The Basic Requirements of Electric Heating Tube for Sealing Material
As the sealing material of electric heating tube, it should have the following basic requirements:
(1) The material itself has a high degree of insulation and electrical strength.
(2) It has good sealing performance—water tightness and air tightness. The best sealing performance is elastic sealing.
(3) It has a similar thermal expansion coefficient to the conductive lead-out rod and the metal seamless sheath tube.
(4) High heat resistance.
(5) Low hygroscopicity.
(6) Under working temperature, it will not aging even long-term work.
(7) Wide source of materials and low price.
(8) Simple making process, convenient operation, and it is suitable for mass production or flow production.