IS802, IS803, IS808 and IS800.09 one-component, ready-to-use silicone adhesive sealants have a paste-like consistency and cure to silicone rubber on exposure to atmospheric moisture at room temperature. Because these paste-consistency products will flow only with external pressure, they may be applied to horizontal, vertical and overhead surfaces in thicknesses up to 6mm (1/4 in.) They have sufficient uncured body to adhere small objects while cure is taking place.

IS800 Series adhesive sealants utilize a moisture vapor cure system and release acetic acid vapors from the sealant surface as a by-product of cure.

The following products are identical materials, differing only in color:

IS802 ? White
IS803 ? Black
IS808 ? Translucent
IS800.09 - Aluminum

The paste-like consistency of IS802, IS803, IS808 and IS800.09 adhesive sealants makes these products ideally suited for application to vertical and overhead surfaces where use of pourable self-leveling sealants would not be practical. These paste-consistency silicone sealants may be used in thicknesses up to 6mm (1/4 in.) for bonding and sealing, joining metals and plastics, and electrical insulation.

These sealants are not for use in delicate electrical and electronic applications in which corrosion of copper, brass or other sensitive metals is undesirable.

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

FDA STATUS

IS802, IS803 and IS808 can be used in food contact applications when FDA regulations apply. Refer to Momentive Performance Materials publication no. (4319) ?Food Contact Applications, Silicone Rubber Compounds? for specific regulations, limitations and conditions of use.

USDA STATUS

IS802, IS803 and IS808 sealants may be used on equipment which may contact edible products in official establishments operating under the Federal Meat and Poultry Products Inspection Program. See reference Momentive Performance Materials publication no. (4319): ?Food Contact Applications, Silicone Rubber Compounds? for specific details.

NSF INTERNATIONAL STATUS

NSF International lists IS802, IS803 and IS808 sealants under NSF International Standard No. 51 (Plastic Materials and Components for Use in Food Equipment), as satisfactory for use on food contact surfaces. Refer to Momentive Performance Materials bulletin (4319) before use.

UL STATUS

IS802, IS803 and IS808 silicone rubber adhesive sealants are recognized by Underwriters Laboratories, Inc. under their Component Recognition Program (UL File No E36952). Refer toMomentive Performance Materialspublication no. (4320) ?Underwriters? Laboratories Recognition for Silicone Rubber Adhesive Sealants? for additional information.

IS802, IS803, and IS808 adhesive sealants will bond to many clean surfaces. These surfaces typically include many metals, glass, ceramic, silicone rubber and some rigid plastics. These silicone adhesive sealants will also produce fair bonds to some organic rubbers and flexible plastics not containing fugitive plasticizers (which migrate to the surface impairing adhesion). An evaluation should be made to determine bond strength for each specific application. For difficult-to-bond substrates use of a primer is suggested. Momentive Performance Materials primers such as SS4004, SS4044 and SS4179, are recommended for use with these adhesive sealants. If the evaluation of IS802, IS803 or IS808 sealants indicates that greater adhesion levels are required, Momentive Performance Materials sealants such as RTV102, RTV103 or RTV108 sealants should be considered. (Complete information and usage instructions for primers and RTV products are contained in separate product data sheets.)

For optimum adhesion, surfaces should be thoroughly cleaned with a suitable solvent to remove dirt, oil and grease. The surface should be dry before applying the silicone sealant.

IS802, IS803 and IS808 silicone adhesive sealants are supplied ready-to-use in collapsible squeeze tubes, caulking cartridges, and in bulk containers.

Collapsible tubes may be squeezed by hand or with the aid of mechanical wringers which allow more complete removal of material from the tube. Air-operated dispensing guns may also be used with tubes and offer the advantages of improved control and faster application for production line use. Adhesive sealants may be dispensed from caulking cartridges using simple mechanical caulking guns or air-operated guns. Air-operated guns will allow greater control and application speed. Both tubes and cartridges are easy to use, can be put into production quickly and require minimal capital investment.

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, packings 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 (CDS 1541).

Note: Do not exceed 45 psig when used in air-powered caulking guns.

Momentive Performance Materials paste-consistency silicone adhesive sealants may be applied directly to the clean (or primed) substrate. Where broad surfaces are to be mated, the adhesive 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.

* TEFLON is a registered trademark of DuPont.

The cure process begins with the formation of a skin on the exposed surface of the adhesive sealant and progresses inward through the material. At 25C (77F) and 50% relative humidity, these products will form a surface skin which is typically tack-free to the touch in 20 to 30 minutes. Once the tack-free skin has begun to form, further tooling of the silicone adhesive is not advisable.

High temperatures and high humidity will accelerate the cure process low temperatures and low humidity will slow the cure rate.

As the silicone adhesive sealant cures, acetic acid vapors are released from the adhesive sealant surface. The odor of acetic acid will completely disappear when the cure is completed.

In addition to the effects of temperature and relative humidity, development of maximum physical properties will depend on joint configuration, degree of confinement, sealant thickness and substrate porosity.

A 3mm (1/8 in.) section of silicone adhesive sealant will cure through in approximately 24 hours at 25C (77F), and 50%, R.H. Since cure time increases with thickness, use of IS802, IS803 and IS808 silicone adhesive sealants should be limited to thicknesses of 6mm (1/4 in.) or less. For applications requiring sealant thicknesses greater than 1/4 inch, Momentive Performance Materials one component, addition cure or two component silicone rubber compounds are suggested.

Normally, sufficient strength will develop in 12 to 24 hours to permit handling of parts. Minimum stress should be applied to the silicone sealant until full physical properties are developed.

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

IS802, IS803, IS808 and IS800.09 adhesive sealants may be ordered from Momentive Performance Materials, Waterford, NY 12188, the Silicone Sales office nearest you or an authorizedMomentive Performance Materialssilicone product distributor.