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Dow Corning 999 Silicone Building and Glazing …

1. PRODUCT NAMEDow Corning 999-A Silicone Building & Glazing Sealant2. MANUFACTURERDow Corning CorporationMidland, MI 48686-0994 Phone: (517) 496-6000 FAX:(517) 496-45863. PRODUCT DESCRIPTIONDow Corning 999-A SiliconeBuilding & Glazing Sealant is an easilyapplied, one-part sealant that cures inthe presence of atmospheric moistureto produce a durable and flexibleglazing and curtainwall Uses: Dow Corning 999-ASilicone Building & Glazing Sealant isintended for Building constructionapplications and is particularly effectivefor Glazing butt and lap shear joints andsealing curtainwall projections andother glass, plastic and metalassemblies. It is also appropriate forgeneral construction may be factory applied as a primaryseal to glass, plastic and is usually required on plasticand metal : Dow Corning 999-ASilicone Building & Glazing Sealant isnot recommended for use in applica-tions involving: Structural Silicone Glazing Joints where physical abuse orabrasion is likely to be encountered Prolonged water immersion Porous surfaces, such as masonry Building materials that might bleedoils, plasticizers or solvents materialssuch as impregnated wood, oil-basedcaulks, green or partially vulcanizedrubber gaskets or tapesTYPICAL PROPERTIEST hese values are not intended for use in preparing SuppliedASTM C 679 Tack-Free Time at 25 C (77 F), 50% RH, minutes.

Masking: Areas adjacent to joints should be masked to ensure neat sealant lines. Do not allow masking tape to touch clean surfaces to which the silicone sealant will adhere.

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Transcription of Dow Corning 999 Silicone Building and Glazing …

1 1. PRODUCT NAMEDow Corning 999-A Silicone Building & Glazing Sealant2. MANUFACTURERDow Corning CorporationMidland, MI 48686-0994 Phone: (517) 496-6000 FAX:(517) 496-45863. PRODUCT DESCRIPTIONDow Corning 999-A SiliconeBuilding & Glazing Sealant is an easilyapplied, one-part sealant that cures inthe presence of atmospheric moistureto produce a durable and flexibleglazing and curtainwall Uses: Dow Corning 999-ASilicone Building & Glazing Sealant isintended for Building constructionapplications and is particularly effectivefor Glazing butt and lap shear joints andsealing curtainwall projections andother glass, plastic and metalassemblies. It is also appropriate forgeneral construction may be factory applied as a primaryseal to glass, plastic and is usually required on plasticand metal : Dow Corning 999-ASilicone Building & Glazing Sealant isnot recommended for use in applica-tions involving: Structural Silicone Glazing Joints where physical abuse orabrasion is likely to be encountered Prolonged water immersion Porous surfaces, such as masonry Building materials that might bleedoils, plasticizers or solvents materialssuch as impregnated wood, oil-basedcaulks, green or partially vulcanizedrubber gaskets or tapesTYPICAL PROPERTIEST hese values are not intended for use in preparing SuppliedASTM C 679 Tack-Free Time at 25 C (77 F), 50% RH, minutes.

2 10-20 Tooling Time, minutes .. 5-10 ASTM C 639 Flow, sag or slump .. NilColor .. Clear, white, bronze, light bronze, black, aluminum and custom colorsAs Cured 7 days at 25 C (77 F) and 50% RHASTM D 2240 Durometer Hardness, Shore A, points .. 25 ASTM D 412 Ultimate Tensile Strength, psi (MPa) .. 325 ( )ASTM D 624 Tear Strength, ppi (kN/m) .. 25 ( )ASTM C 794 Peel Strength, pli (kN/m) .. 20 ( )ASTM C 603 Extrusion Rate, g/min .. 350 Specification Writers: Please obtain a copy of the Dow Corning Sales Specification for this product anduse it as a basis for your specifications. It may be obtained from any Dow Corning Sales Office, or fromDow Corning Customer Service in Midland, MI. Call Corning 999-ASilicone Building & Glazing Sealant Totally confined spaces, because thesealant requires atmospheric moisturefor cure Surfaces sensitive to corrosion byacetic acid vapors (a byproduct ofsealant cure) Surfaces that will be painted (paintwill not stretch with the extensions ofthe sealant and may crack and peel);complete all painting prior to usingsealant Bonding to secondary seal of insulat-ing glass units sealed with two-partsilicone sealants Auto trim Appliance trim ( , adhesive trim)Black Dow Corning 999-A SiliconeBuilding & Glazing Sealant isrecommended for glass-to-glass buttjoints because butt joints sealed withclear sealant may contain smallamounts of air that are trapped duringAV00915the packaging and/or application of thesealant.

