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Sikaflex Pro polyurethane joint Sealant  :


Sikaflex PRO - High Performance polyurethane joint sealant




Sikaflex PRO is a one component, thixotropic, polyurethane based joint sealant. It cures under the influence of atmospheric moisture to form an elastomeric material with adhesive properties, in some cases without the need for priming of the substrate.


Specifications Satisfied:

Sikaflex-PRO is supplied throughout the world by Sika and conforms to the most stringent sealant standards, for example:

US Federal Specification TT-S-00230C, Type II, Class A.

BS4254: For one part polyurethane based sealants for the building industry. 

IS A 5758: For one part polyurethane based sealants for the construction industry. 




As an elastic joint sealant for: 

Expansion joints in buildings and civil structures above and below ground. 

Construction joints.

Joints in precast concrete elements. 

External walling and cladding joints. 

Infill panel joints. 

Curtain walling. 

Sanitary installations. 

Sealing around window and door frames. 

Flexible draught proofing. 

Sealing penetrations in walls or floors for ducts, piping etc. 

Retaining walls. 

Sealing joints in water retaining structures (water reservoirs)




New Sikaflex-PRO will bond well to well cleaned Sikaflex-PRO. 

Excellent adhesion on all cement based materials, brick ceramics, polyurethane, epoxy, most polyester, most metals and most timbers. 

High durability. 

Good weathering resistance. 

Non-sag on vertical and soffit joints up to 30 mm width. 

Short skinning time. 

Short cut off string, even after storage. 

Ready for immediate use - no mixing, saves time. 

No potential mixing errors or wastage due to mixed quantities being greater than required. 


Can be painted over with many water, solvent and rubber based paints (preliminary tests recommended). 

Approved for use in potable water (AS4020:2005). 

Resistant to bacterial attack.


Instructions for Use


Surface Preparation:


Clean, sound, dry and free of oil, grease and surface contaminants such as form release agents, curing membranes and hydrophobic water repellents. Thoroughly remove all loose particles and dust.


Masonry/Brick/Concrete: Any loose particles or laitance should be removed with a rotary mechanical wire brush followed by blowing out with oil free compressed air. Use Sika cementitious or epoxy mortars for making good spalled or damaged joints.


Metals: Surfaces must be free of rust, scale or oxide films and should be degreased using Sika Colma Cleaner, Acetone or M.E.K. 



(Refer to Primer Selection Guide for detailed information. This is a separate document).




Minimum application temperature 5 C. For easier use we recommend the material is stored between 10 C and 30 C prior to use. Sikaflex-PRO is available in 310 ml cartridges or 600 ml unipac. Cartridge: break the inner seal at nozzle end, affix nozzle and cut to accommodate the desired joint size. Unipac: slide unipac into the special applicator gun, then either "nick" the unipac wrapper at the extrusion end or cut off the very end of the sausage if it contains partially cured lumpy Sikaflex. Fit the gun with a suitable nozzle that has been cut to deliver the right bead size. All primer on joint sides, which is generally applied after backer rods or release tapes are in place (refer joint design section) must have not exceeded it's open time and it must be thoroughly dry and not just skinned over; otherwise in conditions of rising temperature trapped solvent can blow bubbles in the uncured sealant. Porous substrates such as poorly compacted or cracked concrete must have their porous bond area surfaces thoroughly sealed to avoid the possibility of air bubbles being blown into the uncured sealant if the substrate temperature rises.
Extrude the Sikaflex-PRO into the joint ensuring that no air is trapped in the joint. Wide joints will require more than one pass of the application gun to make sure that Sikaflex-PRO is in full contact with the sides and bottom of the joint. Tooling-off the sealant will assist by forcing the sealant into the joint against its sides and back up material; this will also break any air bubbles and expose any air pockets. Final tooling of the joint surface can be done effectively with a spatula dipped in a 20% solution of washing up detergent in water (test to ensure it does not discolour the cured Sikaflex-PRO) or a profiled piece of raw potato. When tooling off with detergent solution, ensure no solution is allowed to get onto adjacent joint sides/bonding areas before the sealant has reached the final tooling stage in those locations. When masking sides of joints for neatness, remove tape before the sealant cures. Always allow sufficient surface exposed to moisture. In conditions of low atmospheric humidity, say less than 45% R.H. at 20 C or <60% R.H. at 10 C when early joint movement is anticipated (eg. The joint has been sealed in the late afternoon sun and at sunset a rapid temperature drop is expected -   Canberra or   Alice Springs in winter), it is advisable to spray the surface of the tooled Sikaflex with a fine mist of water to promote early skinning. Seal joints in walls facing west in the morning.




