Sequoia Aircraft Corporation F.8L Falco, Construction Manual

Page: 405 / 423

l
F.8L Falco Construction Manual D–2 Revision 4, March 1, 2002
Application. To make application easier, resin and hardener may be transferred to small plastic
or glass containers—not metal containers*. Aerolite 306 and hardener are applied by the
following method:
1. Spread the resin, by means of a conventional glue spreader, wooden rod or clean brush*,
on one of the surfaces to be joined. Leave until tacky.
2. Apply the hardener to the other surface, using a clean brush*, felt pad, sponge or similar
iron-free applicator*.
3. Bring the surfaces together while the hardener-coated surface is still moist and maintain
firm contact by any convenient method until the glue has set.
* See note on avoidance of iron contaminations.
Coverage. The quantity of resin and hardener required for most joinery applications can be
determined only by workshop tests but when gluing to flat surfaces the following figures may be
taken as a guide:
Aerolite 306 resin solution 200 to 400 grammes per square metre (4 to 8 lb/100 sq ft)
Powder resin content of the solution:
140 to 275 grammes per square metre (2-3/4 to 5-1/2 lb/sq ft)
Hardener GBP.X or GBQ.X 100 to 150 grammes per square metre (2 to 3 lb/sq ft)
Assembly Times. From the moment at which contact is first made between the resin-coated and
hardener-coated surfaces, the joint components must be assembled and firmly positioned within
the following times:
Glue-line Temperature
Hardener 10°C/50°F 15°C/59°F 20°C/68°F 25°C/77°F 30°C/86°F
GBQ.X 30 min 20 min 10 min 5 min —
GBP.X — 25 min 15 min 10 min 5 min
Clamping Times. The following are the minimum periods during which the surfaces must be
held in contact:
Glue-line Temperature
Hardener 10°C/50°F 15°C/59°F 20°C/68°F 25°C/77°F 30°C/86°F
GBQ.X 5 to 6 hrs 2-3/4 hrs 1-3/4 hrs 1-1/4 hrs 1 hr
GBP.X — 3-1/2 hrs 2-1/4 hrs 1-1/2 hrs 1-1/4 hrs
These times should be at least doubled if the joint will be strained soon after removal from
pressure—e.g. when making laminated bends. At the end of the above clamping periods, joints
are sufficiently strong to withstand careful handling—but full strength and water resistance are
not attained until several days later. The rate at which the glue-line matures to its ultimate
strength greatly depends on the ambient temperature: because of this, destructive testing of glued
joints should be deferred about 14 days.