FulaFlex™ 620

• ISO 11600 Type F, Class 25, sub-class LM
• Meets the criteria of a sealant for use in AS3740-2010 (Waterproofing of Domestic Wet Areas) waterproofing applications
• Isocyanate and solvent free
• Highly flexible - ± 25% of original joint width.
• Excellent resistance to weathering and UV radiation, resists yellowing
• Mould Resistant – Will not support fungal growth
• Excellent long term chemical resistance to seawater, caustic solutions and cleaning agents
• Short term chemical resistance to petrol, grease and mineral oil
• No bubble formation when curing
• Paintable with high build, flexible emulsion coatings
• Does not sag or slump in joints up to 35mm
• Strong adhesion
• Sag Resistant

Uses:

• Sealing expansion and control joints in tiling, walls, roofs, wall, door and window frame perimeters, cladding and brickwork.
• In applications where a level of chemical resistance is required.
• In seals where acoustic properties is required.
• As a waterproofing perimeter fillet beneath waterproofing membranes (refer to H.B. Fuller technical department for specific membrane recommendations) including those required to satisfy AS3740-2010
• As a sealant in fibre cement façade systems (pre-testing recommended –refer to H.B. Fuller sales representative or technical department)

Surface Preparation:

All surfaces must be clean, dry, sound and free of dust, oil, old sealant or other contamination. Lightly contaminated surfaces should be wiped with Isopropyl Alcohol (IPA) using the 2-rag wipe method. Apply IPA to a clean lint-free cloth and wipe onto the surface to be cleaned to solubilize and remove the majority of the contaminant. A clean dry cloth should then be applied to remove remaining contamination and dry the surface. Ensure wet cleaner is not allowed to dry on surface. For more heavily contaminated surfaces or where the IPA does not remove the contaminant, a generic wax and grease remover should be applied using the same 2-rag wipe method. Once this has been completed the surface should be given a final clean with IPA using the 2-rag wipe method to ensure the surface is ad- equately prepared. Adhesion to metals and some surface finishes can be further improved by light abrasion prior to cleaning with IPA using the 2 rag-wipe method. Manufacturers of plastics should be consulted about suitable cleaning solvents. Adhesion to plastics should be pre-tested. Mask either side of joint to produce a neat finish. Use a suitable sized foam backing rod or polyethylene bond breaker tape to prevent three sided joint contact impeding the free and even deformation of the sealant in a cyclic joint. Open-cell polyurethane foam is recommended. Use a size 25% wider than the joint width that will compress when inserted into the joint.

Product Application:
ut tip off cartridge. Angle cut nozzle to desired size. Screw nozzle onto cartridge. Apply sealant in a steady, continuous flow by pushing the sealant ahead of the nozzle so that it completely fills the joint and is in contact with both sides. Immediately after application, tool the sealant using a spatula. A dilute soap/water de- tergent solution may be used to tool FulaFlexTM 620, although the solution should be pre-tested to confirm it does not affect the sealant in any way, as this can compromise long-term durability. Avoid contact with alcohol or other solvent cleaners during cure. Remember to remove the masking tape before the sealant skins.

Painting:
lexible, acrylic-based emulsion coatings are best over FulaFlexTM 620. Less flexible interior coatings are likely to crack due to their inflexibility. Oil based coatings and coatings containing a solvent are likely to remain tacky for an extended period when used over FulaFlexTM 620.

Chemical Resistance:
ong-term chemical resistance to fresh water, salt water, limewater, caustic solutions and cleaning agents. Short-term chemical resistance to petrol, grease and mineral oil. Not resistant to organic acids, concentrated mineral acids or solvents.

Clean Up:
est results are obtained by masking prior to sealing to avoid the necessity for clean up. However, if sealant is applied to areas where it is unwanted, clean up uncured sealant using toluene*, xylene*, methyl ethyl ketone*, acetone* or mineral turpen- tine* and a cloth. Take precautions to avoid staining substrates when using solvents. Cured sealant should be removed by abrasion or trimmed with a sharp knife. Do not undercut seal.

Joint Design:
A good joint design is imperative if a sound, durable seal is to be achieved In general, joints should be designed to be at least 4 times as wide as the anticipated movement. Joint width and depth should not be less than 6 mm and depth should never exceed width.

Limitations:

• Avoid exposure to high levels of chlorine
• Not recommended for use in joints deeper than 20 mm
• Avoid contact with alcohol and other solvent cleaners during cure phase
• Pre-testing is required on marble or other highly porous stone - finish may be affected
• Solvent-based coatings may remain tacky
• Do not use on bituminous surfaces
• Do not use on materials that bleed oil and plasticisers or solvents, as this will affect adhesion (e.g. most rubbers)
• Not a fire rated or glazing sealant. Not suitable for glazing use with glass, acrylic or polycarbonate sheets
• Not suitable for floor applications or foot traffic areas
• Not suitable for use in roofing lap joint applications where the sealant is feath- ered down to zero application weight – for such applications consider the use of silicone.
• Not suitable for swimming pools or hot tubs

Coverage:

Approximate linear meters coverage of FulaFlexTM 620 sealant as per table:
 

H.B. Fuller FulaFlexTM 620 is available in the following package sizes and colors:
Packaging

• 10 fl oz Cartridge
• 600 mL Sausage