Furan mortars application

Another seven days cure is recommended at this point, if this is possible. However, if down time is vital, this may be reduced to an absolute minimum of three days at 70°F. After the cure time has elapsed, a final overall application of the furan mortar, V32" to Vs" thick, is trowelled to as uniform a surface as possible. 

However, until recently, the principal application of polyurethanes has been as in situ-polymerized rigid and flexible foams used for insulation and cushioning, respectively.— — Unlike the phenolic, urea and furan mortars, in which the high polymer formation is the result of the chain extension and crosslinking of a prepolymer, the final polyurethane product is the result of a reaction between hydroxyl and isocyanate groups as shown by the following equation ... 

Bricklayer s Method. Acid-resistant brick linings are used where immersion in highly corrosive chemicals is involved or where severe thermal shock conditions exist. Furan resins have been used for years for such applications. As with the furan grouts previously discussed, a number of companies manufacture and market furan mortar systems for acid-resistant brick linings. Most, if not all, of these companies also install the complete lining system. 

Morrill Act of 1862, 24 353 Mortality studies, PCB-related, 13 141 Mortar cements, 5 500t Mortars, 5 467, 500t 21 482-483 citric acid application, 6 648 furan resins in, 12 274 slaked lime in, 15 64 Mortar substitute, sulfur coatings as, 23 593... 

It is important to point out that in spite of the ease of use, these resinous mortars, like many other chemical compositions, are toxic and adequate precautions must be taken to protect the health of the applicators. For example, the skin should be protected from the setting agents used in phenolic, urea, furan, and epoxy cements and adequate ventilation should be provided during the application of polyurethane and polyester cements to prevent the inhalation of volatile isocyanates and styrene respectively. However, once they are cured, these resinous cements are not hazardous. Actually, they are important energy conserving materials of construction. 

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