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Silicones from Dow Corning
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Gels


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Repairing Gels or Encapsulants

For repairing small areas and tears in elastomers a one-component, room-temperature-curing silicone sealant may be used. Moisture cure RTVs will readily adhere to addition cure materials. 

For repairing larger areas, such as where components have been removed or replaced, the same or similar gel or elastomer should be used for the original part. For example, room-temperature curing SYLGARD 184 silicone elastomers can be used to make field repairs in parts protected initially with heat curing SYLGARD 182 silicone elastomer.
Silicone elastomers are easily repaired. Sections can be cut away with a knife for replacement of components, and the repaired region can be repotted with fresh encapsulant.  Fingerprints, dust or dirt may prevent the new material from bonding to the older, cured material. To ensure adhesion, it is recommended that the old surface be either re-cut or abraded with sandpaper before applying the fresh material.
Silicone gels can also be repaired. Similar to encapsulants, the gel can be manually removed. It is also possible to swell the gel with solvent prior to removal. This process will make it easier to remove the gel. The swelled gel can then be removed, repair work done and the area repotted with new gel.  Softer gels have the unique ability to self heal. Over a period of time the knit line in the gel will disappear and the gel cannot be separated without tearing the gel. 
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  1. Gel and Encapsulant Processing - General


  2. Gel and Encapsulant Processing - General


  3. Substrate Preparation


  4. Material Preparation


  5. Applying Gel or Encapsulant


  6. Curing


  7. Cure Inhibition


  8. Where Does Inhibition Occur


  9. Repairing Gels or Encapsulants


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