3 Appearance standards shouldbe established and agreed upon priorto sealant product is neither tested norrepresented as suitable for medical orpharmaceutical and Materials:Dow Corning 999-A Silicone Building & Glazing Sealant is a Silicone materialthat is chemically stable and showslittle change in physical properties Corning 999-A SiliconeBuilding & Glazing Sealant is suppliedas a one-part, ready-to-use material,which has a toothpaste-like consis-tency. It can be used over a widetemperature range of -37 to 60 C (-35to 140 F), allowing the sealants to beapplied easily in any kind of : When applying Dow Corning999-A Silicone Building & GlazingSealant to nonreflective glass surfaces,priming is not required. Refer to theSurface Preparation Guide, No. 61-182,for more specific recommendations. Incases where doubt exists, a sampleshould be tested before full-scale : Dow Corning 999-ASilicone Building & Glazing Sealant ispackaged in oz (305-mL)disposable cartridges, which fit ordinarycaulking guns, and (17-L) bulkpails.

4 It can be dispensed by many air-operated guns and most types of bulkdispensing : Dow Corning 999-A SiliconeBuilding & Glazing Sealant is availablein six standard colors: clear, white,bronze, light bronze, black andaluminum. In addition, custom colorscan be matched to TECHNICAL DATADow Corning 999-A SiliconeBuilding & Glazing Sealant is resistantto sunlight, rain, sleet, snow, ultravioletradiation, ozone and temperatureextremes. Its unique weatherabilityenables it to retain its design propertieseven after years of exposure. Jointperformance does not change signifi-cantly with aging or exposure toweather. Seals remain watertight sealant will not harden incold to -60 C (-76 F) or soften withheat to 177 C (350 F) with intermittenttemperatures up to 200 C (392 F). Itwill not become brittle, tear or crack; Silicone sealant stays Corning 999-A SiliconeBuilding & Glazing Sealant iscompatible with most laminated glass,acrylic and polycarbonate glazingsheets, and all one-part Dow Corning brand Silicone construction , adhesion and compatibilitymust be evaluated in each instanceprior to sealant use and one sealantshould be applied only after the otherhas fully Standards:Dow Corning 999-A Silicone Building & Glazing Sealant meets thequalifications of: Federal Specification TT-S-001543,Class A Federal Specification TT-S-00230,Class A FDA Regulation No.

5 21 (subject to end usecompliance with any applicable totalextractives limitations) some customcolors may not meet this regulation;contact Dow Corning for informationregarding custom colors Canadian Specification ASTM C 920 specification Chemically acceptable forapplication to surfaces and equipmentthat may contact edible products inestablishments operating under theUSDA federal meat and poultryinspection program5. INSTALLATIONJ oint Design: A thin bead of sealantwill accommodate more movementthan a thick Corning 999-A SiliconeBuilding & Glazing Sealant should beno thicker than 1/2 inch (13 mm) andno thinner than 1/4 inch (6 mm). Ideally,the ratio of joint width to sealant depthshould be about 2:1 (see Figure 3).Polyurethane or polyethylene foamrod is the recommended backupmaterial for deep joints; polyethylenetape is recommended for joints tooshallow to allow foam rod. Thesematerials permit application of a thinbead and act as bond breakers thatallow the Silicone sealant to stretchfreely with the joint rabbets and joints should bedesigned to allow installation andretention of the bond-breaking backupmaterial during the installation andcuring of Dow Corning 999-A SiliconeBuilding & Glazing shear joints should have a beadwidth that is equal to, or greater than,the total anticipated Dimensions: Small curtainwallpanels and lites should allow aLinear Feet Per Gallon of Dow Corning 999-A SiliconeBuilding & Glazing Sealant for Various Joint SizesWidth, Inches1/81/43/81/25/83/411/8123261641130 72462051543/16 4112752051641371031/4 307205154123103773/8 1371038268511/2 10377625139 Depth, InchesTable I: Estimating Requirementsminimum width of 1/4 inch (6 mm) forthe sealant bead.

6 Larger panels andlites, or those in which a great deal ofmovement is expected, should allow aminimum width of four times theexpected movement. Glazing of plasticlites and panels fabricated from plasticrequire larger than usual jointdimensions due to the plastic s highercoefficient of thermal expansion. Forthese applications, Dow Corning 795 Silicone Building Sealant orDow Corning 791 Silicone PerimeterSealant is Work: Bonding surfaceson both new and remedial jobs must besound, dry, and free of all foreign matterand contaminants such as grease, oil,dust, water, soap residue, frost, surfacedirt and old sealants or glazingcompounds and protective Corning 999-A SiliconeBuilding & Glazing Sealant will adhereto cured Silicone sealant with a prepar-atory solvent wipe to removeaccumulated the surfaces using a clean, oil-free rag saturated with solventsuch as xylol, toluol or methyl metal, glass and plasticsurfaces by mechanical or solventprocedures.

