Sikadur-31+ - EC 1 PLUS Epoxy Adhesive - Sika

Sikadur-31+ - EC 1 PLUS Epoxy Adhesive - Sika

Sikadur-31+ is a structural, thixotropic, two-component, epoxy resin -based adhesive product with low VOC content and low sensitivity to moisture, which bonds most building materials.

It exhibits high mechanical resistance and can also be used for structural repairs of concrete structures and for filling inert joints and cracks .
Sikadur-31+ can be used for traditional professional applications and also for DIY applications.
EC 1 PLUS label: very low VOC emissions .

Features

• Mix and apply easily
• EC1 PLUS label: very low VOC emissions
• Excellent adhesion to most building materials. High initial and final mechanical strength.
• Suitable for structural concrete repair, class R4. Good adhesion to dry or damp concrete (but matte/dry surface).
• Thixotropic: does not slip during vertical applications and on ceilings
• No need for a primary school
• Good resistance to abrasion and chemicals
• Components of different colors (mixing control)
• Waterproof against most liquids and water vapor
• Hardening without shrinkage
• Application up to 30 mm thick in a single layer
• Usable at temperatures between +10°C and +30°C

Areas of application

• Suitable for structural repair of concrete (Principle 3, Method 3.1 of standard EN 1504-9).
  Repair of cracked and damaged concrete in buildings, bridges, infrastructure works and superstructures.
• Suitable for structural reinforcement (Principle 4, Method 4.3 of standard EN 1504-9).
  Bonding of plates.
• Suitable for structural reinforcement (Principle 4, Method 4.4 of standard EN 1504-9).
  Adding mortar or concrete.
• The product can be used indoors and outdoors.

Structural adhesive for bonding:

• Concrete elements
• Hard natural stone
• Ceramics, fiber cement
• Mortar, bricks, masonry
• Steel, iron, aluminum
• Drink
• Polyester, epoxy
• Glass

Repair and reprofiling for:

• Structural concrete elements (beams, columns, walls, etc...) and non-structural elements.
• Small areas and corners
• Gravel nests
• Metal profiles
• Brick slip bonding

Filling and sealing for:

• Inert joints and cracks
• Sealing of non-structural static cracks
• Holes and cavities

Application

Adhesive product

1. Apply the mixed adhesive product to the prepared surfaces using a spatula, trowel, notched trowel or gloved hand.
2. For optimal adhesion, apply the adhesive to both surfaces that are to be glued together.
3. For heavy components placed vertically or overhead, provide temporary support until the product has completely dried/cured.
   This drying and hardening process depends on ambient temperatures.

Repair of concrete structures

1. Apply the mixed adhesive product to the prepared surfaces using a spatula, trowel or gloved hand.
2. Use temporary formwork if necessary.

Filling joints and sealing cracks

1. Apply the mixed product to the prepared surfaces using a spatula or trowel.

Appearance

• Component A: white
• Component B: dark grey
• Component A+B: concrete grey

Consumption

~ 1.9 kg / m² / mm

Packaging

• 1.2 kg A+B kit
• 6 kg A+B kit

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FAQ - Frequently Asked Questions

1. Can Sikadur-31+ be applied to a surface that is already damp?
   Yes, provided it's "slightly damp" (matte, without a film of water on the surface). No specific primer is needed. However, if the surface is very wet or has standing water, it's not suitable.
2. Can this product be used outdoors and indoors?
   Yes, it is suitable for both environments.
3. What is the temperature range for implementation?
   The ambient and substrate temperatures must be between +10 °C and +30 °C.
4. Is the product tolerant of splashes or water seepage after hardening?
   Yes, once cured, the product offers good impermeability to water vapor and most liquids. However, it is not designed for active (moving) cracks or joints subject to significant movement.
5. Can this product be applied in a thick layer?
   Application up to 30 mm thick in a single layer is possible. Beyond that, it is recommended to apply in several successive layers after intermediate curing, adapting the roughness of the previous layer accordingly.
6. Does the product contain a lot of VOCs (volatile organic compounds)?
   No: the EC1 PLUS label indicates very low VOC emissions. Indoor air emissions are classified A+.
7. Is it compatible with metal or aluminum?
   Yes: among the substrates mentioned are steel, aluminum, and cast iron. Of course, it will be necessary to ensure that the metal is clean, degreased, and possibly pickled, according to standard practices.
8. Does the mixture need to be very precise?
   Yes, respect the ratio (A/B = 2/1 weight or volume) and mix well for homogeneity and to avoid bubbles: components of different colors help to check.
9. Can the element be peeled off or removed after it has hardened?
   No, once hardened, the adhesive is very strong; removal can only be done mechanically.
10. Is there a mandatory primer or bonding coat?
    No, the product is designed to be used without a primer. However, the surface must be properly prepared (clean, dry/matte, dust-free, and free of film) to ensure adhesion.