SS721 Big Glass Silicone Structural Glazing Sealant
SS721 Big Glass Silicone Structural Glazing Sealant is a translucent one-component, high strength acetoxy curing silicone sealant designed and tested for big glass structurally glazed curtain wall applications. The material is supplied as a paste, which cures into an extremely tough elastomeric silicone rubber ensuring a durable, flexible, watertight bond upon exposure to atmospheric moisture.
- SS721Big Glass Silicone Structural Glazing Sealant belongs to RTV-1 product;
- Acetoxy cure, high tensile strength, fast curing, Translucent, no change of color;
- Excellent adhesion to glass and ceramics;
- Excellent resistance to weather, the life is 50 years under usual weather;
- Remains flexible over a temperature range of -58°F(-50°C) to 302°F(150°C).
- Sealing in glass joints;
- Structural glazing in glass curtain wall;
- Structural glazing in big glass and glass roof structural engineering;
|Tack free time(23°C/73°F, 50% RH)
|Flow, Sag or Slump
||0.1 inches max
|Durometer Hardness, Shore A
|Ultimate Tensile Strength
|Specifications: Typical property data values should not be used as specifications. Assistance with specifications are available by contactingFoshan Gaojian Chemical Industry CO., LTD.
SS721 Big Glass Silicone Structural Glazing Sealant meets or exceeds the requirements of the following specifications for one-part sealants.
SS721 Big Glass Silicone Structural Glazing Sealant is available in translucent.
SS721 Big Glass Silicone Structural Glazing Sealant is available in 10.1 fl. oz. (300 ml) plastic caulking cartridges.
SS721 Big Glass Silicone Structural Glazing Sealant should not be used, applied or is not recommended:
- For SSG system.
- For all kinds of material that can effuse grease, plasticizer or solvent;
- For the airproof location, because it is required to absorb water in air to cure for the sealant;
- For the frosty or moist surface;
- For the continually soggy or moist place;
- For metal and coated glass;
- For the alkaline materials like marble, granite etc;
- The product if the temperature is below 4℃or above 40℃ on the surface of the materials.
Complete technical information and literature are available from Foshan Gaojian Chemical Industry CO., LTD.
The following materials are required to be submitted to Foshan Gaojian Chemical Industry CO., LTD. to receive suggestions for the use of SS721 Big Glass Silicone Structural Glazing Sealant.
- Architectural and shop drawings for review and comment.
- Design wind load requirement(s) for project.
- Glass or panel sizes.
- Production samples of metal, glass, gaskets, spacers and setting blocks with type and manufacturer identified.
- Specification and/or identification of paint or finish to which SS721 Big Glass Silicone Structural Glazing Sealant is intended to adhere (i.e., 215-R1 anodized or if paint; manufacturer, finish system and ID#).
Foshan Gaojian Chemical Industry CO., LTD. will provide the following, after reviewing the materials above:
- Determination as to whether the submitted joint dimensions meet the minimum design criteria necessary for the use of SS721 Big Glass Silicone Structural Glazing Sealant.
- Short-term adhesion data using (typically) the ASTM C794 and/or ASTM C1135 test method. Other test methods may be employed.
- Short-term compatibility test results on gaskets, spacers and setting blocks and other accessories per ASTM C1087 or Foshan Gaojian Chemical Industry CO., LTD. test method for compatibility.
- Information regarding suggested primers, when required.
Foshan Gaojian Chemical Industry CO., LTD. will not:
- Design sealant joints.
- Provide comments on the structural integrity of overall framing system(s).
- Provide long-term performance data.
The design professional has final responsibility for the determination of structural sealant joint dimensions based on project conditions, design wind load(s), glass or panel sizes, anticipated thermal, seismic or other movement of the system.
Sealants may not adhere or maintain long-term adhesion to substrates if the surface is not prepared and cleaned properly before sealant application. Using proper materials and following prescribed surface preparation and cleaning procedures is vital for sealant adhesion. Foshan Gaojian Chemical Industry CO., LTD. can provide quality control information and suggestions to user upon request.
- Use clean, fresh solvent as recommended by the sealant manufacturer’s test report. When handling solvents, refer to manufacturer’s MSDS for information on handling, safety and personal protective equipment. Isopropyl Alcohol (IPA) is commonly used and has proven useful for most substrates encountered in SSG systems. Xylene and Toluene have also been found useful on many substrates.
- Use clean, white cloths free of lint or other lint-free wiping materials.
- Use a clean, narrow-blade putty knife when tooling structural silicone into the cavity.