Use Sika Colma Cleaner to remove uncured sealant from tools after first removing the bulk of the Sikaflex material with a scraper followed by a rag or paper tissue. Sikaflex Hand Cleaner will remove fresh and partially cured Sikaflex from the skin. Hardened material can only be removed mechanically.


Joint Design:


Permissible change in joint width at ambient temperatures:

above 0 C is +/- 30% of average joint width at the time of sealing

below 0 C is a total of +/- 20% of average joint width at the time of sealing

admissible total shear movement is 20% of joint width at time of sealing

For the successful sealing of joints with Sikaflex PRO it is essential that the following guidelines on joint configuration are observed:


General use: for joints up to 12 mm wide, width to depth ratio = 1:1 

                  for joints over 12 mm wide, width to depth ratio = 2:1

                   (minimum joint depth 8mm: maximum joint width 35mm).


An approximate rule of thumb for joints in pre-cast concrete   Joint interval (metres) up to 2.0 2.0-3.5 3.5-5.0 5.0-6.5 6.5-8.0    Joint width (mm) 10 15 20 25 30.   To ensure that the correct width to depth ratio is achieved and to provide a firm backing against which the sealant can be tooled off and also to prevent the sealant from adhering to the bottom of the joint, the space under the Sikaflex- PRO must be filled with a tight fitting, non-rotting, non-absorbent backing material eg. fibreboard combined with a bond breaking tape (eg. polypropylene or PVC) or, alternatively, an open cell polyurethane or closed cell polyethylene backer rod supplied by Sika. Open cell PU backer rod has the advantages of allowing moisture access to the front and back of the joint simultaneously facilitating faster curing. Also open cell PU backer rod is much more compressible than closed cell PE foam thus one diameter rod can be used in a much wider range of joint widths. Closed cell PE backer rod can cause bubbling in uncured sealant in rising temperature conditions if it's outer skin in punctured. It is essential that oil or tar impregnated backing materials are not used.


Technical Data (Typical)


White, Grey, Off White, Sandstone, Pale Brown, Dark Grey, Dark Amber, Brick Red, Redwood, Beige, Black


1.25 to 1.3 kg/litre depending on colour


Moisture curing polyurethane prepolymer


Refer separate Primer Selection Guide for more details

Application temperture

5 C to 40 C

Service temperture

-30 C to 70 C (maximum +40 C in water and temporarily +50 C)

Shelf life

Minimum 12 months stored dry below 30 C unopened in original containers

Shore A hardness

23 to 27 after 28 days (at 23 C, 50% R.H.)

Elastic Recovery (JIS A 5758 1992)


Tensile strength (JIS A 5758 1992)

>0.2 MPa @ 50% elongation @ +23 C

Tensile strength at break (JIS A 5758 1992)

>0.7 MPa

Elongation at break


Maximum working expansion and contraction

Refer Joint Design section

Skinning Time (at 23 C, 50% R.H.)

2 to 4 hours

Cure rate (at 23 C, 50% R.H.)

2 mm in first 24 hours


Chemical Resistance (rough guide only):


Long Term

Medium Term

Low to Very Low


Mineral oils

Organic solvents 

Sea water

Vegetable oils

Paint dilutents 

Dilute mineral acids 


Strong acids 

Dilute mineral alkalis 


Strong alkalis

Domestic sewage

Pool water 



Fuel oils





Sika Primer 1, 15

About 4-5m2 per litre of primer

Sika Primer 3

250 ml can of primer will normally be sufficient

Sika Primer 215 

for about 35-40 running metres of

Sika Primer 35 

12.5 mm (deep joint).

Sika Adhesive Cleaner 1

approx. 5-8 m2/litre


Sikaflex Estimating Chart


Quantities: a guide to Sikaflex-PRO quantities (for fillet work multiply metre runs per cartridge or 'unipac' by two).


