ABSTRACT
Faults encountered when hand-casting polyurethanes can often be a result of one or more problems. A complete review must be carried out when solving any irregularities. When defects appear in products that previously were good, it may be the interaction of several factors. The weather may have changed, affecting the dew point. This may cause moisture to condense on the reinforcings. A second effect is the processing temperatures becoming too low. Table 6.1 indicates some general causes of problems.
