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November
Civil engineering students must work together in areas such as EPS mold designs, concrete mixes and, of course, their paddle skills for the big day. All teams, from countries including the U.S and Canada, submit detailed plans for all aspects of the build. This includes the precise canoe shape that demands a precise mold shape.
At the same time, air permeates into the interior of the cell through the cell membrane, so that the pressure in the cell is balanced with the external pressure. This will make the beads after the pre-expansion elastic. During the ripening storage process, the foaming agent also diffuses outward at the same time, so the shelf life of the beads after the pre-expansion cannot be too long.
A-grade fireproof EPS insulation board continues the traditional EPS foam board with small thermal conductivity and large heat storage coefficient. It is better than the inorganic thermal insulation mortar and foam glass on the market.
The temperature of one atmospheric pressure is close to the softening point of polystyrene (100 ℃) – the speed of steam entering into EPS beads is faster than that of foaming agent diffusing EPS beads
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