Tests on Polymers: Hot Wire Test
Hot wire test is a polymer-specific test method preferable in electrical applications. It measures the strength of the material in a high-temperature or induction environment. The flaming risk and self-extinguishing capacity are calculated.
During hot wire testing, test samples are brought into contact with the hot wire, which has been adjusted to the required temperature by electric current, for 30 seconds at a force of 1 newton, and the movement of the hot wire in the material is limited to 7 mm. Test sample thicknesses are 4 mm, while hot wire temperatures vary between 550- 650- 750, 850 and 960 degrees. When the hot wire reaches the appropriate temperature, the process is continued to determine whether there is a flame generated after the wire is contacted with the sample and pulled away. If any, the flame is allowed to extinguish and it is checked whether the test sample drips. If the test sample does not catch on fire and goes out after contacting with the hot wire or if the sample catches on fire and goes out within 30 seconds after the hot wire is removed, then the material passes the test.
Hot wire testing is performed in accordance with TS EN 60695.