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VYCOM NOTE! When using radiant heaters, be careful not to overheat the surface. If the HDPE material is over 5/32” thick, both sides of the sheet should be heated (Figure 3b). When heating from only one side, the top heater should be set at 750°F or below. With two-sided heating, the top heater should be at 750°F and the bottom heater at 650°F. If using an air-circulated oven, the temperature should be between 260°F and 280°F. After the material is heated, place it immediately into the mold. The male mold should have a draft angle of at least 5 degrees. Depending upon the part, the material may need to be larger than the mold to allow for shrinkage or clamping. Vacuum Forming Figure 3b Vacuum forming HDPE is similar to pressure forming except that it is generally used when greater part detail and dimensional repeatability are necessary. The forming temperature for HDPE is also higher, generally 300°F to 340°F. Exceeding 340°F is not recommended because it can cause bubbling of the material surface. Molds for vacuum forming are generally made of wood or plaster for short life short runs and of nonferrous metals for long life long runs. For metals, aluminum is generally the material of choice. Molds should be designed with radii at least two times the material thickness and draft angles of 5° or greater. Vacuum holes should not exceed 1/32” in diameter. www.vycomplastics.com 14PDF Image | FABRICATION MANUAL HDPE
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