Momentive Performance Materials



  RTV6702
 

RTV6700 Series
One-Component,  Modified Alkoxy Adhesive Sealants
Product Description 

RTV6700 Series sealants are neutral cure, one-component, ready to use silicone adhesive sealants that cure to tough resilient silicone rubber on exposure to atmospheric moisture at room temperature.

These sealants are standard curing paste consistency products which can be applied to horizontal, vertical and overhead surfaces. They have a long work life which allows for tooling of finished assemblies.
Key Performance Properties 
  • Primerless adhesion to many metals and plastics
  • Non-corrosive to most substrates
  • Low odor cure
  • One-component product - No mixing required
  • Retain elastomeric properties at temperatures of -60C (-75F) to 204C (400F) for long periods and to  260C (500F) for short periods
  • Room temperature cure
  • Excellent electrical insulation properties
  • Excellent UV, chemical and weather resistance
    • Applications 

    The cure properties of these adhesive sealants make them ideally suited for applications in confined spaces. These paste-consistency silicone sealants can be used in thickness up to 6mm (1/4 in.) for bonding and sealing, joining metals and plastics, and electrical insulation.

    For applications requiring sealant thickness greater than 6mm (1/4 in.), Momentive Performance Materials one-component, addition cure or two component silicone rubber compounds are recommended.
    Typical Product Data 

    Typical Uncured Properties

    RTV6700 Series

    Color

    RTV6702

    White

    RTV6703

    Black

    RTV6708

    Translucent

    Consistency

    Paste

    Specific Gravity

    1.04

    Application Rate, gm/min.

    175

    Tack Free Time, minutes

    25

    Cure Through Time, hours

    24

    Typical Cured Properties (1)

    RTV6700 Series

    Mechanical:

    Hardness, Shore A

    18

    Tensile Strength, kg/cm2(lb/in2)

    15.8 (225)

    Elongation, %

    450

    Tear Strength, kg/cm (lb/in)

    5 (26)

    Peel Strength, kg/cm (lb/in)
        Glass
        Aluminum
        Lexan Polycarbonate*
        PVC

    6.3 (35)
    6.3 (35)
    6.6 (37)
    5.9 (33)

    Electrical:(2)

    Dielectric Strength, kV/mm(V/mil)

    16 (409)

    Dielectric Constant @ 100 Hz

    2.9

    Dissipation Factor @ 100 Hz

    .0002

    Volume Resistivity, ohm-cm

    2x1015

    Thermal:(2)

    Brittle Point, °C (°F)

    -60 (-75)

    Thermal Conductivity, Btu ft/ft2 h °F
    (W/m K)

    0.11
    (0.19)

    Coefficient of Thermal Expansion,
    mm/mm/°C

    3.0 x 10-4

    (1) Cured 7 days at 25°C (77°F) and 50% relative humidity.
    (2) Information is provided for customer convenience. These properties are not tested on a routine basis. Lexan is a Registered Trademark of Momentive Performance Materials.
    Instructions for Use 

    Surface Preparation

    RTV6700 series sealants will bond to many clean surfaces without the aid of primers. These surfaces include many metals, glass, ceramic, silicone rubber and some rigid plastics.

    Surfaces should be thoroughly cleaned with a suitable solvent to remove dirt, oil, grease and surface contaminants. The surface should be wiped dry before applying the adhesive sealant.

    Due to substrate variability, an evaluation should be made to determine whether acceptable bond strength develops for each specific application. For difficult to bond substrates, use of a primer is suggested. SS4004, SS4044 and SS4179 primers from Momentive Performance Materials are recommended for use with these sealants. Complete information and usage instructions for these primers are contained in a separate product data sheet (#1532).

    APPLICATION AND CURE TIME CYCLE

    These adhesive sealants may be applied directly to clean or primed substrates. Where broad surfaces are to be mated, the sealant should be applied in a thin, less than 6mm (1/4 in.) diameter bead or ribbon around the edge of the surface to be bonded.

    The cure process begins with the formation of a skin on the exposed surface of the sealant and progresses inward through the material. At 25C (77F) and 50% relative humidity, RTV6700 will form a surface skin that is tack free to the touch in 20-25 minutes. Once the tack free skin has begun to form, further tooling of the adhesive sealant is not recommended.

