kinds of shape for the heater U,W,I,L,U-right highest temperature could reach 1800C parts of high temp ... 1800 degreesduring oxidizing atmosphere.* Dia. 3,4,6,7,9,10,12,18,24* Temp: 1000-1800 celsius degrees* Used in the ... under the strong oxidizing function in the low temperature. 1800 U type mosi2 electric heater