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June 22, 2025
In most practical cases, the thermal expansion and contraction allowance of polycarbonate sheets during installation is within the range of 50℃, and the thermal expansion and contraction per meter is about 3mm. For example, the thermal expansion and contraction of a panel with a width of 1.00m and a length of 1.50m is 3mm in the width direction and about 5mm in the length direction. We recommend that you consider the actual situation and double the allowance when calculating it, and consider half of the allowance at both ends of the panel.
The linear expansion coefficient of the polycarbonate sheets is that for every 1 degree Celsius increase in temperature, a 1m*1m panel expands by about 0.0675mm in length and width. Correspondingly, for every 1 degree Celsius decrease in temperature, the panel shrinks by the same amount. Large spacing means large cumulative thermal expansion length, and insufficient reserved space; small spacing will inevitably severely restrict the movement of the panel, causing too much stress concentration. If it is allowed to bend outward during thermal expansion, some stress can be offset. Usually, when drilling holes in polycarbonate sheets, the hole spacing is more appropriate at 50cm, and the distance between the hole and the edge of the panel is recommended to be more than 3~5cm.