    As the adhesive sealant cures, methly alcohol and residual ammonia vapors are released from the sealant surface.

    Because these adhesive sealants cure by reacting with atmospheric moisture, higher temperatures and humidity will accelerate the cure process lower temperatures and humidity will slow the cure rate.

    Exact cure time will depend on temperature, humidity, sample thickness and sealant configuration. Since cure time increases with thickness, use of these adhesive sealants should be limited to section thickness of 6mm (1/4 in.).

    PHYSICAL PROPERTY DEVELOPMENT

    In addition to the effects of temperature and relative humidity, development of maximum bond strength will depend on joint configuration, degree of confinement, sealant thickness and substrate porosity. Normally, sufficient bond strength will develop in 12-24 hours for RTV6700 and permit handling of parts. Stress should not be applied to the bonded joint until full adhesive strength has developed. Eventually the adhesive strength of the bond will exceed the cohesive strength of the silicone rubber adhesive sealant itself. Always allow maximum cure time available for best results.

    NON-CORROSIVE PROPERTIES

    RTV6700 series adhesive sealants comply with the non-corrosive requirements of MIL-A-46146B on aluminum and steel.

    When allowed to cure in enclosed conditions, these sealants will discolor sensitive metals such as copper and brass. When allowed to cure in non-enclosed conditions, these sealants may discolor sensitive metals such as copper and brass but only when in direct contact.

    PACKAGING AND DISPENSING

    RTV6700 series adhesive sealants are supplied ready-to-use in 10.1 fl. oz. caulking cartridges, 5 gallon (40 lb.) pails and 55 gallon (450 lb. drums).

    These sealants may be dispensed from caulking cartridges by using hand operated caulking gums or air operated guns. Air operated guns will allow greater control and application speed. Cartridges are easy-to-use, can be put into production quickly and require minimal capital investment.

    NOTE: Do not exceed 45 psig when using air powered caulking guns.Bulk containers require a larger initial investment in dispensing equipment, but offer economical packaging for volume production. Bulk dispensing systems are air-operated extrusion pumps coupled to hand or automated dispensing units. Pumps which are specifically designed for pumping one-component RTV silicone rubber have Teflon* seals, packages and Teflon lined hoses to prevent moisture permeation and pump cure problems. Specific details on dispensing systems and manufacturers are available in a separateMomentive Performance MaterialsRTV Silicone Rubber Equipment Guide (#1541).

    CLEANUP AND REMOVAL

    Before cure, solvent systems such as naphtha or methly ethyl ketone (MEK) are most effective.

    After cure, selected chemical strippers which will remove the silicone rubber are available from other manufacturers. Specific product information may be obtained on request.
    		The warranty period for RTV6700 series in 5 gallon pails or 55 gallon drums is 12 months and in 10.1 fl. oz. caulking cartridges is 6 months from the date of shipment from Momentive Performance Materials if stored in the original unopened container at or below 27C (80F).
    		Momentive Performance Materials products may be ordered from Momentive Performance Materials, Waterford, N.Y. 12188, the Momentive Performance Materials sales office nearest you, or where appropriate, an authorized Momentive Performance Materials product distributor.

    CDS4975
     
     

    Patent Status
    Nothing contained herein shall be construed to imply the nonexistence of any relevant patents or to constitute the permission, inducement or recommendation to practice any invention covered by any patent, without authority from the owner of the patent.Patent Information to be determined for product by client.

    Product Safety, Handling and Storage
    Customers considering the use of this product should review the latest Material Safety Data Sheet and label for product safety information, handling instructions, personal protective equipment if necessary,and any special storage conditions required. Material Safety Data Sheets are available at www.momentive.com or, upon request, from any Momentive Performance Materials representative. Use of other materials in conjunction with Momentive Performance Materials products (for example, primers) may require additional precautions. Please review and follow the safety information provided by the manufacturer of such other materials.

    Limitations
    Customers must evaluate Momentive Performance Materials products and make their own determination as to fitness of use in their particular applications.

    Typical product data values should not be used as specifications.
    Assistance and specifications are available by contacting
    Momentive Performance Materials:
    North America        cs-na.silicones@momentive.com
    Latin America        cs-la.silicones@momentive.com
    Europe/Middle East/Africa cs-eur.silicones@momentive.com
    Pacific        cs-ap.silicones@momentive.com

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