Which sealant and adhesive to use?
The chart includes some practical advice for the use of right products offered in our program.
How is the procedure for right sealing?
- Tape the edges with masking tape.Cut the cartridge at the top and screw on the nozzle, which has to be cut according to the width of the joint and placed in the gun.
- The sealant should be applied as evenly as possible.
- At the end, level the sealant with an appropriate instrument of a well soaped finger.
- Remove the masking tape before the sealant starts to harden.
- Clean fresh sealant and tools with Tekafin cleaner. Hardened sealant should be removed mechanically first and then with the cleaner for hardened silicone Tekapursil S of Apursil.
How to correct dimension dilatating joint?
For the optimal elastic characteristics of the sealant a correct width / depth ratio is important (2:1) or maximum of 1:1. The sealant must not adhesion the bottom of the joint but only its sides. The minimum joint width is 6 mm, the maximum 20 mm.
How to apply polyurethane foam?
Hand held foam
Surfaces should be clean, free of dust, grease and other impurities. Dry and porous surfaces should be moistened with water. The optimal temperature of can at work is 20 - 25 °C. At lower temperature put the can into warm water (max. T=40 °C) for about 20 minutes. Before use shake can thoroughly (about 20 times) with the valve upside down. Remove the protective cap and screw the adapter. Hold the can upside down and activate the foam by pressing the valve. Gaps should be filled only partially, as the foam expands 2 - 3 times its original volume. If you are filling a gap wider than 5 cm, work in layers. Apply the second layer once the first one has hardened.
You can speed up the process of hardening by spraying the foam with water. Once the foam has hardened, cut it with a sharp knife and finish with plastering, covering, painting ... If you do not use the entire can, clean the valve with the TEKAPUR cleaner or acetone. Hardened foam can be removed with the APURSIL cleaner or mechanically. Cured foam must be protected against UV.
Gun grade foam
Surfaces should be clean, free of dust, grease and other impurities. Dry and porous surfaces should be moistened with water. The optimal temperature of can at work is 20 - 25 °C. At lower temperature put the can into warm water (max. T=40 °C) for about 20 minutes. Before use shake can thoroughly with the valve upside down and screw it onto the gun. Press the trigger and let the foam flow through (cca. 2 seconds). This fills the foam into the extension tube. The pistol is now ready for use.
During foam application hold the pistol with the can in vertical position. The output of the foam can be regulated with the trigger and controlled with the adjustment screw on the back side of the gun. When replacing the can, shake the new can vigorously, unscrew the empty can and immediately replace it with new foam can. The can replacement has to be fast to prevent that PU-foam can harden in the adapter. Hardened PU residues in front of the nozzle can be removed only mechanically.
At short work interruptions (less than 48 hours) the can can be left screwed onto the gun, but screw on the back side of the gun must be tightened. The can must be under pressure, otherwise the foam will harden in the gun. At longer work interruptions, clean the gun with the TEKAPUR cleaner. It should be considered that the foam would expand 30 - 50 %. If you are filling a gap wider than 5 cm, work in layers. Apply the second layer once the first one has hardened. You can speed up the process of hardening by spraying the foam with water. Once the foam has hardened, cut it with a sharp knife and finish with plastering, covering, painting ... If you do not use the entire can, clean the valve with the TEKAPUR cleaner or acetone. Hardened foam can be removed with the APURSIL cleaner or mechanically. Cured foam must be protected against UV.
How to store polyurethane foam?
- In dry place (0 °C to 20 °C),
- higher temperatures shorten storage life,
- can must be in vertical position.
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