Product Data Sheet Show all documents
Sikadur®-31 DW Rapid

Sikadur®-31 DW Rapid

2-component epoxy adhesive tested for drinking water contact

Sikadur®-31 DW Rapid is a solvent-free, thixotropic, 2-component 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.

Sikadur®-31 DW Rapid provides the following advantages:
  • Can be used in drinking water installations as part of the Sikadur Combiflex® SG system
  • Easy to mix and apply
  • Very good adhesion to most of the construction materials
  • Thixotropic: Non-sag and suitable for vertical and overhead application
  • Solvent-free
  • Hardens without shrinkage
  • Different coloured components (for mixing control)
  • No primer needed
  • High initial and ultimate strengths
  • Good abrasion resistance
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Product Data Sheet Show all documents

Usage

As a structural adhesive for the following substrates:
  • Concrete
  • Hard natural stone
  • Mortar, Bricks
  • Steel
  • As adhesive for use with Sikadur® Combiflex SG
As a structural adhesive for precast concrete segments including:
  • Columns, beams etc.
  • Kerbs and edging stones, copings etc.
Rapid curing concrete repairs:
  • Corners and edges
  • Hole and void filling
  • Joint arrises
Joint filling and crack sealing:
  • Rigid joint filling
  • Crack filling and sealing (non-moving)
 

Advantages

Sikadur®-31 DW Rapid provides the following advantages:
  • Can be used in drinking water installations as part of the Sikadur Combiflex® SG system
  • Easy to mix and apply
  • Very good adhesion to most of the construction materials
  • Thixotropic: Non-sag and suitable for vertical and overhead application
  • Solvent-free
  • Hardens without shrinkage
  • Different coloured components (for mixing control)
  • No primer needed
  • High initial and ultimate strengths
  • Good abrasion resistance

Packaging

6 kg (A+B)Prebatched unit

Colour

Component A: white
Component B: black
Component A+B mixed: grey

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • Compliance with Regulation 31(4) a of the UK Water Supply (Water Quality) Regulations, when used as part of a system with Sikadur® SG Combiflex
  • Testing according to EN 1504-4
  • All raw materials are on European synoptic list for drinking water applications
Product Information

Chemical Base

Epoxy resin

Shelf Life

18 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

1.95 kg/l (part A+B mixed) (at +20 °C)
System information

System Structure

Consult the Sikadur®-Combiflex® System product data sheet for all applications with this system.

 
Technical Information

Compressive Strength

Curing timeCuring temperature
+5 °C+20 °C
1 day—~ 28 N/mm2
3 days~ 23 N/mm2~ 33 N/mm2
7 days~ 38 N/mm2~ 38 N/mm2
14 days~ 43 N/mm2~ 43 N/mm2

Modulus of Elasticity in Compression

~ 5400 N/mm2 (14 days at +5 °C)(ASTM D 695)
~ 6400 N/mm2 (14 days at +20 °C)(ASTM D 695)

Flexural Strength

Curing timeCuring temperature
+5 °C+20 °C
1 day~ 11 N/mm2

~ 11 N/mm2

3 days

~ 23 N/mm2~ 25 N/mm2
7 days~ 27 N/mm2~ 29 N/mm2
14 days~ 27 N/mm2~ 32 N/mm2

Tensile Strength

Curing timeCuring temperature
+5 °C+20 °C
1 day~ 8 N/mm2~ 8 N/mm2
3 days~ 16 N/mm2~ 16 N/mm2
7 days~ 19 N/mm2~ 20 N/mm2
14 days~ 21 N/mm2~ 22 N/mm2

Tensile Adhesion Strength

Curing timeSubstrateCuring temperature

Adhesion strength

7 days

Concrete dry

+5 °C

~ 4 N/mm2 *

7 days

Concrete moist

+5 °C

~ 2.8 N/mm2 *

7 daysSteel sandblasted+5 °C~ 13.8 N/mm2

*  concrete failure

Shrinkage

Hardens without shrinkage

Coefficient of Thermal Expansion

W = 2.11 x 10−5 per °C (Temp. range +23 °C − +60 °C)

(EN 1770)

Glass Transition Temperature

50 °C (7 days at +20 °C)

(EN 12614)

Heat Deflection Temperature

Curing time

Curing temperature

HDT

7 days+20 °C+49 °C

Application

Application Information

Mixing Ratio

Component A : component B = 3 : 1 by weight or volume

Layer Thickness

30 mm max per layer. Multiple layers can be used to achieve required final thickness.Wait for each previous layer to harden & cool before applying next layer.

Sag Flow

On vertical surfaces it is non-sag up to 10 mm thick.

(EN 1799)

Product Temperature

Sikadur®-31 DW Rapid must be at a temperatures of between +5 °C and +20 °C for application.

Ambient Air Temperature

+5 °C min. / +20 °C max.

Dew Point

Beware of condensation.
Substrate temperature during application must be at least 3 °C above dew point.

Substrate Temperature

+5 °C min. / +20 °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**

+5 °C

~ 90 minutes

—

+20 °C

~ 40 minutes

~ 50 minutes

*120 g

**EN 12189

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).
Application steps

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, 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

Mix components A+B together for at least 3 minutes with a mixing spindle attached to a slow speed electric drill (max. 600 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 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.

CLEANING OF TOOLS

Clean all tools and application equipment with Sika® Thinner C immediately after use. Hardened / cured material can only be removed mechanically.

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