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Joint Sealing


Sikaflex Pro-2 HB

1-part low modulus polyurethane sealant for building joints.

Product Description:

Sikaflex® PRO-2 HP is a one part, moisture curing, low modulus elastic joint sealant based on polyurethane. Suitable for movement and connection joints for indoor and outdoor applications.


Sikaflex® PRO-2 HP is suitable for sealing joints in civil engineering building construction especially for movement joints in concrete but also for joints in facades, balcony parapets, connection joints (around windows and doors, facades, metal cladding, precast concrete) as well as joints in wood and metal structures.

Characteristics / Advantages:

  • Good weather and ageing resistance
  • Movement capability 25%
  • Bubble-free curing
  • Low stress to the substrate
  • Easy to smooth and very good workability
  • Very good adhesion to many substrates
  • High tear strength


Approval / Standard:
Conforms to the requirements of ISO 11600, F 25 LM.

Product Data:



White, grey, dark grey, black, other colours to order


310 ml cartridges 600 ml sausages

Storage Conditions / Shelf-Life:

15 months from date of production if stored in undamaged original sealed containers, in dry conditions and protected from direct sunlight at temperatures between +10°C and +25°C.

Technical Data:

  • Chemical Base 1-part polyurethane, moisture curing.
  • Density ~ 1.3 kg/l (colour concrete grey) (DIN 53 479)
  • Skinning Time ~ 60 - 120 minutes (+23°C / 50% r.h.)
  • Curing Rate ~ 2 - 3 mm/24 h (+23°C / 50% r.h.)
  • Movement Capability 25%
  • Joint Dimensions Min. width = 10 mm / max. width = 40 mm The sealing of joints of widths less than 10mm may be possible providing the sealant remains within its stated movement capability MAF and all joints are designed in accordance with B.S 6093: 1993.
  • Sag Flow 0 mm, very good (DIN EN ISO 7390)
  • Service Temperature -40°C to +70°C

Mechanical / Physical Properties:

  • Tear Strength ~ 7 N/mm (+23 °C / 50% r.h.) (DIN 53 515)
  • Shore A Hardness ~ 25 after 28 days (+23°C / 50% r.h.) (DIN 53 505)
  • E-Modulus ~ 0.3 N/mm2 at 100% elongation (+23°C / 50% r.h.) (DIN EN ISO 8340) ~ 0.6 N/mm2 at 100% elongation (-20°C)
  • Elongation at Break ~ 800% (+23°C / 50% r.h.) (DIN 53 504)
  • Elastic Recovery > 80% (+23°C / 50% r.h.) (DIN EN ISO 7389 B)

System Information:

Application Details:
The joint width must be designed to suit the movement capability of the sealant. In general the joint width must be > 10 mm and < 40 mm. A width to depth ratio of ~ 2 : 1 must be maintained.

Standard design dimensions for concrete elements as per DIN 18 540:

Joint distance 2m 2 - 3.5 m 3.5 - 5 m 5 - 6.5 m 6.5 - 8 m
Design joint width 15mm 20mm 25mm 30mm 35mm
Min. joint width 10mm 15mm 20mm 25mm 30mm
Joint depth 8mm 10mm 12mm 15mm 15mm

Minimum joint width for perimeter joints around windows: 10 mm All joints must be properly designed and dimensioned by the specifier and the main contractor in accordance with the relevant standards, because changes are not usually feasible after construction. The basis for calculation of the necessary joint widths are the technical values of the joint sealant and the adjacent building materials, plus the exposure of the building, its method of construction and its dimensions.

Approximate consumption:

Joint width 10mm 15mm 20mm 25mm 30mm
Joint depth 8mm 8mm 10mm 12mm 15mm
Joint length / 600ml~ 7.5m~ 4.5m~ 2.5m~ 1.6m~ 1.3m~

Consumption /Joint Design:

Backing: Use only closed cell, polyethylene foam backing rods.

Substrate Quality Clean and dry, homogeneous, free from oils and grease, dust and loose or friable particles. Cement laitance must be removed.

Substrate Preparation / Priming:

Non porous substrates:
E.g. metals, powder coatings etc. have to be cleaned with a fine abrasive pad and Sika® Cleaner-205 by using a clean towel / cloth. After a flash off time of at least 15 min, apply Sika® Primer-3 N by using a brush. Before sealing allow a flash off time of at least 15 min. (max. 8 hrs.). For PVC use Sika® Primer-215. Before sealing allow a flash off time of at least 15 min. (max. 8 hrs.).

Porous substrates:
E. g concrete, aerated concrete and cementitious renders, mortars, brick, etc. have to be primed with Sika® Primer-3 N by using a brush. Before sealing allow a flash off time of at least 15 min. (max. 8 hrs.). Important note: Primers are only adhesion promoters. They neither substitute for the correct cleaning of the surface nor improve their strength significantly. Primers improve long term performance of a sealed joint. For further information refer to the Sika® Primer table.

Application Conditions / Limitations:

  • Substrate Temperature +5°C min. / +40°C max.
  • Ambient Temperature +5°C min. / +40°C max.
  • Substrate Moisture Content Dry

Application Instructions:

Application Method / Tools:
Sikaflex® PRO-2 HP is supplied ready to use.

After suitable joint and substrate preparation, insert backing rod to required depth and apply primer if necessary. Insert cartridge into sealant gun and firmly extrude Sikaflex® PRO-2 HP into joint making sure that it is full contact with the side of the joint. Fill the joint, avoiding air entrapment. Sikaflex® PRO-2 HP must be tooled firmly against joint sides to ensure good adhesion. Masking tape must be used where sharp exact joint lines or exceptionally neat lines are required. Remove the tape whilst the sealant is still soft. Smooth joint with smoothing liquid for a perfect sealant surface.

Cleaning of Tools:

Clean all tools and application equipment with sealant remover / Sika® Remover- 208/ Thinner C immediately after use.

Hardened / cured material can only be mechanically removed.

Notes on Application / Limitations:

Elastic sealants may not be over painted.

Compatible coatings may cover the joint sides to max. 1 mm.

The compatibility must be tested according to DIN 52 452-2.

Colour deviations may occur due to exposure to chemicals, high temperatures, UV radiation (especially with colour shade white). However a change in colour will not adversely influence the technical performance or the durability of the product. Before using on natural stone contact our Technical Department:

Do not use Sikaflex® PRO-2 HP as a glass sealer, on bituminous substrates, natural rubber, EPDM rubber or on building materials which might bleed oils, plasticisers or solvents which could attack the sealant.

Do not use Sikaflex® PRO-2 HP to seal swimming pools.

Please consult our Technical Department before applying Sikaflex® PRO-2 HP in joints with permanent water immersion. The freshly applied sealant has a smell similar to 'Marzipan' until it has fully cured (benzalehyde).

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