DOW CORNING® 781 Acetoxy Silicone Sealant - Bardawil Co
DOW CORNING® 781 Acetoxy Silicone Sealant - Bardawil Co
DOW CORNING® 781 Acetoxy Silicone Sealant - Bardawil Co
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TECHNICAL DATA SHEETProduct Information<strong>DOW</strong> CORNING ® <strong>781</strong><strong>Acetoxy</strong> <strong>Silicone</strong> <strong>Sealant</strong>FEATURES" High strength" Good elasticity" 100% silicone" Solvent-free" <strong>Co</strong>nforms to ISO 11600-F&G-20LM" Resistant to ozone, ultra-violet radiationand temperature extremesHigh modulus acetoxy silicone sealantAPPLICATIONS" <strong>DOW</strong> CORNING <strong>781</strong> <strong>Acetoxy</strong> <strong>Silicone</strong> <strong>Sealant</strong> is a one-part, silicone sealantwhich has good adhesion to a range of non-porous surfaces including glass,aluminum, painted surfaces and composite boards. It offers excellent resistance toaging, shrinkage, cracking and discoloring. It is also approved in certaincountries for use in contact with potable water once cured.TYPICALPROPERTIESSpecification writers: These values are not intended for use in preparingspecifications.Please contact your local Dow <strong>Co</strong>rningsales representative prior to writingspecifications onthis product.Test Method 1 Property Unit ValueCure system<strong>Acetoxy</strong>Application temperature °C°FCTM 97B Specific gravity 1.02CTM 364C Extrusion rate g/minute 200CTM 98B Skin-over time (23°C or 73°F, 50% R.H.) minutes 14CTM 663A Cure rate (23°C or 73°F, 50% R.H.)1 day mm 33 days mm 52mm thickness S2 dumb-bells (ISO 37)CTM 137A E-Modulus 100% MPa 0.40CTM 137A Tensile strength MPa 1.8CTM 137A Elongation at break % 50012x12x50mm size T.A. joint (ISO 8339/DIN2-8339)CTM 677 E-Modulus 100% MPa 0.45CTM 677 E-Modulus 60% MPa 0.35CTM 677 Tensile strength MPa 0.59CTM 677 Elongation at break % 170CTM 99E Hardness (Shore A) 22ISO 9047 Joint movement capability % 201. CTM: <strong>Co</strong>rporate Test Method, copies of CTMs are available on request.DIN: Deutsche Industrie Norm.ISO: International Standardisation Organisation.+5 to +40+41 to +104a.b.e. is an ISO 9001 : 2000 Registered <strong>Co</strong>mpany.a.b.e. <strong>Co</strong>nstruction Chemicals Limited P.O. Box 23053, Isipingo, 4110 7 Wilcox Road, Isipingo, 4133 Tel. (031) 913 5400
TECHNICAL DATA SHEETTECHNICALSPECIFICATIONS ANDSTANDARDS<strong>Co</strong>nforms to ISO 11600-F&G-20LM.Listed by the UK Water FittingsByelaws Scheme for use in contactwith potable water, once cured.HOW TO USESurface preparationEnsure that surfaces to be sealed areclean, dry, sound and free from frost,release agents, old sealants and othercontaminants which could impairadhesion. All surfaces should becleaned and degreased by wiping witha suitable solvent such as<strong>DOW</strong> CORNING ® R40 UniversalCleaner on a clean oil- and lint-freecloth before application of sealant.Note: When usingany solvent, alwaysprovide adequate ventilation.Avoid heat, sparks and open flames.Use solvent resistant gloves. Observeand follow all precautions listed onsolvent container label.MaskingAreas adjacent to the joints should bemasked with tape to preventcontamination of the substrates and toensure a neat sealant line.Maskingtape should be removedimmediately after tooling.PrimingAll joint surfaces other than glass andglazed ceramics should be primed.For specific advice, please refer to the<strong>DOW</strong> CORNING ® Primers' Guide orcontact one of Dow <strong>Co</strong>rningsRegional Service Centers for technicalassistance.<strong>DOW</strong> CORNING <strong>781</strong> <strong>Acetoxy</strong> <strong>Silicone</strong> <strong>Sealant</strong>2Ref. no. 62-0995D-01Back-up materialsWhen back-up material is required, aclosed cell polyethylene backer rod isrecommended. Low tack polyethylenetape should be used in joints tooshallow to allow the use of a backerrod. Back-up materials provide backpressure and prevent three sidedadhesion that limits sealant movementcapability.FinishingThe joint should be tooled within5 minutes of application to ensure goodcontact between the sealant and thesubstrate. Toolingof the sealant alsogives a smooth, professional finish.Clean-upExcess sealant may be cleaned off toolsand non-porous surfaces whilst in anuncured state using<strong>DOW</strong> CORNINGR40 Universal Cleaner. If sealant ismisapplied to porous substrates, itshould be left until it is just cured andthen removed by peeling, cutting orother mechanical means. Care shouldbe taken not to damage plastic orcoated surfaces.JOINT DESIGNThe sealant joint width should bedesigned to accommodate themovement capability of the sealant.When designing joints using<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong><strong>Sealant</strong>, the minimum width should be6mm. For joints between 6-12mmwide, a seal depth of 6mm is required.For joints above 12mm wide, a widthto depth ratio of 2:1 should be used.In situations where fillet joints areneeded, a minimum of 6mm sealantbite to each substrate is recommended.For joint dimensions greater than25mm, please contact one ofDow <strong>Co</strong>rnings Regional ServiceCenters for technical assistance.Figure 1: Deep joint.<strong>DOW</strong> CORNING<strong>781</strong><strong>Silicone</strong> <strong>Sealant</strong>Two non-porous substratesFigure 2: Shallow joint.