Product Overview: The test device ???? meet UL-1581 heat distortion test requirements. Required with the use of aging box. The device is provided with a tray, you can add as needed to fill weights corresponding weight. ? The main parameters: 1, the pressure on the upper end of the rod diameter: Φ19mm 2, put pressure on the lower end of the rod diameter: Φ9.5mm 3, put pressure on the total weight of the rod: 250g 4, station: 5 groups