Momentive IS5628E Processing Recommendations
Momentive performance materials Silicone IS5628E adhesive/sealant may be applied directly to clean substrate. Where broad surfaces are to be mated, sealant should be applied in a thin, less than 6 mm diameter, bead or ribbon around the edge of the surface to be bonded.
RTV adhesive/ sealants cure on exposure to moisture in the air at room temperature. The cure begins with the formation of a skin on the exposed surface of the sealant and progresses inward through the material. At 25°C and 50% relative humidity, this product will form a surface skin, which is tack free to the touch in 10 minutes. Once a skin has begun to form, further tooling of the adhesive is not advisable. High temperatures up to 70°C and high humidity will accelerate the cure process; low temperatures and low humidity will slow down the cure. During the initial stages of cure, a noticeable odour caused by the liberation of the acetic acid vapour is produced. This odour will totally disappear as the cure progresses
A 2 mm section of adhesive/sealant will cure through in 24 hours. Since cure time increases with thickness, use of IS5628E should be limited to section thicknesses of 6 mm.
For removing uncured adhesive/ sealants, solvent systems such as naphtha, methyl ethyl ketone (MEK) or trichloroethylene (TCE) are most effective. After cure, selected chemical strippers, which will dissolve the silicone rubber, are available from other manufacturers. Specific product information may be obtained on
request.
Handling and Safety
Material Safety Data Sheets are available upon request from Momentive performance materials. Similar information for solvents and other chemicals used with the Momentive performance materials products should be obtained from your supplier. When solvents are used, proper safety precautions must be observed.
Storage and Warranty Period
The shelf life will be indicated by the ‘ use before date’ on the associated documents with a minimum of 4 months when stored in the original unopened containers below 27° C.