7 Do not clean surfaces withsoap, detergent or any water-basedcleaner. Wipe solvents on with a clean,oil- and lint-free, absorbent solvent before it dries, using aclean, dry not flood surfaces with moresolvent than necessary. Make sure thatapparently clean surfaces are notcovered with a thin film of :When using Dow Corning999-A Silicone Building & GlazingSealant on nonreflective glass surfaces,priming is not usually required. Placinga bead of the Silicone sealant on thesubstrate material to test adhesionprior to general job use is 1: Cap Bead GlazingFigure 2: Butt Joint GlazingFigure 3: Recommended JointDesignSILICONEBUILDING& GLAZINGSEALANT 3/8 "TYPICALFIGURE 2: BUTT JOINT GLAZINGSILICONESEALANTBACKERRODGOOD JOINT DESIGNRATIO OF A:B SHOULD BEABOUT 2:1AB 1/4 " 1/4 "NONMOVING FILLET JOINTSEALING NONMOVING AND MOVINGTRIANGULAR FILLET JOINTSA 1/4 " 1/4 "BOND BREAKER TAPEMOVING FILLET JOINT JOINT MOVEMENT x 100A = JOINT MOVEMENT CAPABILITY IN %1 Always follow solvent manufacturer's recommended safehandling information and applicable federal, state and 4: Sealing Nonmoving FilletJointsFigure 5: Sealing Moving Fillet JointsSEALANTCAP BEADSCOMPRESSIONGASKETM asking: Areas adjacent to jointsshould be masked to ensure neat sealantlines.

8 Do not allow masking tape totouch clean surfaces to which thesilicone sealant will adhere. Toolingshould be completed in one continuousstroke immediately after sealantapplication and before a skin should be removedimmediately after tooling and before askin forms (5-10 minutes).Method of Application: Dow Corningacetoxy sealants can be applied directlyfrom the caulking cartridge with eitheran air-operated or hand-operatedcartridge gun. Do not break the cartridgeseal until just before backup material or joint filler,setting blocks, spacer shims and tapesas specified. Apply the sealant in acontinuous operation using a positivepressure adequate to properly fill andseal the : Tooling is recommendedand, if possible, should be completedin one continuous stroke. Tool or strikethe sealant with light pressure to spreadthe material against the backup materialand the joint surfaces. A tool with aconcave profile is recommended tokeep the sealant within the Glazing , tool the sealant ap-plied at the sill so that precipitation andcleaning solutions will not the joint within 10 minutes ofapplication.

9 Remove masking tapebefore a surface skin begins to a surface skin begins to form, itwill be torn off when the tape isremoved, leaving a rough applying the sealant and a skinhas formed, do not disturb the joint for48 : Excess sealant should becleaned off tools and nonporoussurfaces while it is in the uncured state,by using a solvent such as xylol, toluolor methyl ethyl sealant accidentally contactadjacent porous surfaces, the excesssealant should be allowed to progressthrough the initial cure or set-up. Itshould then be removed by abrasion orother mechanical Storage: After use, simplyremove the excess material from thetip. To reopen the cartridge, removethe cured plug from the Handling Information:PRODUCT SAFETY INFORMATIONREQUIRED FOR SAFE USE IS NOTINCLUDED. BEFORE HANDLING,READ PRODUCT AND MATERIALSAFETY DATA SHEETS AND CON-TAINER LABELS FOR SAFE USE,PHYSICAL AND HEALTH HAZARDINFORMATION.

10 THE MATERIALSAFETY DATA SHEET IS AVAILABLEFROM YOUR DOW CORNINGREPRESENTATIVE, OR DISTRIBUTOR,OR BY WRITING TO DOW CORNINGCUSTOMER SERVICE, OR BY CALL-ING AVAILABILITY AND COSTA vailability: Dow Corning 999-ASilicone Building & Glazing Sealant ismarketed throughout the United States,Canada, Europe, Latin America,Australia and Japan through distrib-utors and Building supply WARRANTYL imited Weatherseal Warranty:Dow Corning Corporation producesand sells a full line of siliconeconstruction sealants and products offer a variety of physicalcharacteristics and adhesion Corning 999-A Silicone Building & Glazing Sealant is part of that lineand, when used with compatiblesubstrates and when applied within thestated shelf life and according tomanufacturer s recommendationsfor application and joint design,Dow Corning warrants that this sealantwill perform as a watertight weathersealfor a period of 10 years from the date ofpurchase.


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