Gluing Timber, Detailed Instructions.
In order to use the glue, wood pieces should:
Have a similar moisture content.
Have a similar structure, density and mechanical behavior
Be prepared at the same time
To prepare surfaces for gluing, make sure they are:
Straight and even to obtain close contact between the work pieces
Not compressed by machining (looks shiny)
Able to absorb glue
Free of oil, dust and other impurities
Freshly prepared to limit oxidization of the natural resin/oil content of the wood
Moisture of Content of wood varies:
Most kiln-dried wood is 8 to 12%
The glue reaction in the glue line will accept moisture content in the range of 10 to 20 %
When gluing open grain wood,wood with up to 25% moisture content may be acceptable
For wood with low moisture content (less than 10%), you must:
Spray or wipe water onto the surface to be glued without soaking the wood
Leave time for the moisture to distribute before applying the glue
Apply glue soon after dampening an open grained wood
Sand the moistened surface lightly before applying glue on closed grain wood or high-density wood types in order to remove any oil/ resin emulsion and to create a larger gluable surface
Leave some time after dampening a closed grain wood or high-density wood types to allow surplus water to evaporate
Be careful, because by adding water, the open time may be reduced quite a bit
Remember: moisture does not speed up the curing process but allows for a chemical reaction to take place
Varies according to wood structure and density, and may vary from job to job and from wood type to wood type
Is usually 1 kg/cm2 to 7 kg/cm2 for softwoods
Is usually 5 kg/cm2 to 15 kg/cm2 for hardwoods
Clamping pressure should always be adjusted to secure close contact, and always be sufficient to secure minimum or no foam buildup in the glue line
Clamping pressure must be distributed evenly over the glue line area
Generally, clamping time has expired when the foam pressed out from the glue line feels dry and somewhat crisp
Foam in a glue line has no structural strength whatsoever, and must not be considered as a gap filler
This type of adhesive has been used for structural wood working in Europe for the last 16 years or more and has been tracked by the research institutes and found to be quite sound over lengthy periods. It survives extensive boiling and is used in boat building.
Please call Boatcraft Pacific 07 3806 1944 ( +617 3806 1944) for how to contact your nearest reseller.
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