- Use primer when required.
- Remove all loose material (such as dirt and dust), plus any oil, frost or other contaminants from the substrates to which the structural silicone will be adhered.
- Do not use detergent to clean the substrate as residue may be left on the surface.
- Clean the substrates receiving the sealant as follows: Using a two-rag wipe technique. Wet one rag with solvent and wipe the surface with it, then use the second rag to wipe the wet solvent from the surface BEFORE it evaporates. Allowing solvent to dry on the surface without wiping with a second cloth can negate the entire cleaning procedure because the contaminants may be re-deposited as the solvent dries.
- Change the cleaning rags frequently, as they become soiled. It is easier to see the soiling if white rags are used. Do not dip used wipe cloths into solvent as this can contaminate the solvent. Cleaning with contaminated solvent can result in sealant adhesion issues. Always use clean containers for solvent use and for solvent storage.
- When cleaning deep, narrow joints, wrap the cleaning cloth around a clean, narrow-blade putty knife. This permits force to be applied to the cleaned surface.
- Clean only as much area as can be sealed in one hour. If cleaned areas are again exposed to rain or contaminants, the surface must be cleaned again.
SS721 Big Glass Silicone Structural Glazing Sealant will bond to many clean surfaces without the aid of a primer. For difficult-to-bond substrates, the use of a primer or special surface preparation should be evaluated. An evaluation should be made for each specific application/substrate to determine quality of bond. When properly used, primers help assure strong and consistent sealant adhesion to surfaces that may be difficult to bond. Most primers are a blend of organic and inorganic chemicals, resins and solvents. Obtaining the proper materials, as well as following the prescribed procedures, is vital to ensure the successful use of primers. PRIMER APPLICATION IS NOT A SUBSTITUTE FOR SURFACE PREPARATION. Consult Foshan Gaojian Chemical Industry CO., LTD. primer datasheet(s) for specifics and recommendations for use.
Primers may contain solvents. When handling solvents, refer to manufacturer’s MSDS for information on handling, safety and personal protective equipment.
- To simplify clean up of excess sealant, use easy to release, pressure sensitive tape to mask adjacent surfaces before applying the structural silicone sealant.
- Start from the top down and overlap the runs. Tool in direction of over-lap so that masking is not disturbed during tooling.
- Remove masking immediately after application of silicone or as soon as possible or practical.
- Drop cloths can be used to cover any surfaces likely to collect excess sealant removed during tooling operations.
- Apply the sealant by pushing the bead ahead of the nozzle and making sure that the entire cavity is filled. Tooling should be done neatly, forcing the sealant into contact with the sides of the joint, thus helping to eliminate any internal voids and assuring good substrate contact. AIR POCKETS OR VOIDS WITHIN THE STRUCTURAL CAVITY ARE NOT ACCEPTABLE.
- Due to the smooth consistency of SS721 Big Glass Silicone Structural Glazing Sealant, tooling agents such as water, soap or detergent solutions are not necessary or recommended. Dry tooling is recommended.
- Sealant application is not recommended when the temperature is below 40°F (4°C) or if frost or moisture is present on the surfaces to be sealed.
- SS721 Big Glass Silicone Structural Glazing Sealant works best when applied to surfaces below 104°F (40°C).
- SS721 Big Glass Silicone Structural Glazing Sealant should not be applied in totally confined spaces since the sealant requires atmospheric moisture from the air and release of cure by-products to cure properly and develop typical properties. Please consult Foshan Gaojian Chemical Industry CO., LTD. technical services for additional information on depth of cure for this product.
- The cure rate of this product is dependent upon temperature and the availability of atmospheric moisture. Under Standard Conditions (relative humidity of 50±5% at an air temperature of 73.4±2°F [23 of ±1°C]) this material can attain a cured thickness of 2-3 mm per 24 hours (assuming ample access to atmospheric moisture). As temperature decreases, the cure rate slows down (and vice versa). Low moisture environments will also reduce the cure rate. Near-confined spaces which limit the overall access to atmospheric moisture will cure only from that surface which has access to the atmosphere. Colder temperatures can significantly increase cure times and can open the possibility of sealant irregularities if joint movement occurs while sealant is not fully cured. The following reference provides additional information on Movement-During-Cure of sealant joints: ASTM C1193 – Standard Guide for Use of Joint Sealants; section 12.5.
Method of Application
SS721 Big Glass Silicone Structural Glazing Sealant can be dispensed directly from cartridges and foil sausage packs.