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Scientists' hi-tech paint keeps steel beams from melting

Antibacterical coatings for door handles, graffiti proof linings for outdoor spaces and paint powder that stops steel framing collapsing in fires are among the clever coatings being developed by scientists at Callaghan Innovation.

A team of 23 scientists and engineers receive requests from 40 to 50 companies each year, mostly looking for solutions to problems they face.

Group Manager Conrad Lendrum said typically they received requests from a company when something failed and people wanted to know why.

Once they help a client work that out, the company often returns with a product development or improvement.

Mr Lendrum said Callaghan's team worked with companies to improve their material choices, find new materials, reduce costs and improve performance.

In one recent case, they spent over a year working with a paint company to develop a fire-resistant coating known as an intumescent coating.

"In a fire, wooden structures are pretty good in that the wood chars and that black charring slows the combustion processes down, gives people time to get out of the building before it collapses," Mr Lendrum said.

"With conventional steel framing if you don't coat it, then the steel quickly gets to a temperature where it can no longer support its own weight and then it collapses.

"It's not burning per se, but it's softening."

The paint company sent its researcher and equipment to Callaghan. They built a furnace and the two sets of scientists collaborated for 15 months to develop the product.

The intumescent paint can be used in buildings as a passive fire resistance measure - applied to structural beams or pillars as an aesthetically pleasing coating.

The paint expands significantly when exposed to high temperatures, such as those in a fire. As the coating expands, it becomes much less dense, which means it act as an insulator against the high temperatures.

"That paint coating in a fire goes through a series of chemical reactions to expand, char and blow up into a thick foam that provides a thermal barrier to insulate the steel.

"So the idea is that will keep the steel below 500 degrees, long enough for the people to get out," Mr Lendrum said.

The paint company still has a few hurdles to cross, but is working on bringing the product to market soon.


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