Sikaflex® PRO-3

Polyurethane sealant for floor joints and civil engineering applications

Sikaflex® PRO-3 is a 1-part, polyurethane, tough, coloured, elastic joint sealant for sealing many types of joint configurations in floors and civil engineering structures. It provides a waterproof seal with good mechanical properties, is resistant to chemicals and remains elastic over a wide range of temperatures.

  • Movement capability ± 35 %
  • Good mechanical and chemical resistance
  • Bubble-free curing
Sikaflex® PRO-3   Sikaflex® PRO-3
 
 

Usage

Horizontal and vertical interior and exterior sealing joint applications:

  • Food industry
  • Cleanrooms
  • Sewage treatment plants
  • Tunnels

Sealing horizontal and vertical joints for:

  • Floors
  • Pedestrian and traffic areas
  • Car park parking decks
  • Warehouse and production floor areas

Advantages

  • Movement capability ± 35 %
  • Good mechanical and chemical resistance
  • Bubble-free curing
  • Over-paintable
  • Good adhesion to defined construction materials
  • Very low emissions

Packaging

300 ml cartridge

12 cartridges per box

600 ml cylindrical foil pack

20 foil packs per box

Colour

Concrete grey

Product Information

Product declaration

EN 15651-4: PW EXT-INT CC 25 HM

EN 14188-2 – Joint fillers and sealants – Cold applied joint sealants

BS 5212-1:1990 – Cold applied joint sealants systems for concrete pavements

Chemical base

Polyurethane i-Cure® Technology

Shelf life

15 months from date of production

Storage conditions

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +25 °C. Always refer to packaging.

Density

~1.35 kg/L

 (ISO 1183-1)

Application steps

SUBSTRATE PREPARATION

  • The substrate must be clean, dry, sound and free from oils, grease, dust, cement laitance and loose or friable particles.
  • Removal techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools can be used.
  • Damaged joint edges can be repaired with suitable Sika repair products.
  • Where joints in substrate are saw cut. After sawing, all slurry material, must be flushed away and joint surfaces allowed to dry.
  • All dust, loose and friable material must be completely removed from all surfaces before application of any activators, primers or sealant.

For optimum adhesion, joint durability and critical, high performance applications such as joints on multi-storey buildings, highly stressed joints, extreme weather exposure or water immersion / exposure, the following priming and/or pre-treatment procedures must be followed:

Non-porous substrates

  • Aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder coated metals or glazed tiles. Slightly roughen surface with a fine abrasive pad. Clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth. Before sealing, allow a waiting time of > 15 minutes (< 6 hours).
  • Other metals, such as copper, brass and titanium-zinc, clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours), apply Sika® Primer-3 applied by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).
  • PVC has to be cleaned and pre-treated using Sika® Primer-215 applied with a brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).

Porous substrates

  • Concrete, aerated concrete and cement-based renders, mortars and bricks surfaces must be primed using Sika® Primer-3 or Sika® Primer-210 applied by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).

Adhesion tests on project specific substrates must be performed and procedures agreed with all parties before full project application.

Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long-term adhesion performance of the sealed joint.

Technical Information

Shore A hardness

~37 (after 28 days)

 (ISO 868)

Secant tensile modulus

~0.60 N/mm2 at 100 % elongation (+23 °C)

(ISO 8339)
~1.10 N/mm2 at 100 % elongation (-20 °C)  

Movement capability

± 25 %

(ISO 9047)
± 35 % (ASTM C719)

Elastic recovery

~90 %

(ISO 7389)

Tear propagation resistance

~8.0 N/mm

 (ISO 34)

Service temperature

-40 °C to +70 °C

Chemical resistance

For chemical resistance refer to the following report: Chemical Resistance. DIN EN 14187, Sikaflex® PRO-3 (SL), SKZ, Report, 127980/17-IV

For resistance against water and salt water refer to the following report: Performance Test EN 15651-4, Sikaflex® PRO-3, SKZ, Report, 94931/11-I-E

Joint design

The joint width must be designed to suit the movement capability of the sealant. The joint width must be ≥ 10 mm and ≤ 40 mm. A width to depth ratio of 1:0.8 must be maintained (for exceptions, see table below).

Typical joint widths for joints between concrete elements for interior applications

Joint distance [m]

Minimum joint width [mm]

Minimum joint depth [mm]

 2  10  10
 4  10  10
 6  10  10
 8  15  12
 10  18  15

 

Typical joint widths for joints between concrete elements for exterior applications

Joint distance [m]

Minimum joint width [mm]

Minimum joint depth [mm]

 2  10  10
 4  15  12
 6  20  17
 8  28  22
 10  35  28

All joints must be correctly designed and dimensioned in accordance with the relevant standards and codes of practice before their construction. The basis for calculation of the necessary joint widths are the type of structure, dimensions, technical values of the adjacent building materials, joint sealing material and the specific exposure of the building and the joints.

For larger joints, contact Sika® Technical Services for additional information.

Sikaflex® PRO-3

Technical Data Sheet (TDS)

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