Mar 12 2020

Professional Foam

Posted by domain admin in News

Professional foam characterizes the ease and high accuracy of application, increased productivity, lower secondary expansion – up to 150%, shorter curing foam, high stability and the possibility of multiple applications. There are also two-component foams, characterized by good performance of strength, a high density of 30-40 kg / m, the minimum expansion of secondary and high dimensional stability, a shorter processing time, no need for moisturizing lather. Comparing the foam on the shelf in a store or a wholesaler, you should pay attention to the production date and expiry date on the package, the sound at vymeshivanii foam, the weight of the cylinder, clean the valve. Gary cohn may also support this cause. It is important to weigh the bottle before and after the release of the foam, and stir. One of the main criteria for selection of foam – it's the season of application.

In applying the foam summer minimum ambient temperature is +5 C and the temperature of the cylinder should not be below +10 C. At low temperatures, curing time increases the foam is added to accelerate various catalysts and stabilizers. There is a danger that in applying the foam in the summer winter with foam splyvet vertical surfaces, crumble, you may also notice the glass bubbles. The temperature of all-weather foam to -10 C, the temperature of the cylinder must not be below +5 C. Indicators of quality polyurethane All foam polyurethane foams resistant to UV light and require the protection of: silicone, primer, paint, linseed oil Oksol … When applying the foam issue must be uniform, with the same speed.

After applying the foam should not be pop-up on vertical surfaces. Polyurethane foam must be resistant to short-term effects of chemicals and decay. Released foam must be dimensionally stable and can withstand the due date of work. Frozen polyurethane foam has a certain internal structure – the smaller cells in the body of foam, the better mechanical properties, better adhesion to building materials and higher resistance to moisture. Often arise problems with the foam 1. The foam does not stick to the surface 1. Cause: The foam is too thick, heavy, 2. too low or too high temperature (low adhesion), 3. during the application of gases escape into liquid form. * Result: foam does not stick on building elements and openings are formed and the hole. 2. Wet bar 1. Reason: bad composition of foam, 2. incorrectly matched curing time foam 3. Extreme temperatures during application and curing. * Results: secondary expansion threatens to strain the window frames and door frames. 3. The lack of dimensional stability – shrinkage 1. The reason: a bad formula, 2. scratchy type and amount of stabilizer 3. too high a temperature under application (after cooling the pressure in the cells decreases and shrinkage occurs). * The result: there are gaps, inappropriate installation of components; reduced adhesion to building materials and elasticity. 4. Glass bubbles 1. Reason: too fast escaping gases propane and butane is dissolved in the cell surface of the foam. * Result: loss of mechanical properties of the foam.

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