Sikaflex® PRO-3 Purform®

• Conforms with LEED v4 EQ credit: Low-emitting materials

• VOC emission classification GEV Emicode EC1^plus

• 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

• CE marking and declaration of performance based on EN 14188-2:2004 Joint fillers and sealants — Part 2: Specifications for cold applied sealants

• Tensile Properties, Adhesion, Change of Volume tests ISO 11600 F Class 25 HM

• Standard Specification for Elastomeric Joint Sealants, ASTM C 920

• Chemical Resistance, DIN EN 14187, SKZ, Report No. 208323/20

• Determination of the staining, ASTM 1248-04, SKZ, Report No.205279/19-VI

• Waste water, DIBt, SKZ, Test Report No. 205279/19-V

• Outgassing VOC/SVOC, CSM procedures, Fraunhofer, Certificate, No. SI 1909-1140

• Testing of joint sealant for pedestrian walkways ISO 11618, SKZ, No. 205279/19-VII

• Sealants -Durability to extension compression, ISO 19862,Sikaflex® PRO-3 Purform

• Foodstuff and migration behaviour EN 1186, EN 13130, CEN/TS 14234, ISEGA, No. 54313 U 22

• AS/NZS 4020:2018 - Potable drinking water approved

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.

• EN 15651-4: PW EXT-INT CC 25 HM

• EN 14188-2: Class 35

• ISO 11600. Class 25 HM F

• ASTM C 920 – Type S, Grade NS, Movement Class 50 Use T1, Use NT, Use I Class 2, Use M ASTM C 920 – Type S, Grade NS, Movement Class 50 Use T1, Use NT, Use I Class 2, Use M ASTM C 920 – Type S, Grade NS, Movement Class 50 Use T1, Use NT, Use I Class 2, Use M ASTM C 920 – Type S, Grade NS,Movement Class 50, Use T1, Use NT, Use I Class 2, Use M

• Waste water test according to DIBT guidlines

• ISEGA certificate

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

~~40 (after 28 days)

Resistant to many chemicals. Refer to EN 14187-6 SKZ test report for chemical resistance and EN 15651-4 SKZ 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.

Example for typical joint widths for joints between concrete elements for interior applications considering 25 % movement capability according to EN 15651-4:

Example for typical joint widths for joints between concrete elements for exterior applications considering 25 % movement capability according to EN 15651-4:

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

For applications at temperatures below +5 °C, please contact Sika Techincal Services.

Note: The substrate temperature must be +3 °C above dew point temperature and free from frost and ice.

Use closed cell, polyethylene foam backing rod

~3.5 mm/24 hours (+23 °C / 50 % r.h.)

~50 minutes (+23 °C / 50 % r.h.)

~40 minutes (+23 °C / 50 % r.h.)

IMPORTANT

Bituminous, natural rubber or EPDM rubber substrates

Do not use the Product on any building materials which might leach oils, plasticisers or solvents that could degrade the sealant.

Primers are adhesion promoters and not an alternative to improve poor preparation / 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 all contaminants such as dirt, oil, grease, cement laitance, old sealants and poorly bonded coatings which could affect adhesion of the sealant.

The substrate should be of sufficient strength to cope with the stresses induced by the sealant during movement. Removal techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools must be used. Repair all damaged joint edges with suitable Sika repair products. All dust, loose and friable material must be completely removed from all surfaces before application of any activators, primers or sealant.

Where joints in the substrate are saw cut. After sawing, all slurry material must be flushed away and joint surfaces allowed to dry.

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

NON-POROUS SUBSTRATES

Aluminium, anodised aluminium, stainless steel, galvanised steel, powder coated metals, or glazed tiles.

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

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

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

PVC substrates.

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

POROUS SUBSTRATES

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

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

Reconstituted, cast or natural stone.

• Preliminary trials must be carried out to check if the stone experiences plasticiser migration. For a suitable primer to prevent plasticiser migration, contact Sika ® Technical Services for further information.

ASPHALT (ACC. 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.

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

Note: 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 ready to use

Clean all tools and application equipment immediately after use with Sika® Remover-208. Once cured, hardened material can only be removed mechanically. For cleaning skin use Sika® Cleaning Wipes-100.