone
Substrates must be prepared mechanically using suitable abrasive blast cleaning, needle gunning, light scabbling, bush hammering, grinding or other suitable equipment to achieve an open textured gripping surface profile.
Steel
Surfaces must be prepared mechanically using suitable abrasive blast cleaning, grinding, rotating wire brush or other suitable equipment to achieve a bright metal finish with a surface profile to satisfy the necessary tensile adhesion strength requirement. Avoid dew point conditions before and during application.
Wood
Surfaces must be prepared by planing, sanding or other suitable equipment.
All substrates
All dust and loose material must be completely removed from all substrate surfaces before application of the product by vacuum / dust removal equipment.
MIXING
Pre-batched units
Prior to mixing all parts, mix part A (resin) briefly using a mixing spindle attached to a slow speed electric drill (max. 300 rpm). Add part B (hardener) to part A and mix parts A+B continuously for at least 3 minutes until a uniformly coloured smooth consistency mix has been achieved. To ensure thorough mixing pour materials into a clean container and mix again for approximately 1 minute. Over mixing must be avoided to minimise air entrainment. Mix full units only. Mixing time for A+B = 4,0 minutes. Mix only the quantity which can be used within its pot life.
CLEANING OF TOOLS
Clean all tools and application equipment with Sika® Colma Cleaner immediately after use. Hardened material can only be mechanically removed.