Product Information Silicone Sealants Dow …

1 Product InformationSiliconeSealantsFEATURES Excellent performance even inbuilding joints that experienceextreme movement Low VOC content Easy application over a widetemperature range Extension/compression capabilityof +100/-50 percentCOMPOSITION Ultra-low-modulus, one-part,neutral-cure Silicone sealantDow corning 790 Silicone Building SealantUltra-low-modulus sealant for new and remedial constructionjoint sealing applicationsAPPLICATIONSDow corning 790 Silicone Building sealant offers outstanding unprimed adhesion tomasonry and is particularly effective for sealing expansion and control joints, precastconcrete panel joints, Exterior Insulation and Finish Systems (EIFS) joints, curtain-wall joints, mullion joints, stone pavers and many other construction joints.

2 Thesealant forms a durable, flexible, watertight bond with most building materials in anycombination: stone, masonry, ceramics, granite, wood, steel, aluminum and PROPERTIESS pecification Writers: Please contact your local Dow corning Sales Application Engineeror Dow corning Customer Service before writing specifications on this SuppliedColors11 colors,custom colorsalso availableASTM C 679 Tack-Free Time, 50% RHhours1 Curing Time, 50% RH, at 25 C (77 F)days7-14 Full Adhesiondays14-21 ASTM D 2202 Flow, Sag or Slump,in 3-inch (76-mm)-wide jointNoneCTM1 98 BWorking Timeminutes10-20 VOC Content2 (11 colors)g/L39 VOC Content2 (custom colors)g/L43As Cured After 7 days at 25 C (77 F)

3 And 50% RHASTM C 661 Durometer Hardness, Shore Apoints15 ASTM D 412 Ultimate Tensile Strength,maximum elongationpsi (kg/mm2)100 ( )ASTM D 412 Elongation, maximumpercent1600 ASTM C 794 Peel Strengthlb/in (kg/cm)25 ( )ASTM C 1135 Tensile Adhesion,at 25% extensionpsi (kg/mm2)15 ( )at 50% extensionpsi (kg/mm2)20 ( )ASTM C 1135 Weathering, after 22,400 hours inQUV Weatherometer ASTM G 53at 25% extensionpsi (kg/mm2)30 ( )at 50% extensionpsi (kg/mm2)40 ( )ASTM C 719 Joint Movement CapabilitiesExtensionpercent+100 Compressionpercent-50 ASTM C 1248 Staining, after 14 days of 50% com-pression, at 70 C (158 F) on con-crete, granite, limestone and brickNoneUL 263,ASTM E 119 Fire Endurancehours 21 CTMs (Corporate Test Methods) correspond to standard ASTM tests in most instances.

4 Copies of CTMs areavailable upon on South Coast Air Quality Management District of California. Maximum VOC is listed both inclusive andexclusive of water and exempt compounds. For a VOC data sheet for a specific sealant color, please send your requestto corning 790 Silicone BuildingSealant is a one-part Silicone formu-lation that cures in the presence ofatmospheric moisture to produce adurable, fire-resistant, flexible andultra-low-modulus Silicone rubberbuilding joint of its ultra-low modulus, highelongation, compression/extensionrecovery, and its ability to formstrong, durable bonds with mostbuilding materials, this sealantprovides excellent performance, evenin building joints that experienceextreme movement.

5 It is recom-mended as a remedial sealant forjoints in which other materials havebadly weathered or failed due toexcessive movement. The high jointmovement ability of Dow corning 790 Silicone Building sealant allows therepair of failed joints, generally withno joint widening saving time andlabor corning 790 Silicone BuildingSealant does not contain PCBs orasbestos. (See Typical Properties).Dow corning 790 Silicone BuildingSealant is an ultra-low-modulusmaterial; therefore, joint movementplaces only a low stress on the sealant /substrate bond line. The material alsoshows good recovery from extensionand compression.

6 It is this uniqueblend of properties that enables thissealant to perform well, even in jointsthat experience movement corning 790 Silicone BuildingSealant is available in 11 colors: black,precast white, gray, natural stone,bronze, adobe tan, blue spruce, rusticbrick, sandstone, charcoal and dustyrose. Custom colors are available corning 790 Silicone BuildingSealant is USDA-authorized in sixcolors for sealing non-food contactareas in USDA-regulated corning 790 Silicone BuildingSealant has been tested by UL andmeets the two-hour fire resistanceratings with or without the use ofmineral wool as a backer (in a jointconfiguration sealing system without aprotective cover plate).

7 Dow Corning790 Silicone Building sealant alsoholds up when exposed to a high-pressure water force without aprotective cover corning 790 Silicone BuildingSealant exceeds the durability require-ments of: ASTM Specification C 920, TypeS, Grade NS, Class 100/50, Use T,NT, M, G, A and O Federal Specification TT-S-001543 Afor Silicone building Sealants Federal Specification TT-S-00230 Cfor one-component building Sealants Fire Tests of Building Constructionand Materials, UL 263 (ASTM E 119) Canadian Specification from an independent test lab andSWRI validation is available fromDow corning and the TO USEP lease consult the Dow CorningAmericas Technical Manual, Form , for detailed Information onstate-of-the-art application methodsand joint design.

8 Please contact yourlocal Dow corning Sales ApplicationEngineer for specific RatingIn a properly designed joint,Dow corning 790 Silicone BuildingSealant can be applied without a coverplate and with or without a mineralwool backer material, yet still be fireresistant (see Table I and Figure 1).See UL Fire Resistance DirectoryDesign U 900 all concrete, masonry and stonejoints of all contaminants and substrates should be cleanedwhere necessary by grinding, sawcutting, blast cleaning (sand or water),mechanical abrading or a combinationof these methods as required to providea sound, clean, dry surface for Dust, loose particles, etc.

9 ,should be blown out of joints with dry,oil-free compressed air or be and glass surfaces adjacent tomasonry should be cleaned by wipingwith an oil-free absorbent clothsaturated with solvent such as xyleneor toluene. Do not use alcohols as theyinhibit the should be applied beforeinstalling the backer rod. Applying abead of Silicone sealant to the sub-strate material to test adhesion prior togeneral use is always is not required with concrete,glass, granite and most poroussurfaces. Most aluminum substrates(painted, mill, anodized, etc.) andother nonporous surfaces require useof a primer. Consult Dow corning forpriming recommendations on corning s recommendations for removal ofexisting Sealants , substrate cleaning, joint preparationand installation of Dow corning brand siliconebuilding Sealants are not intended and may not beappropriate for remedial work involving existingsealants and/or joints containing PCBs or otherpotentially hazardous substances.

10 If you know orsuspect that the existing Sealants and/or joints containPCBs or other hazardous substances, contact aknowledgeable authority on appropriate removal,handling and disposal the solvent manufacturer s safe handlingrecommendations and local, state and federalregulations regarding solvent A UNDERWRITERS LABORATORIES TREATMENT MATERIALSFIRE RESISTANCE CLASSIFICATIONDESIGN NO. UL FIRE RESISTANCE all cases, a sample should be testedand/or test joints should be installedon the adjacent to joints may bemasked to ensure neat sealant not allow masking tape to touchclean surfaces to which the siliconesealant is to adhere.