Spray Coating with Butyl Rubber
EG AND G FLORIDA COCOA
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An inexpensive technique of renewing worn or damaged butyl rubber equipment was developed the Kennedy Space Center, Florida. This technique was required to extend the service life of the protective butyl rubber suits worn by workers handling hypergolic self-igniting fuels and oxidizers. Previously, there was no economical way to refurbish suits worn thin through extended use and cleaning. To coat an entire suit, a commercially available two-part butyl adhesive is mixed with Freon 113 trichlorofluoroethane to obtain an optimum spray viscosity. The suit fabric is then prepared for spraying and the mixture applied using an external air-mix spray gun Binks or equivalent with S-66 nozzle at 70 to 80 psig. Three coats are applied with a red dye added to the second coat to assure even distribution. The spray coating increases the weight of the suit 1 to 2 pounds, depending on suit size, and adds approximately 6 millimeters to the fabric thickness. Complete coating of butyl suits using the spray technique has proven to be an effective refurbishment technique. No appreciable differences have been noted in the wear quality of the sprayed coating as compared to the base fabric. This technique would have potential applications in coating any flexible material exposed to corrosive environments. Since standard commercial equipment and materials are used and no special operator skills are required, its use is not limited to large operations.
- Elastomers and Rubber
- Protective Equipment