<strong>DOW</strong> CORNING<strong>781</strong><strong>Silicone</strong> <strong>Sealant</strong>Figure 3: Fillet joint.6mmminimum20 mm12mm10 mmClosed cellpolyethylenebacker foam6 mmLow tack tapeTwo non-porous substrates<strong>DOW</strong> CORNING <strong>781</strong><strong>Silicone</strong> <strong>Sealant</strong>Polyethylene backer rod6mm minimumHANDLING PRECAUTIONSProduct safety information requiredfor safe use is not included.Before handling, read product andsafety data sheets and container labelsfor safe use, physical and health hazardinformation. The material safety datasheet is available on the Dow <strong>Co</strong>rningwebsite at www.dowcorning.com.You can also obtain a copy from yourlocal Dow <strong>Co</strong>rningsales representativeor Distributor or by callingyour localDow <strong>Co</strong>rningGlobal <strong>Co</strong>nnection.a.b.e. is an ISO 9001 : 2000 Registered <strong>Co</strong>mpany.a.b.e. <strong>Co</strong>nstruction Chemicals Limited P.O. Box 23053, Isipingo, 4110 7 Wilcox Road, Isipingo, 4133 Tel. (031) 913 5400
TECHNICAL DATA SHEETUSABLE LIFE ANDSTORAGEWhen stored in cool, dry conditionsbelow 30°C (86°F) in the originalunopened containers,<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong>has a usable life of 27 months from thedate of production.PACKAGING<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong>is supplied in 310ml cartridges packedin boxes of 12.LIMITATIONS<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong>is not recommended for use on poroussubstrates such as concrete, stone,marble or granite. <strong>DOW</strong> CORNING<strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong> should not beused in contact with the edge seal of aninsulated glazing unit.Do not use <strong>DOW</strong> CORNING <strong>781</strong><strong>Silicone</strong> <strong>Sealant</strong> on bituminoussubstrates, substrates based on naturalrubber, choloroprene or EPDM, or onbuildingmaterials and flexible plasticswhich might bleed oils, plasticizers, orsolvents. Do not use <strong>DOW</strong> CORNING<strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong> in a totallyconfined space because the sealantrequires atmospheric moisture to cure.Because acetic acid is released duringcuring, it can corrode mirror silver andsensitive metals such as copper, brassand lead. <strong>DOW</strong> CORNING ® 817Mirror Adhesive should be used forthis application. <strong>DOW</strong> CORNING <strong>781</strong><strong>Silicone</strong> <strong>Sealant</strong> is not recommendedfor use on submerged joints, or injoints where physical abuse or abrasionis likely to occur.<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong>is not suitable for food contactapplications. However, it has beenlisted by the UK Water FittingsByelaws Scheme for use in contactwith potable water, once cured.<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong>has not been designed for use as anaquarium sealant.<strong>DOW</strong> CORNING <strong>781</strong> <strong>Silicone</strong> <strong>Sealant</strong>is not recommended for structuralglazing or insulated glazingapplications.This product is neither tested norrepresented as suitable for medicalor pharmaceutical uses.HEALTH ANDENVIRONMENTALINFORMATIONTo support Customers in their productsafety needs, Dow <strong>Co</strong>rninghas anextensive Product Stewardshiporganization and a team of ProductSafety and Regulatory <strong>Co</strong>mpliance(PS&RC) specialists available in eacharea.For further information, please see ourwebsite, www.dowcorning.com orconsult your local Dow <strong>Co</strong>rningrepresentative.LIMITED WARRANTYINFORMATION - PLEASEREAD CAREFULLYThe information contained herein isoffered in good faith and is believedto be accurate. However, becauseconditions and methods of use of ourproducts are beyond our control, thisinformation should not be used insubstitution for customers' tests toensure that Dow <strong>Co</strong>rning's products aresafe, effective, and fully satisfactoryfor the intended end use. Suggestionsof use shall not be taken asinducements to infringe any patent.Dow <strong>Co</strong>rning's sole warranty is that theproduct will meet the Dow <strong>Co</strong>rningsales specifications in effect at the timeof shipment.Your exclusive remedy for breach ofsuch warranty is limited to refund ofpurchase price or replacement of anyproduct shown to be other than aswarranted.<strong>DOW</strong> CORNING SPECIFICALLYDISCLAIMS ANY OTHEREXPRESS OR IMPLIEDWARRANTY OF FITNESS FORA PARTICULAR PURPOSE ORMERCHANTABILITY.<strong>DOW</strong> CORNING DISCLAIMSLIABILITY FOR ANYINCIDENTALORCONSEQUENTIALDAMAGES.We help you invent the future."www.dowcorning.com<strong>DOW</strong> CORNING <strong>781</strong> <strong>Acetoxy</strong> <strong>Silicone</strong> <strong>Sealant</strong>3Ref. no. 62-0995D-01<strong>DOW</strong> CORNING <strong>781</strong> <strong>Acetoxy</strong> <strong>Silicone</strong> <strong>Sealant</strong>We help you invent the future. is a trademark of Dow <strong>Co</strong>rning<strong>Co</strong>rporation.4 14/12/2004 <strong>DOW</strong> CORNING is a registered trademark of Dow <strong>Co</strong>rning <strong>Co</strong>rporation.Ref. no. 62-0995D-01©1999-2004 Dow <strong>Co</strong>rning<strong>Co</strong>rporation. All rights reserved.a.b.e. is an ISO 9001 : 2000 Registered <strong>Co</strong>mpany.a.b.e. <strong>Co</strong>nstruction Chemicals Limited P.O. Box 23053, Isipingo, 4110 7 Wilcox Road, Isipingo, 4133 Tel. (031) 913 5400
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