Sikadur®-52 AU

ASTM C881-78 Complies with Type 1, Grade 1 Class B & C

VIC Roads Section 687 compliant

(Contact Sika Technical for test results)

Minimum shelf life is approximately 3 years.

Store under controlled conditions in original containers (minimum 5°C, maximum 35°C temperature range).

1.1 kg / litre approx.

100% (solvent free)

300 mPa.s approx. @ 20ºC
110 mPa.s approx @ 35ºC
Note: 1 mPa.s = 1 centipoise

Low viscosity liquid

@24 hours 44 MPa approx. (AS 1478.2)

@ 7 days 54 MPa approx.   (AS 1478.2)

@ 7 days 26 MPa approx. (BS 6319)

Adhesion to concrete   (EN 1542)
>3.5 MPa approx. @ 20ºC (cohesive failure of concrete)

Adhesion to sandblasted steel   (EN 1542)
10 MPa approx. both grades

A : B = 2 : 1 by weight and volume for Normal

5ºC- 30ºC 
(substrate and ambient temperatures)

Temperature 
5ºC              70 mins approx. 
20ºC            27 mins approx. 
35ºC            16 mins approx. 

1.1 kg/m2 approx. per mm thickness
(dependent on surface profile, texture, temperature, porosity and wastage)

When applied as a primer/coating Sikadur-52 (au) should be worked well into the substrate. This is particularly important on damp surfaces. Ensure the attainment of an overall gloss sheen but do not allow the material to puddle. If Sikadur-52 (au) is used as a primer for Sikadur epoxy mortars and Sikafloor mortars and coatings it should be allowed to cure (but no more than 24 hours old) prior to applying the ensuing Sikadur/Sikafloor materials. (Please refer to the relevant Sikadur/Sikafloor Technical Data sheets for further details).
Application (continued)
When used to fill cracks Sikadur-52 (au) may be gravity fed or pressure injected for horizontal surfaces. Only pressure injection is suitable for vertical or overhead cracks.
To fill horizontal cracks under gravity construct a reservoir above the crack, fill with Sikadur-52 (au) and allow to penetrate. Residual material may be ground off when fully cured. Vertical and overhead cracks should have injection nipples fixed centrally over the crack (between 30 - 50 cm centres) using Sikadur-31 or Sika Anchorfix-1. Seal the surface of the crack with Sikadur-31 or Sika Anchorfix-1. Allow to cure.
Commence injection under pressure from one end of the crack (the lowest nipple on vertical cracks) until the Sikadur-52 (au) exudes from the next nipple, seal off the first and proceed to inject from the second nipple etc. Once the crack is filled and Sikadur-52 (au) fully cured remove the nipples and use a gas torch and paint scraper or grind the surface back to line and level. For further details on
crack injection please refer to our Technical Department.

• If the Part A shows signs of crystallisation, before application place the
• Sikadur-52 (au) cartridge or container in warm water (heated to 60°C) for at least one hour.
• Do not apply to surfaces with standing water or to water saturated cracks.
• For optimum penetration and adhesion substrates should be dry.
• Maximum moisture content of the substrate 10%.
• Do not part mix containers to avoid mix ratio errors.
• Do not dilute the product with solvent as this will affect both the cure and in-service performance.
• Constant in-service temperatures >70ºC may affect the performance of the product.
• Maximum application thickness 5mm.
• Not suitable for injection into cracks less than 0.2 mm or greater than 5mm
• wide. Unless injected under pressure in which case cracks down to 0.15mm are possible.
• Maximum permissible substrate temperature 30°C 
• Minimum age of new concrete 3 to 6 weeks, depending on thickness.
• Do not apply Sikadur-52 (au)to substrates lower than 5°C
• The temperature at which the Sikadur-52 (au) is stored during the 24 hours before it is mixed will govern its potlife when mixed.
• Compressive strengths etc. of epoxy resins must be qualified by the testing method eg. Test Standard or size of specimen under test and the rate at which the test piece is loaded while under test, as these factors will affect the result. Faster loading rates will generally give higher ultimate loads and vice versa. Also, a specimen at lower temperature will show higher strengths and vice versa.

All surfaces to be coated, should be mechanically roughened, free from all contaminants (eg. dust, oil, grease, etc.) surface water, laitance, old coatings, corrosion products. Suitable methods of preparation include blast cleaning and scabbling. For optimum penetration the substrate should be dry. When Sikadur-52 (au) is used to inject cracks, the cracks must be blown out with oil free, dry compressed air. Cracks in the width range of 0.2 - 5 mm may be successfully injected.

Sikadur-52 (au) is supplied in factory proportioned units comprising the correct quantities of Part A (Resin) and Part B (Hardener). Thoroughly stir both components separately using a slow running drill with a windmill type paddle (max. speed 600 rpm). Decant all of Part B into Part A and mix thoroughly (typically 3 mins). (Not applicable to twin cartridge packs).

Uncured material may be cleaned from application tools, etc. by using Sika
Colma Cleaner (flammable solvent). Cured material can only be removed mechanically.