Joint size in mm

Litre Sikaflex-PRO per metre run

Metre run per cartridge (310ml)

Metre run per 'unipac' (600ml)

5 x 5




5 x 10




5 x 15




10 x 10




10 x 15




10 x 20




10 x 25




15 x 10




15 x 15




15 x 20




15 x 25




15 x 30




15 x 40




20 x 10




20 x 15




20 x 20




25 x 12.5




25 x 15




25 x 20




25 x 25




30 x 15




30 x 20




30 x 25




40 x 20




40 x 25




40 x 30







310 ml cartridge per carton of 12

600 ml unipac per carton of 20

Sika Primers are supplied in 250 ml cans (Flammable)

Sika Adhesive Cleaner 1 is supplied in 250 ml and 1 litre cans (Flammable) 

Sika Colma Cleaner is supplied in 1 litre and 20 litre cans (Flammable)


Important Notes:


Sikaflex PRO is best stored at temperatures between 10 C and 25 C in dry areas. The storage temperature should not exceed 30 C for extended periods. For best results use opened cartridge or sausage the same day otherwise the Sikaflex PRO in the nozzle will cure and have to be removed. 

When applying sealant, avoid air entrapment. 

Joint movement must not exceed +/- 30% (above 0 C) of the width of the joint at the time it is sealed. 

Minimum joint width for caulking around window frames is 10mm. 

White colour material yellows with age. 

In some bathroom and kitchen environments Sikaflex PRO can be stained by interaction with other components used in the structure and finishes. Ceramic tile adhesives containing rubber from old car tyres could be the cause. 

Joints in low humidity environments should be sprayed with a mist of water as soon as tooling off is complete to accelerate the curing process and minimise the risk of early movement cracks. 

For specific chemical resistance please contact our Technical Service Department. 

If there is no history of a particular coating/paint being applied over cured Sikaflex PRO for a period of 6 months or more an over paintability test should be made to determine: 


1.  That the paint dries properly within the expected time frame. 

2.  That if the paint film dries satisfactorily it is not subsequently softened and/or stained where it comes into contact with the Sikaflex PRO when exposed to the heat of the sun. 

3. That the adhesion of the paint/coating is satisfactory to the Sikaflex PRO. 

Conduct a simple test, overpaint a cured sample of Sikaflex PRO, allow the normal drying time for the coating to elapse and then expose it to a temperature of 80 C continuously for seven days. Sika's technical department can conduct this testing. 


Do not paint Sikaflex PRO with Sikagard-680S - it will not dry satisfactorily. 

Does not use Sikaflex PRO to seal joints in chlorinated swimming pools or spa pools because occasional over dosing with chlorine etc. can eventually cause the Sikaflex PRO surface to become sticky. 


Where possible backer rod should be placed in a joint before it is primed. 

Do not twist or puncture closed cell polyethylene backer rod during installation, this can lead to "out gassing". The gas from the backer rod blows bubbles into freshly applied Sikaflex PRO during conditions of rising temperature. 

Open cell backer rod allows moist air access to the bottom of the joint so that the Sikaflex PRO can cure simultaneously from the front and back of the joint. 

Sikaflex PRO should be used with care in resealing joints that were previously filled with silicone sealant. Consult out Technical Department. 

Not to be used in glazing applications where the Sikaflex to glass bond is exposed to direct or indirect sunlight or UV radiation. 

Alcohol containing solvents should not be used as a tooling aid, as these will inhibit the cure of polyurethane adhesives / sealants.

Epoxy resin coatings should be fully cured prior to the application of the adhesive / sealant as the uncured amine component could inhibit the cure of polyurethane adhesives / sealants.


Handling Precautions:


Sika sealants are generally harmless provided that certain precautions normally taken when handling chemicals are observed. The uncured materials must not, for instance, be allowed to come into contact with foodstuffs or food utensils, and measures should also be taken to prevent the uncured materials from coming into contact with the skin, since people with particularly sensitive skin may be affected. The use of protective clothing, goggles, barrier creams and rubber gloves is recommended. The skin should be thoroughly cleansed at the end of each working period either by washing with soap and warm water or by using a resin removing cream - the use of powerful solvents is to be avoided. Disposable paper towels, not cloth towels should be used to dry the skin. Adequate ventilation of the working area is recommended. In case of accidental eye or mouth contact, flush with water. Consult a doctor immediately. 


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