Sorry for a little bit messy earlier reply, I typed it with a phone
while putting a child to sleep..
I ran through the options when I did the job, and ended up with this solution because I could not disassemble the cabinet. If you can open the cabinet where the icebox is, I definitively propose you use solid polyurethane
insulation board (what is the English
for this... fixed stuff that you use to insulate the house). This board is made of two-component polyurethane
and contains closed cells, thus offering much better lambda and less hassle when installing. As the heat conductivity is critical especially if spaces are confined, do NOT choose anything cheaper, like styrofoam - difference in heat conductivity is 100%.
Some 50 mm (2 inches) of solid PU is enough - the more the better. Finalize the work with sprayable PU, (yes, the stuff you get from hardware
stores. Select the type that will stay flexible as this type usually expands much less and is less hazardous to the structures. ) Be very careful with corners and seams.
Check also that there is no air leaks
in the box (e.g. drainage hole in the bottom and an open hole where the pipes of the evaporator come through in the top + cold = constant pumping of warm air through the box..)
If you must spray PU into the structures, prepare for a MESS. Do cover all the surfaces and have lots of acetone and cloths available. Cover the laptop
you need with the camera
with a plastic bag (preferably transparent
. Use good rubber gloves to avoid using acetone to your hands. Try to use as large extra hoses as possible in the PU bottles and fix them very carefully. Pistol type PU dispatcher is much better than the bottles. remember to clean the dispatcher and the hoses carefully with a cleaning
liquid before any breaks. Remeber that the cleaning
agent contains acetone - have acetone compliant extra hoses or remove hoses from the pistol when PU is still wet.
Do not try to fill the cavities with one spraying. Spray first one third of the volume (have an assistant to use the flexible camera), let it expand and the next day spray another third etc. It may also be wise to spray some water
in to accelerate the fixing of the foam.
Remember that the propellant in the PU bottles is usually a mixture of propane
and butane (with no odorant) and thus HIGHLY FLAMMABLE. In confined spaces like the boat you can in principle reach the lower explosive limit. Hence, disconnect the batteries before the operation. Also organize good ventilation as propane
and butane can displace oxygen and make you feel dizzy.
Hope this helps