Dow Corning® 793T Silicone Glazing Sealant - C. …

1 Product Information Dow corning 793t Silicone Glazing Sealant FEATURES One-part translucent, Silicone rubber x Ease of application-ready to use as supplied; no catalyzing or mixing APPLICATIONS. required. Can be extruded in place x Dow corning 793t Silicone Glazing Sealant meets or exceeds the test from cartridges using ordinary requirements of: ASTM Specification C-920 Type S, Grade NS, Class 25, caulking guns. Use NT, G, A. x All-Temperature gunability consistency is virtually unchanged TYPICAL PROPERTIES. from -37 C to 71 C permitting the Specification Writers: These values are not intended for use in preparing Sealant to be applied in any season specifications.

2 Please contact your local Dow corning sales office or your Global to dry, frost-free surfaces. Dow corning Connection before writing specifications on this product. x Good weatherability like other Dow corning Silicone building Test Property Unit Result sealants, it is virtually unaffected As supplied Color translucent by sunlight, rain, snow, ozone or MIL-S-8802D Tack-Free Time min less than 90. temperature extremes. MIL-S-8802 Curing Time days at 25 C 3. x Long life reliability-cured Sealant Full Adhesion days 7-14. stays elastomeric from -54 C to MIL S-8802D Flow, sag or slump mm non-sag 149 C without hardening, cracking Working Time min 15 - 30.

3 Or becoming brittle under normal As Cured after 7 days at 25 C and 50% RH. weather conditions. ASTMD2240 Durometer Hardness, Shore A points 26. x Extended working time allows the ASTMD412 Ultimate Tensile Strength, maximum elongation MPa applicator more working and TT-S-01543A Staining None tooling time after application of TT-S00230C Joint Movement Capability Sealant resulting in neater after 14 days cure percent +(-)25. appearance and greater efficiency. ASTM D624 Tear Strength, die B N/m 3851. BENEFITS. DESCRIPTION All substrates should be cleaned with a x Easy to use; excellent recovery degreasing solvent such as xylene, from extension and compression.

4 Dow corning 793t Silicone Glazing Sealant is one-part neutral cure, toluene or MEK. For further cleaning construction grade Sealant that easily details consult 'Dow corning COMPOSITION extrudes in any weather. It quickly Construction Sealants Application x Non-Structural Glazing cures at room temperature by reaction Requirements and Precautions.'. with moisture in the air to produce a durable, flexible Silicone rubber seal. Note: When using any volatile solvent, always provide adequate ventilation. HOW TO USE Avoid heat, sparks and open flame. Cleaning the Surface Observe and follow all precautions Clean all joints and Glazing pockets, listed on solvent container label.

5 Removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants or Glazing compounds and protective coatings. Priming Tool or strike Sealant with light Figure 1: Sealing Glass with Certain substrates may require the pressure to spread the Sealant Dow corning 793t Silicone use of primer with this product. For against the back-up material and Glazing Sealant . further information please consult the joint surfaces. Tool Dow corning or your local immediately after Sealant distributor. application and before a skin forms.

6 Masking A tool with a concave profile is Areas adjacent to joints may be recommended to keep the masked to assure neat Sealant lines. Dow corning 793t Silicone Glazing Do not allow masking tape to touch Sealant within the joint. The Sealant clean surfaces to which the Silicone can be applied at outdoor Sealant is to adhere. Tooling should temperatures as low as -37 C. be completed in one continuous provided that surfaces are clean, stroke immediately after Sealant dry and frost free. application and before a skin forms. Masking should be removed Do not use soap or oil as a tooling immediately after tooling.

7 Aid. Remove masking as soon as each bead is tooled. Backing Materials Open cell polyurethane foam rod is Uncured Sealant may be cleaned the recommended back-up material. from tools and non-porous surfaces Polyethylene tape is recommended using commercial solvents such as for joints too shallow to allow foam xylol. On porous surfaces allow rod. excess Sealant to cure and then remove it by abrasion or other Note: Prior to applying mechanical means. Dow corning 793t Silicone Glazing Sealant it is necessary to For more detailed information on ensure the prevention of "Use," consult data sheet titled independent movement of glass 'DOW corning .

8 Panels. This can be achieved by CONSTRUCTION Sealant . using mechanical fasteners at the APPLICATION AND. one-third and two-third points of PRECAUTIONS.'. the joint. The Sealant may now be applied to the fastened joint. The fasteners are removed once the USES. Sealant has cured and the remaining Dow corning 793t Silicone gaps are filled with Sealant . Glazing Sealant is designed primarily for use in glass to glass applications. It is particularly Method of Application effective for Glazing butt ,butt fin Install back-up material or joint and lap shear joints and it can be filler, apply Dow corning 793t used for sealing curtain wall Silicone Glazing Sealant in a projections and other glass.

9 (See continuous operation. A positive Figure 1). pressure through adequate nozzle size to fill the joint in a single pass should be employed. A thin bead of USABLE LIFE AND. Silicone Sealant will accommodate STORAGE. more movement than a thick bead. When stored at or below 27 C. For large joints or where feasible Dow corning 793t Silicone Glazing Dow corning 793t Silicone Glazing Sealant has a shelf life of 6 months Sealant should be no thicker than from date of shipment. Keep 12mm and no thinner than 6mm containers tightly closed to avoid with width to depth ratio 2:1.

10 Contact with moisture. Previously opened cartridges may be used by simply removing the cured plug of Sealant from the nozzle. Dow corning is a registered trademark of Dow corning Corporation. We help you invent the future is a trademark of Dow corning Corporation. 2010, April 23 XIAMETER is a registered trademark of Dow corning Corporation. Ref. No. 61-7022B-01 2006, 2010 Dow corning Corporation. All rights reserved. 2. PACKAGING team of Product Safety and INFORMATION Regulatory Compliance (PS&RC). Dow corning 793t Silicone Glazing specialists available in each area.