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Glue Bond Durability

Choosing Exterior or Exposure 1 for Glue Bond Durability

The bond classification relates to moisture resistance of the glue bond and the performance requirements are based on the moisture resistance of the panel. Glue Bond durability classification of the panel does not relate to a panels’ fungal decay resistance which can occur when the moisture content exceeds 20 % for an extended period.

 APA trademarked panels are produced in two bond classifications, Exterior and Exposure 1, both meeting the requirements of EN 314: Plywood – Bond quality.

Exterior – Bond Class 3

Covers APA plywood grades: C-C (CCX) ;  A-C (ACX) ; B-C (BCX);  Sturd-I-Floor and C-C plugged

  • Bond Class 3 glue line according to EN 314-1 and EN 314-2.
  • Applicable end use service conditions according to EN 636-1 (dry) , EN 636-2 (humid) asnd EN 636-3 (exterior)
  • Produced in line with US Product standards PS1-19, PS 2-18 and APA performance Stand PRP-108
  • Biological durability: must have adhesive bond capable of withstanding repeated wetting and re-drying or long-term exposure to weather or other conditions of similar severity.  If the species are not naturally durable and the plywood is liable to remain wet (20% M.C. or greater) for long periods then suitable preservative treatment is strongly advised.
 Exposure 1 – Bond Durability Class 2

Covers APA plywood grades: C-D (CDX);  Sturd-I-Floor and C-D plugged

  • Equivalent to a Bond Class 2 glue line according to EN 314-1 and EN 314-2.
  • Applicable end use service conditions according to EN 636-1 (dry) and EN 636-2 (humid)
  • Produced in line with US Product standards PS1-19, PS 2-18 and APA performance Stand PRP-108
  • Intended to resist the effects of moisture due to construction delays or other conditions of similar severity but not long-term exposure to weather.
  • Made with the same exterior adhesive used in Exterior panels but with some restrictions on exposure time due to the different veneer lay-up.