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Dilutec explains that, when producing a tool, it is necessary to use special gelcoats that are at least capable of withstanding the constant reaction of styrene present in the resin, in addition to having high thermal stability and good mechanical strength.
It says that a good mould is essential for producing a quality piece made of composite materials. “This type of gelcoat should withstand multiple mould release cycles, which means to resist the constant polymerisations of styrene and the consequent changes in temperature. In addition, this product must withstand twists and small impacts without warping, cracking or losing its gloss,” said Marcos Brambilla, Technical Manager of Dilutec.
According to Brambilla, when you manufacture a mould, the main goal is to achieve the highest possible gloss, so that the pieces produced have a perfect finish and do not require rework. “The cost of manufacturing a tool is much higher than the tool itself, hence why it is necessary to be careful when selecting the raw materials.”
Brambilla comments on two of Dilutec’s gelcoats, which he claims are ideal for manufacturing moulds: Colorgel ISO and Colorgel Hard Shine, “Both are specialty resin-based products, and Colorgel Hard Shine features a blend of vinyl ester polymers in its formulation, which ensures even higher chemical resistance levels.” To decide which one to use, Dilutec says the moulder must take into account a few aspects such as the peculiarities of the manufacturing process of the pieces, tool effort and the desired type of finish.
“The gelcoats for moulds produced by Dilutec stand out for their easy application and excellent coverage, in addition to the high levels of resistance to chemicals and solvents. They also ensure improved gloss for a long time, which reduces the need for rework,” said Brambilla.
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