Resorcinol glue

Characteristic thin dark reddish brown glue joints laminating the plies together of this exterior grade plywood

Resorcinol glue, also known as resorcinol-formaldehyde, is an adhesive combination of resin and hardener that withstands long-term water immersion and has high resistance to ultraviolet light.[1][2] The adhesive, introduced in 1943, has been popular in aircraft and boat construction.[2]

Until the invention of epoxy resin, resorcinol was one of the most common marine glues. Unlike epoxy, it does not have gap filling properties, requiring joints to be close fitting and clamped under pressure to achieve good results. The glue comes in two parts, a deep red syrup and a light brown powder, that are mixed to form a dark reddish-brown glue.

The most common application for resorcinol glue is in adhering the plies of exterior and marine grades of plywood. It is strong. Currently one of its main uses is to put together plywood, laminated support beams and other wooden structural elements. Wooden airplane frameworks have long been glued with resorcinol formulations.

Uncured resorcinol has a relatively short shelf life of about two to three years, depending on storage temperature. Its use has declined since the 1990s due to the ease of use and versatility of epoxy glues and fillers.[citation needed]

Although the greater ease of use and versatility of epoxy makes it much more popular, epoxy has poor UV resistance and in most structural applications has only a modest heat resistance, making it less than ideal for many outdoor uses. Resorcinol remains a suitable adhesive for exterior and marine use. Unlike epoxy, it is not gap-filling, so requires a higher standard of workmanship and joint fitting.[3]

See also

References

  1. ^ Johnson, W. Curtis (September–October 1993). "American Woodworker". New Track Media. p. 30. ISSN 1074-9152
  2. ^ a b Federal Aviation Administration (2 April 2014). Aviation Maintenance Technician Handbook-Airframe, Volume 1. Mepcount Media LLC. p. 600. ISBN 978-1-62508-006-6.
  3. ^ Pardy, Larry (1999). Details of Classic Boat Construction (1999 ed.). Thomas Reed Publications. pp. Appendix A. ISBN 978-0964603684.


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