Sikaflex Construction Purform – PU joint sealant

Sikaflex Construction Purform

Elastic 1K PU joint sealant for perimeter and movement joints in building envelopes, indoors and outdoors. The following description summarizes the most important manufacturer specifications for selection and application in a practical manner.

Advantages

• Very good adhesion to many common construction substrates
• Good weather and aging resistance
• Permissible total deformation: 25%
• Low stress on joint edges
• Easy to apply, very short cure time and tack-free surface
• Purform® PU technology with very low monomer content (< 0.1% free monomeric diisocyanates)
• Odorless, solvent-free and very low emissions

Applications

• Perimeter joints around windows and doors
• Roller shutter boxes, facades and metal cladding
• Perimeter joints on concrete components
• Movement joints in balconies, masonry, concrete and aerated concrete

Technical Data

• Chemical basis: moisture-curing Purform® polyurethane technology
• Permissible total deformation: 25%
• Operating temperature: -40 °C to +70 °C
• Shelf life: 15 months if stored properly
• Packaging: 600 ml sausage; 20 sausages per carton
• Colors according to SIKA: Uniwhite, Light Concrete Grey, Concrete Grey, Medium Grey, Anthracite Grey, Black

Certifications & Testing

• EMICODE EC1PLUS – very low emissions
• LEED v4 EQc 2 – low-emission materials
• CE/Declaration of Performance according to DIN EN 15651-1 for facade joints

Application & Substrate

• Joint edges must be load-bearing, firm, clean and dry, as well as free from oil, grease and loose particles.
• Joint sizing and backer rod must suit the expected movement; for window perimeter joints, a minimum joint width of 10 mm must be taken into account.
• Depending on the substrate and exposure, SIKA cleaners or primers may be required.

Notes / possible disadvantages

• Not every joint requires the same setup: the substrate, joint width and movement must be assessed in advance.
• For critical, highly stressed or unknown substrates, adhesion tests and SIKA pre-treatment recommendations are advisable.

FAQ

Which variant is suitable?
Color and packaging are selected separately. For cartonized goods, – where provided – individual units, half cases and full cases are available.

Does it need to be primed?
This depends on Sikaflex Construction Purform, the substrate and exposure. The above notes and the current SIKA product data sheet are decisive.

Can I use the product outdoors?
Only to the extent that the respective application is approved by SIKA for outdoor use. The substrate, moisture, temperature and exposure are decisive.

What is important for storage and application?
Store packaging closed, dry and within the temperature limits specified by the manufacturer. Observe the product and safety data sheet before application.

Brand note

SIKA®, Sikaflex®, SikaBond®, Sikacryl®, Sikafloor®, Sikagard® and Sikasil® are trademarks of the Sika Group. Technical specifications refer to the SIKA product information available at the time of creation; in case of doubt, the current product data sheet of the manufacturer applies.