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technical data sheet<strong>SEAL</strong> ‘N’ <strong>FLEX</strong> <strong>2638</strong>One-Component Polyurethane Construction Grade SealantDESCRIPTIONModulus at 100% Elongation0.4MPa approx.<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> is a single part qualitypolyurethane based sealant which cures by reaction withatmospheric moisture. When cured it will form a tough,flexible seal capable cyclic expansion and compressionmovement of 50% (± 25%) of the original joint width.<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> is resistant to normalweathering conditions such as rain, sunlight, snow, sleet,ultra-violet radiation, ozone, atmospheric contaminationand pollution. Its excellent durability enables it to retain itsoriginal properties after years of exposure.USES• In-situ concrete• Precast and tilt up panels• Brick & blockwork• Plasterboard• Aluminum windows• Granite, sandstone and marble• GRC, fiberglass & specialty panel systems• Metal curtain wallFEATURES• Low modulus 50% (± 25%)• Excellent durability• One component, no mixing required• Paintable (refer limitations)TYPICAL PROPERTIESTensile strength at Break 0.7 N/mm 2Elongation at break >350%Application TemperatureTemperature resistanceFull cure5 o C to 35 o C-30 o C to +80 o C7 days on porous substratesAPPLICATION INSTRUCTIONSPREPARATIONClean all surfaces by removing foreign matter andcontaminants such as oil, dust, grease, frost, water,surface dirt, old sealants and any protective coating. Dustand loose particles should be blown out of joints with oilfree compressed air or vacuum cleaned. Non-poroussurfaces may require preparation / priming, refer primerselection section. Cleaning solvents should not beallowed to air dry or evaporate without being wiped with aclean, dry cloth.PRIMINGSeal ‘N’ Flex <strong>2638</strong> will adhere without priming to manysurfaces such as concrete, wood, stone, enameledsubstrates, GRP, anodized aluminium etc.On certain surfaces, however, the use of a primer may benecessary before sealant application, e.g. absorbentsurfaces such as cellular concrete, mild steel anduntreated aluminium. In these cases advice on primingshould be sought from your local BOSTIK office.AppearanceCure MethodTack free timeNon sag smooth thixotropicpasteMoisture Curing60-120 minutesAPPLICATION<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> should be dispensed from thesausage sachet by means of a hand or air operatedcaulking gun designed for such application (availablefrom <strong>Bostik</strong>).Rate of cure in mm/24h 3Hardness Shore AChemical resistance40 approx.Resistant to dilute acids, alkalis& some solventsFor sausages, a barrel gun is required. Clip the end of thesausage and place in barrel gun. Screw end cap andnozzle on to barrel gun. Using the trigger extrude thesealant, to stop depress using the catch plate. Apply Seal‘N’ Flex <strong>2638</strong> in a continuous bead using enoughpressure to properly fill the joint.<strong>SEAL</strong> ‘N’ <strong>FLEX</strong> <strong>2638</strong> PAGE 1 of 2.
JOINT <strong>SEAL</strong>ING HINTS• Prime prior to the installation of the backing rod• Always use backing rod for correct sealantgeometry• Ensure maximum adhesion to bond face and depthto width ratio of 1:1 to 12mm and 2:1 from 12mm to20mm.MIXINGNo mixing is required for <strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong>.Simply use directly from sausage.CLEAN-UPClean up uncured material and equipment immediatelyafter use using <strong>Bostik</strong> 9907 solvent. Do not use solventson skins.PACKAGING<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> is supplied in 600ml sausages.Available in grey, white and black colour.COVERAGEPAINTABILITY<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> is paintable after fully cured.Coatings containing solvents such as enamels, oil basedor other coatings may cause the surface of the sealant toreact creating a tacky surface. A field test isrecommended to ensure compatibility of the coating with<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong>.HEALTH AND SAFETYOn contact, uncured sealant causes irritation. Gloves andprotective goggles must be worn during application anduse.• Avoid contact with skin, eyes and avoid breathing invapour.• Wear protective gloves when mixing or using.• If poisoning occurs, contact a doctor.• If swallowed, do not induce vomiting. Give a glass ofwater.• If skin contact occurs, remove contaminatedclothing and wash skin thoroughly for a minimum of15 minutes and see a doctor.• For more detailed information refer to MaterialSafety Data Sheet.The coverage below is the approximate linear metrecoverage per pack size.SIZE6mmx6mm10mmx10mm20mmx10mm600ml (ssg) 16.7 6 3Calculation formulaW x D X L = Litres1000W = Width(mm) D = Depth(mm) L= Length(metres)STORAGEWhen stored between 5 o C and 25 o C <strong>Bostik</strong> Seal ‘N’ Flex<strong>2638</strong> has a shelf life of 12 months from date ofmanufacture. All materials should be stored undercover in a manner that will prevent damage preferably onpallets.PRECAUTION<strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> should not be:• Used in chlorinated water such as swimming pools,spas etc.• Do not apply <strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong> to anymaterial containing bitumen. Do not allow bitumento contact <strong>Bostik</strong> Seal ‘N’ Flex <strong>2638</strong>.• Constantly immersed in salt water.• Used for structural glazing applications.• Applied to cement based substrates within 28 days.• Used in trafficable joints.• Applied at temperatures below 5 o C.Disclaimer: The information detailed in this data sheet is liable tomodification from time to time in the light of experience and normalproduct application, and therefore customers are advised to check with<strong>Bostik</strong> Holding <strong>Hong</strong> <strong>Kong</strong> <strong>Limited</strong>, quoting the reference number thatthey possess the latest issue. The representations and recommendationsregarding the products are based on tests which we believe to be reliable.However, no guarantee of their accuracy can be made because of thegreat range of field conditions and variations encountered in raw materials,manufacturing equipment and methods. Thus, the products are sold witha limited warranty only, and on the condition that purchasers will maketheir own tests to determine the suitability of the product for their particularpurposes. Under no circumstances will <strong>Bostik</strong> Holding <strong>Hong</strong> <strong>Kong</strong> <strong>Limited</strong>be liable to anyone except for replacement of the products or refund of thepurchase price.<strong>Bostik</strong> Holding <strong>Hong</strong> <strong>Kong</strong> <strong>Limited</strong>6/F Victoria Centre15 Watson Road<strong>Hong</strong> <strong>Kong</strong>Tel: (852) 2807 9400Fax: (852) 2510 8380JAN/07/A<strong>SEAL</strong> ‘N’ <strong>FLEX</strong> <strong>2638</strong> PAGE 2 of 2.
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