Sikaflex Pro from Sika Australia, Nitoseal PU250 from Parchem, Seal N Flex from Bostik Australia and Fulaflex 550PU LM from HB Fuller are flexible, durable, weather resistant low modulus, one part, elastomeric polyurethane joint sealants which all have excellent adhesion to a wide range of substrates and in some cases don’t require priming. These products cure using the moisture in the atmosphere.
Sika Pro is easily applied using a barrel gun or caulking gun and finish off nicely. Battery powered caulking and barrel guns are available for larger applications. Sika Flex Pro, Seal and Flex, Nitoseal PU 250 and Fulaflex 550 PU are one part or component product, so no mixing or mess.
Common uses include Construction joints between concrete precast panels and slabs, external wall and cladding joints, curtain walling, sealing around windows and door frames, retaining walls, brick work and block work.
When filling an expansion joint, backing rod is normally used. The two main reasons are to get the right shape or geometry and the other is to use less product. Backing rod is split into two materials, open cell polyurethane foam and closed cell polyolefin foam. These are available in round, square and rectangular shapes. We recommend round be used.
Each supplier has a number of colours, please refer to the colour Sika, Bostik, HB Fuller and Parchem colour charts
Cleaning should be done before the product is cured. Remove the bulk of the product using a scraper and then clean the scraper with the recommended cleaner. Cleaning your hands and skin will require a different product to your tools. Sika recommend Colma Cleaner for your tools and Sikaflex hand cleaner for your skin. Parchem you should use Fosroc solvent 10 for your tools, HB Fuller recommend Toluene, xylene, methyl ethyl ketone, acetone or mineral turpentine and a cloth and Bostik recommend their handy wipes.