|Dow Corning brand
Silicone Sealants - designed for industrial performance requirements
Silicone sealants from Dow Corning are designed to be the answer to your sealant problems. These products are versatile, durable and have exceptional performance characteristics.
They are specially formulated for industrial use. When choosing sealants, you are getting tough industrial sealants, not just modified consumer products. They are capable of performing many functions and stand up to tough demands for a variety of applications - including areas where organic material may struggle.
Dow Corning silicone sealants bond, caulk, seal, fasten, insulate, protect and repair mane types of materials.
These products are virtually unaffected by weather, temperature extremes, chemicals and aging, they offer a high level of performance even under the most severe operating conditions.
This guide will enable you to select the best suited sealant which matches your specific application needs.
A technical data sheet is available for all products mentioned in the following tables.
Please note applications on the last page.
Although Dow Corning silicone sealants posses excellent bond strength, maximum adhesion is only attained on clean and dry. Contaminants, such as dirt, grease, water, tar or rust act as release agents and prevent the formation of durable bonds. It is strongly recommended, therefore that wet or unclean surfaces be prepared before sealants are applied. (Continued)
* Wipe contaminated surface with a clean, oil-free cloth.
* Rewipe surface with a suitable cleaner or industrial solvent, such as mineral spirits, naphtha or ketones.
Note: do not clean surface with detergent or soap and water.
(Soap residue may act as release agent.)
* Roughen rubber surfaces with sandpaper. Make a spot check to determine the adhesion of sealants for each application. Bond strength will increase as the sealant cures.
How to apply
Apply Dow Corning adhesives/ sealants to one of the pre- pared surfaces, then quickly cover with the other substrate to be bonded.
On exposure to moisture, the freshly applied material will ,, skin over" in about 5-10 minutes (depending on the product) at room temperature and 50% relative humidity. Any tooling should be completed before this skin forms. The surface is easily tooled with a spatula.
Use of primer
For maximum adhesion, the use of Dow corning 1200 OS primer is recommended. After solvent cleaning, a thin coat of Dow corning 1200 OS primer is applied by dip- ping, brushing or spraying. At normal temperatures and humidity conditions (room temperatures 50% R.H.), the primer should be allowed to air dry from 15 to 90 minutes. The primer cures in contact with air moisture, low humidity will necessitate longer drying time.
The required drying time for a specific area should be determined prior to use. Primer which was allowed to cure extensively will not promote adhesion anymore. As general rule, drying time of more than 6 hours at normal temperatures and humidity should be avoided.
After skin formation, cure continues inward from the surface. In 24 hours (at room temperature and 50% relative humidity) Dow Corning adhesives/ sealants will cure to depth of about 2-4 mm. very deep sections, especially when access to atmospheric moisture is restricted will take longer to cure completely. Cure completely. Cure time is extended at lower humidity levels.
As the sealants cure by reaction with moisture in air, keep the container tightly sealed when not in use. A plug of used material may form in the tip of a tube or cartridge during storage. This is easily removed and does not affect the remaining contents.
Some Dow corning adhesives/ sealants release a small amount of acetic acid during cure. This may cause corrosion on some metallic parts or substrates, especially in direct contact or when the cure is carried out in a totally enclosed environment which world not allow cure by-products to escape.
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