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Epoxy Resin Bonding Agent:   

Sikadur 32 - Epoxy resin bonding agent
Sikadur 32 is a high performance bonding agent based on a 2 component solvent free epoxy resin ideally suited to a wide range of building and civil engineering applications.
Sikadur-32 may be used to bond epoxy mortars, fresh cementitious concrete or mortar to a wide variety of surfaces including mineral substrates (concrete, brick, stone, mortar, GRC, fibrous cement), wood, iron and steel and cured epoxy mortars. Sikadur-32 exhibits excellent adhesion enabling it to be successfully employed in both structural and non-structural situations. Special high strength grades can be made to order.

Shrink free

Insensitive to moisture during application, cure or whilst in service
Applicable at low temperatures down to 5 C

Excellent adhesion to most building materials even when damp

Available in two grades (Normal and Long Potlife)

High tensile and flexural strength

Supplied in factory proportioned units

Easily applied

Proven in service for over 25 years worldwide
Storage and Shelf Life
Minimum shelf life is approximately 3 years. Store under controlled conditions in original containers (minimum 5 C, maximum 35 C temperature range).

Instructions for Use

Surface Preparation
Mineral/Resin Substrates. Mechanically roughened, free from all contaminants (eg. dust, oils, grease, ice, etc.), surface water, laitance, old form oil, curing membrane and old coatings. Suitable methods of preparation include blast cleaning and scabbling (sanding/grinding on fibrous cement). Wood. Mechanically sanded, free from all contaminants (dust, oils, grease, etc.) surface water, stains, impregnants and old coatings. Iron/Steel. Mechanically cleaned, free from all contaminants (dust, oils, grease, etc.) coatings and corrosion products and surface water for maximum bond strengths. Suitable methods include blast cleaning to minimum standards Sa2 AS 1637.9 or equivalent methods to St3 AS 1627.9.
Sikadur-32 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/stirrer with a windmill type paddle (max. speed 600 rpm). Decant all Part B into Part A and mix thoroughly together until a uniform colour is achieved (typically 3 mins). Apply immediately.
Apply a thin layer of Sikadur-32 to the prepared substrate by brush or roller. Ensure the product is worked well (scrubbed) into the substrate. This is particularly important on damp surfaces. Ensure the attainment of an overall glossy sheen. Any shear connectors or similar must also be coated. Apply the fresh concrete or mortar whilst the Sikadur-32 is still tacky. Apply epoxy mortars within 24 hours.
Uncured material may be cleaned from application tools etc. by using Sika Colma Cleaner (flammable solvent). Cured material can only be removed mechanically.
Technical and Physical Data


Slightly thixotropic liquid


1.4 kg / litre approx.

Volume solids

100% (solvent free)

Mix ratio

A : B = 2 : 1 by weight

Secant Flexural Modulus of Elasticity (BS 6319) @ 7 days

2.0 GPa approx.


Comprehensive strength@ 7 days (BS 6319) @ 24 hours

60 MPa approx.

14 MPa approx.

Flexural strength @ 7 days (BS 6319)

28 MPa approx.

Tensile strength @ 7 days (BS 6319)

13 MPa approx.

Adhesion to concrete

>3 MPa approx. (concrete failure all grades)

Adhesion to sandblasted steel @ 10 days

20 MPa approx.

Application Temperature (min.- max.)

20 C - 40 C(substrate and ambient temperatures)

ASTM C881-78

Complies with Type II, Grade 2 Class B & C


0.25 to 0.8 kg/m2 (typically 0.4/0.5 kg/m2) (dependent on surface profile, texture, temperature and wastage)




3 litre, 18 litre net pre-proportioned kits

Potlife (3 litre mix)



20 C 75 mins approx.

35 C 23 mins approx.

Open Time



40 C 4 hours approx.

30 C 8 hours approx.

20 C 12 hours approx

Bond coat of Sikadur-32 applied immediately after mixing

Important Notes:

Do not apply Sikadur-32 to surfaces with standing water. Maximum moisture content of the concrete 10%.

Do not mix part kits.

Only mix as much as can be applied within the stated potlife.

Do not dilute the product with solvent as this will affect the cure and inservice performance.

Service temperatures >70  may affect the performance of the product.

Lower temperature (substrate/ambient) during storage/application will increase the material consumption due to a rise in viscosity.

Minimum application thickness 0.1 mm as bonding agent.

If Sikadur-32 has exceeded it's open time, another coat must be applied within 24 hours. After 24 hours the surface must be mechanically abraded then washed clean with Sika Colma Cleaner. Allow to dry before recoating.

It is important to observe proper concreting practice when applying concrete toppings and screeds on substrates coated with Sikadur-32. Correct placement and curing techniques must be observed to prevent excessive and rapid drying of the mix.

If in doubt, consult our Technical Department.

The temperature at which the Sikadur-32 is stored during the 24 hours before it is mixed will govern it's 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 markedly. 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.
Handling Precautions

Avoid contact with the skin, eyes and avoid breathing it's vapour.

Wear protective gloves when mixing or using.

If poisoning occurs, contact a doctor or Poisons Information Centre.

If swallowed, do NOT induce vomiting. Give a glass of water.

If skin contact occurs, remove contaminated clothing and wash skin thoroughly.

If in eyes, hold eyes open, flood with water for at least 15 minutes and see a doctor.    


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