Sikaflex® PRO-3 Purform® PowerCure

• CE marking and declaration of performance based on EN 15651-1:2012 Sealants for non-structural use in joints in buildings and pedestrian walkways — Part 1: Sealants for facade elements

• CE marking and declaration of performance based on EN 15651-4:2012 Sealants for non-structural use in joints in buildings and pedestrian walkways — Part 4: Sealants for pedestrian walkways

• Testing of the booster accelerated joint sealant EN 15651-1, SKZ, No.220740/21-IV

• Testing of the booster accelerated joint sealant EN 15651-4, SKZ, No. 220740/21-V

• Testing of the booster accelerated sealant ISO 11600, SKZ, No.220740/21 -VI

Accelerated Sika® Purform® Polyurethane Technology

15 months from date of production

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.

Refer to the current Safety Data Sheet for information on safe handling and storage.

• Non-staining on many natural stones according to ASTM 1248-04 and ISO 16938-1.

• To confirm suitability, tests must be carried out according to ISO 16938- 1 or ASTM 1248-04 before using on natural stones and full project application.

FINAL SHORE A HARDNESS

80 % DEVELOPMENT OF SHORE A HARDNESS

DEVELOPMENT OF SHORE A HARDNESS

Testing conditions +23 °C and 50 % rH.

Resistant to many chemicals. Refer to Testing of the booster accelerated joint sealant EN 15651-4, SKZ, No. 220740/21-V test report for water and salt water. Contact Sika Technical Services for additional information.

The joint dimensions must be designed to suit the movement capability of the sealant. The joint width must be a minimum of 10 mm and a maximum of 40 mm.

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 adjacent building materials

• Joint sealing material

• The specific exposure of the building and the joints

A width to depth ratio of 1:0.8 for floor joints must be maintained (for exceptions, see table below).

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

For details of joint design and calculations refer to the following document, Design guideline: Dimensioning of construction joints.

Beware of condensation. Substrate temperature during application must be at least +3 °C above dew point.

Use closed cell, polyethylene foam backing rod

Primers are adhesion promoters and not an alternative to improve poor preparation or cleaning of the joint surface.

Note: Primers also improve the long term adhesion performance of the sealed joint.

Substrate testing

Note: Adhesion tests on project specific substrates must be performed and procedures agreed with all parties before full project application. For more detailed advice and instructions contact Sika Technical Services.

The substrate must be sound, clean, dry and free of contaminants such as dirt, oil, grease, cement laitance, sealant residues and poorly bonded coatings which could affect adhesion of the primer and sealant.

The substrate must be of sufficient strength to cope with the stresses induced by the sealant during movement.

1. Use techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools to remove all weak substrate material.
2. Repair all damaged joint edges with suitable Sika repair products.
3. Remove all dust, loose and friable material from all surfaces before application of the sealant.

If tested or supported by experience, the Product can be used without primers or activators on many substrates.

Carry out the following priming or pre-treatment procedures to ensure optimum adhesion and joint durability, or if you use the Product for high-performance applications such as joints on multi-storey buildings, highly stressed joints, or joints exposed to extreme weather.

NON-POROUS SUBSTRATES

Aluminium, anodised aluminium, stainless steel, galvanised steel or glazed tiles.

1. Lightly roughen the surface with a fine abrasive pad.
2. Clean and pre-treat using Sika® Aktivator-205 with a clean cloth.

Other metals, such as copper, brass and titanium-zinc.

1. Lightly roughen the surface with a fine abrasive pad.
2. Clean and pre-treat using Sika® Aktivator-205 with a clean cloth.
3. Wait until the flash off time has been achieved.
4. Apply Sika® Primer-3 N by brush.

Powder coated metals

1. Carry out preliminary trials to verify adhesion, contact Sika ® Technical Services for further information.

PVC substrates.

1. Clean and pre-treat using Sika® Primer-215 applied with a brush.

POROUS SUBSTRATES

Concrete, aerated concrete and cement based renders, mortars and bricks.

1. Prime surface using Sika® Primer-3 N applied by brush.

Concrete that is 2–3 days old, or matt wet (surface dry) .

1. Prime surface using Sika® Primer-3 N applied by brush.

Reconstituted, cast stone or natural stone.

1. Carry out preliminary trials to check if the stone experiences plasticiser migration. For a suitable primer to prevent plasticiser migration, contact Sika ® Technical Services for further information.

ASPHALT (ACCORDING TO EN 13108-1 AND EN 13108-6)

Fresh cut or existing cut asphalt must have a clean bonding surface with minimum 50 % exposed aggregate.

1. Prime surface using Sika® Primer-3 N applied by brush.

For more details of the primer or pre-treatment products refer to the individual Product Data Sheet. Contact Sika Technical Services for additional information.

1-part accelerated by PowerCure®

IMPORTANT

Strictly follow installation procedures

Strictly follow installation procedures as defined in Method Statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

IMPORTANT

Swimming pools

Do not use to seal joints in and around swimming pools.

IMPORTANT

Alcohol affecting the curing mechanism

Exposure to alcohol during curing may interfere with the curing reaction and cause the Product to be tacky.

• Do not expose the Product to alcohol containing products during the curing period

1. Apply masking tape where neat or exact joint lines are required.
2. After the required substrate preparation, insert a backing rod to the required depth.

3. Prime the joint surfaces as recommended in substrate preparation.

   Note: Avoid excessive application of primer to avoid causing puddles at the base of the joint.
4. Set up the PowerCure Dispenser according to the PowerCure User Manual.
5. Cut the nozzle to the required bead size.

6. IMPORTANT Replace the mixer if the application is discontinued for more than 10 minutes (at +23 °C). Extrude the Product into the joint ensuring that it comes into full contact with the sides of the joint and avoiding any air entrapment.

   Note: Temperature will affect Product reactivity and application properties.
7. IMPORTANT Do not use tooling products containing solvents. As soon as possible after application, tool the sealant firmly against the joint sides to ensure adequate adhesion and a smooth finish. Use a compatible tooling agent such as Sika® Tooling Agent N to smooth the joint surface.
8. Remove the tape within the skinning time of the Product after finishing.

OVER-PAINTING THE SEALANT

IMPORTANT

Tacky paint over the sealant

Some paint systems may exhibit plasticiser migration that will cause the painted surface to be tacky.

1. Consult the paint manufacturer for specific advice on over-painting sealants.
2. Trial the paint system with the Product prior to undertaking the project.

IMPORTANT

Cracking paint over the sealant

Rigid paint systems reduce the elasticity of the Product and may crack when used on joints subject to movement.

• Do not use rigid paint systems to over-paint joints subject to movement.

The Product can be over-painted with most conventional paint coating systems. Prior to application test the paint system for compatibility.

1. Allow the Product to fully cure before over-painting.
2. Carry out preliminary trials to test the paint for compatibility in accordance with ISO/TR 20436:2017 - Buildings and civil engineering works — Sealants — Paintability and paint compatibility of sealants

Colour variations

Note: Colour variations may occur due to the exposure in service to chemicals, high temperatures or UV-radiation (especially with white colour shade). This effect is aesthetic and does not adversely influence the technical performance or durability of the product.