Sikadur 31 EF Grey Construction Adhesive 1.2 kg

Sikadur 31 EF is a two-component structural adhesive and repair mortar based on epoxy resins and special fillers, it is thixotropic and moisture tolerant. It is designed to be used in temperatures between +10º and +30ºC.

• Easy to mix and apply.
• Good adhesion to most building materials.
• Thixotropic, does not sag in applications on vertical surfaces or ceilings.

Uses of Sikadur 31 EF

Structural adhesive and mortar for :

• Concrete elements
• Natural stone.
• Ceramic and fibre cement parts
• Mortar, bricks and masonry
• Steel, iron.
• Wood
• Polyester, epoxy

As a repair mortar and adhesive:

• Edges and corners
• Lakes and caves
• Vertical and ceiling applications

Joint filling and crack sealing :

• Repair of lips and cracks in seals

Benefits of Sika Sikadur 31 EF

• Easy to mix and apply.
• Good adhesion to most building materials.
• Thixotropic, does not sag in vertical or ceiling applications.
• Hardens without shrinking.
• The components are of different colors, which facilitates the control of the mixture.
• No priming is required.
• Abrasion resistant.
• Impermeable to liquids and water vapor.
• Good chemical resistance.

Approvals / Standards

Sikadur 31 EF structural binder for mortar or concrete bonding according to UNE EN 1504-4:2004 with performance declaration 01 04 02 03 001 0 000144 1053, with production certificate according to Notified Body No. 0099-CPR-B15-0008, with CE marking.

Description of Sika Sikadur 31 EF

• Chemical base: Epoxy resin
• Packaging: Pre-measured batches of 18, 6 and 1.2 kg.
• Color

Comp. A: light grey

Comp. B: dark grey.
Mixture A+B: grey concrete

• Storage:24 months from date of manufacture in original, tightly closed and undamaged containers in dry conditions at temperatures between +5ºC and +30ºC.
• Storage conditions: Protect from direct sunlight.
• Density: 1.7 ± 0.1 kg/l (mixture A+B) (at +23ºC)

Sika Sikadur 31 EFTechnical Information

• Compressive strength

Curing time	+10ºC	+23ºC	+30ºC
1 jour	~15 N/mm2	~29 N/mm2	~34 N/mm2
3 jours	~30 N/mm2	~39 N/mm2	~46 N/mm2
7 jours	~38 N/mm2	~47 N/mm2	~51 N/mm2
14 jours	~45 N/mm2	~53 N/mm2	~55 N/mm2

• Modulus of elasticity in compression :

~ 6500 N/mm2 (14 days at +23ºC) (ASTM D 695)

Flexural strength

Temps de durcissement	+10ºC	+23ºC	+30ºC
1 jour	~6 N/mm2	~10 N/mm2	~20 N/mm2
3 jours	~20 N/mm2	~21 N/mm2	~26 N/mm2
7 jours	~25 N/mm2	~28 N/mm2	~29 N/mm2
14 jours	~30 N/mm2	~32 N/mm2	~30 N/mm2

• Elasticity Module:

~ 7700 N/mm2 (14 days to +23ºC)
(ASTM D 695)

• Tensile strength

Curing time	+10ºC	+23ºC	+30ºC
1 day	~7 N/mm2	~10 N/mm2	~11 N/mm2
3 days	~18 N/mm2	~20 N/mm2	~24 N/mm2
7 days	~21 N/mm2	~22 N/mm2	~25 N/mm2
14 days	~24 N/mm2	~24 N/mm2	~29 N/mm2

• Tensile adhesion

Curing time	Temperature	Support	Adhesion
1 day	10ºC	Hormigón seco	> 3 N/mm2*
1 día	+10ºC	Hormigón húmedo	> 3 N/mm2*
7 days	+25ºC	steel	18 N/mm2

* In both cases, the failure of the concrete

Cracking

Hardens without shrinking

Coefficient of thermal expansion

W coefficient (according to EN 1770) :
4.6 10-5 per °C (temperature range -20°C to +40°C).

Temperature of thermal deflection

Thermal Deflection Temperature (TDC) (per ASTM D 648):
+53ºC (at 7 days and +23ºC).

Application Information

• Mixing ratio: Comp. A : Comp. B = 3:1 by weight or volume.

• Layer thickness: 30 mm maximum of Sikadur 31 EF. If greater thickness is required, it can be applied in successive layers. If different batches are used, do not mix the next batch until the previous one has been completed so as not to reduce the workability time.

• Thixotropy:On vertical surfaces, it does not sag up to a thickness of 10 mm in a single layer (according to EN 1799).

• Product Temperature: Sikadur 31 EF must be applied at a temperature between +10°C and +30°C.

• Ambient temperature: +10 ºC minimum / +30 ºC maximum.

• Dew point : Beware of condensation! The ambient temperature during application must be at least 3ºC above the dew point.
• Substrate temperature : +10 ºC minimum / +30 ºC maximum.

• Substrate Moisture : When applying to concrete with matted moisture, use extra caution when applying the first coat.

• Lifetime of the mixture :

Shelf life (200 g)

+10ºC	+23ºC	+35ºC	+40ºC
~ 120 minutes	~ 80 minutes	~ 42 minutes	~30 minutes

Consumption of SIKA Sikadur 31 EF

~ 1.7 kg/m2, per mm thickness

Substrate Quality :

Mortars and concretes must be more than 28 days old (according to minimum strength requirements).Check the solidity of the support (concrete, masonry, natural stone).

The surface must be clean, dry, compact and free of surface laitance, ice, standing water, grease, oils, old treatments, loose or poorly adhering parts.

Steel substrates must be rust free and clean according to Sa 2.5.The substrate must be sound and all loose particles must be removed.

Substrate Preparation

• Concrete, mortar, stone or brick:
  The surface must be sound, clean, free of standing water or ice, grease, oil, dust, old paint, loose or poorly adhering parts. Cement laitance should be removed and a textured, open-pore surface should be obtained.
• Steel :
  Must be clean and properly prepared, e.g. by sandblasting and cleaning of generated dust. Beware of water condensation (dew point).

Mixing of SIKA Sikadur 31 EF

Mix components A+B for at least 3 minutes with a low-speed mixer (max. 300 rpm) until Sikadur 31 EF has a uniform grey color and the correct consistency.

Avoid air entrapment during mixing. Then pour the product into another clean container and stir again for 1 minute, trying to minimize air entrapment.

Mix only the amount that can be used, taking into account the shelf life of Sikadur 31 EF.

Tool Cleaning

Clean all tools and instruments with Sika Colma Cleaner immediately after use. Cured product can only be removed by mechanical means.