Liquid one-component polyurethane adhesive 686.20

Liquid one-component polyurethane adhesive
for load-bearing structural wood bonding



Jowapur® 686.20 is a joint-filling fibre-reinforced one-component adhesive
curing with wood moisture or ambient humidity. Jowapur® 686.20 is used for
fingerjointing, and matches in the application range the adhesive type I
following the DIN EN 301. Other uses are non-loadbearing wooden structural
components with dimensional stability, and for many other substrates.



Jowapur® 686.20 was tested according to the DIN 68 141-1 following DIN EN
302 by the Otto-Graf Institut (MPA) of the University of Stuttgart, respectively
by the Norsk-Treteknisk Institute/Norway, also for other criteria. It was
established that the adhesive may be used for the manufacture of loadbearing
glued fingerjoints.
Jowapur® 686.20 has been confirmed as adhesive for the manufacture of
fingerjoints acc. to the DIN 68 140-1 by the DIBt (with certificate number
The adhesive cures due to the components of isocyanate groups which cure
with the wood moisture to form a resin which is not water-soluble.

 Directions for Use:

If structural components according to the 68 140-1 are to be manufactured
please observe pages 3 – 4 and the certificate Z-9.1-622.



fingerjointing acc.
to DIN 68140-1 / EN

Open time at +20 °C: approx. 20 min. approx. 10 min.
Processing temperature: > +10º C > +20ºC

Pressing time at +20 °C:

approx. 1 h see table page 4

Pressure soft wood species:

0,3 – 1,0 N/mm² 

acc. to DIN 68140-1 /

EN 385 N/mm²


Pressure hard wood species:

0,8 – 1,2 N/mm² 
Application amount: 100-230 g/m²  *)120-200 g/m² 

Wood moisture laminated timber

8 – 18%  8 – 15% 

Wood moisture fingerjointing

8 – 18%  8 – 18% 

for wood for interior applications with a moisture
content of 6 – 8 % the surfaces have to be misted with

*) The adhesive application amount needs to be sufficient to ensure that the

bonding partners are fully coated after pressing.




Technical Data:
Viscosity at +20 °C [mPas]: approx. 10,500 (Brookfield)
Density [g/cm3]: approx. 1.15
Solids [%] approx. 99.5
NCO content [%]: approx. 15
Appearance: light beige




May be stored as shown on label, max. for at least 6 months in original sealed
containers, cool and dry (15 – 25 °C).


Cured adhesive can undergo disposal with the domestic waste disposal.

Packaging: Types of packaging and units upon request.

For further information concerning handling, transport and disposal, please
refer to the Safety Data Sheet.
Our information on this data sheet is based on test results from our
laboratories as well as on experience gained in the field by our customers. It
can, however, not cover all parameters for each specific application and is
therefore not binding for us. The information given in this leaflet represents
neither a performance guarantee nor a guarantee of properties, nature,
condition, state or quality. No liability may be derived from these indications
nor from the recommendations made by our free technical advisory service.